Yokosawa Koichi

Faculty of Health Sciences　Health Sciences　Health SciencesProfessor
Research Institute for Electronic Science　Research Center of Mathematics for Social CreativityProfessor
Center for Human Nature Artificial Intelligence and NeuroscienceProfessor
Last Updated :2026/04/14

■Researcher basic information

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J-Global ID

Research Keyword

  • 脳磁界
  • 脳情報
  • 情報処理
  • 認知機能

Research Field

  • Life sciences, Biomaterials
  • Life sciences, Biomedical engineering

Educational Organization

■Career

Committee Memberships

  • Apr. 2016 - Present
    日本生体医工学会, 編集委員長, Society

■Research activity information

Awards

  • Sep. 2016, 日本生体医工学会, Best Research Award　　　　　　　　　　　　　　　
    Alpha-band amplitude during memory encoding is an index of memory performance
    Koichi Yokosawa
  • Sep. 2015, 日本生体医工学会, ベストリサーチアワード　　　　　　　　　　　　　　　
    聴覚性定常脳磁界応答の音楽的期待による変調
    横澤宏一

Papers

  • Difference in Mentalizing Function Between Face-To-Face and Online Communications
    Joohyeong Kim, Hayato Watanabe, Koichi Yokosawa
    IFMBE Proceedings, 01 Jun. 2024, [Peer-reviewed]
    English
  • Brain activity supporting alternating speech for semantic words: simultaneous magnetoencephalographic recording
    Risa Anada, Hayato Watanabe, Atsushi Shimojo, Hideaki Shiraishi, Koichi Yokosawa
    Cerebral Cortex, 34, 2, 1, 12, 31 Jan. 2024, [Peer-reviewed]
    English, Scientific journal
  • Magnetoencephalography Hyperscanning Evidence of Differing Cognitive Strategies Due to Social Role During Auditory Communication
    Nano Yoneta, Hayato Watanabe, Atsushi Shimojo, Kazuyoshi Takano, Takuya Saito, Kazuyori Yagyu, Hideaki Shiraishi, Koichi Yokosawa, Jared Boasen
    Frontiers in Neuroscience, 16, 790057, 790057, 02 Aug. 2022, [Peer-reviewed], [International Magazine]
    English, Scientific journal, Auditory communication is an essential form of human social interaction. However, the intra-brain cortical-oscillatory drivers of auditory communication exchange remain relatively unexplored. We used improvisational music performance to simulate and capture the creativity and turn-taking dynamics of natural auditory communication. Using magnetoencephalography (MEG) hyperscanning in musicians, we targeted brain activity during periods of music communication imagery, and separately analyzed theta (5-7 Hz), alpha (8-13 Hz), and beta (15-29 Hz) source-level activity using a within-subjects, two-factor approach which considered the assigned social role of the subject (leader or follower) and whether communication responses were improvisational (yes or no). Theta activity related to improvisational communication and social role significantly interacted in the left isthmus cingulate cortex. Social role was furthermore differentiated by pronounced occipital alpha and beta amplitude increases suggestive of working memory retention engagement in Followers but not Leaders. The results offer compelling evidence for both musical and social neuroscience that the cognitive strategies, and correspondingly the memory and attention-associated oscillatory brain activities of interlocutors during communication differs according to their social role/hierarchy, thereby indicating that social role/hierarchy needs to be controlled for in social neuroscience research.
  • Construction of a fiber-optically connected MEG hyperscanning system for recording brain activity during real-time communication.
    Hayato Watanabe, Atsushi Shimojo, Kazuyori Yagyu, Tsuyoshi Sonehara, Kazuyoshi Takano, Jared Boasen, Hideaki Shiraishi, Koichi Yokosawa, Takuya Saito
    PloS one, 17, 6, e0270090, 2022, [International Magazine]
    English, Scientific journal, Communication is one of the most important abilities in human society, which makes clarification of brain functions that underlie communication of great importance to cognitive neuroscience. To investigate the rapidly changing cortical-level brain activity underlying communication, a hyperscanning system with both high temporal and spatial resolution is extremely desirable. The modality of magnetoencephalography (MEG) would be ideal, but MEG hyperscanning systems suitable for communication studies remain rare. Here, we report the establishment of an MEG hyperscanning system that is optimized for natural, real-time, face-to-face communication between two adults in sitting positions. Two MEG systems, which are installed 500m away from each other, were directly connected with fiber optic cables. The number of intermediate devices was minimized, enabling transmission of trigger and auditory signals with almost no delay (1.95-3.90 μs and 3 ms, respectively). Additionally, video signals were transmitted at the lowest latency ever reported (60-100 ms). We furthermore verified the function of an auditory delay line to synchronize the audio with the video signals. This system is thus optimized for natural face-to-face communication, and additionally, music-based communication which requires higher temporal accuracy is also possible via audio-only transmission. Owing to the high temporal and spatial resolution of MEG, our system offers a unique advantage over existing hyperscanning modalities of EEG, fNIRS, or fMRI. It provides novel neuroscientific methodology to investigate communication and other forms of social interaction, and could potentially aid in the development of novel medications or interventions for communication disorders.
  • 小児脳波・脳磁図研究の最前線 脳磁図の最前線;コミュニケーション脳科学とDual MEG
    柳生 一自, 渡辺 隼人, 高野 一義, 下條 暁司, 白石 秀明, 横澤 宏一, 齊藤 卓弥
    臨床神経生理学, 48, 5, 440, 440, (一社)日本臨床神経生理学会, Oct. 2020
    Japanese
  • Functional decline of the precuneus associated with mild cognitive impairment: Magnetoencephalographic observations
    Koichi Yokosawa, Keisuke Kimura, Ryoken Takase, Yui Murakami, Jared Boasen
    PLOS ONE, 15, 9, e0239577, e0239577, Public Library of Science (PLoS), 28 Sep. 2020, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal, 31768187
  • Semi-automated brain responses in communication: A magnetoencephalographic hyperscanning study
    Kazuyoshi Takano, Hayato Watanabe, Kazuyori Yagyu, Atsushi Shimojo, Jared Boasen, Yui Murakami, Hideaki Shiraishi, Koichi Yokosawa, Takuya Saito
    2020 42nd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC), 2020, 2893, 2896, IEEE, Jul. 2020, [Peer-reviewed], [Corresponding author], [International Magazine]
    English, International conference proceedings, Face to face communication is interactive, and involves continuous feedforward and feedback of information, thoughts, and feelings to the opposite party. To accurately assess the neural processing underlying these interactions, synchronous and simultaneous recording of the brain activity from both parties is needed, a method known as hyperscanning. Here, we investigated the neural processing underlying nonverbal face-to-face communication using a magnetoencephalographic (MEG) hyperscanning system, comprising two fiber optically connected MEGs. Eight pairs of subjects participated. Each individual in each pair viewed a combined 80 randomized 20 s trials of 40 real-time and 40 recorded (hereafter, real and simulated, respectively) videos of the opposite party's face. Non-verbal communication through actions such as gaze, eye blinks, and facial expression was intrinsically only possible during real videos. After each trial, subjects individually subjectively discriminated whether the viewed video was real or simulated. Overall subjective discrimination accuracies were slightly but significantly above chance level. Statistical analysis of brain activity revealed a significant three way interaction between theta-band rhythm amplitude, video type, and subjective discrimination response in the right frontal cortex. Additionally, when subjects responded that videos were simulated, theta activity was significantly lower for real videos compared with simulated videos (p = 0.01). This result not only demonstrates the importance of right frontal theta activity during non-verbal communication, but also indicates the existence of unconscious, semi-automated neural processing during non-verbal communication that underlies one's ability to subjectively discriminate whether or not the opposite party is real., 31768172
  • The Development of Sensitivity to Tonality Structure of Music: Evidence from Japanese children raised in a simultaneous and unbalanced bi-musical environment
    Rie Matsunaga, Pitoyo Hartono, Koichi Yokosawa, Jun-ichi Abe
    Music Perception, 37, 3, 225, 239, University of California Press, 01 Feb. 2020, [Peer-reviewed]
    Scientific journal, Tonal schemata are shaped by culture-specific music exposure. The acquisition process of tonal schemata has been delineated in Western mono-musical children, but cross-cultural variations have not been explored. We examined how Japanese children acquire tonal schemata in a bi-musical culture characterized by the simultaneous, and unbalanced, appearances of Western (dominant) music along with traditional Japanese (non-dominant) music. Progress of this acquisition was indexed by gauging children’s sensitivities to musical scale membership (differentiating scale-tones from non-scale-tones) and differences in tonal stability among scale tones (differentiating the tonic from another scale tone). Children (7-, 9-, 11-, 13-, and 14-year-olds) and adults judged how well two types of target tones (scale tone vs. non-scale tone; tonic vs. non-tonic) fit a preceding Western or traditional Japanese tonal context. Results showed that even 7-year-olds showed sensitivity to Western scale membership while sensitivity to Japanese scale membership did not appear until age nine. Also, sensitivity to the tonic emerged at age 13 for both types of melodies. These results suggest that even though they are exposed to both types of music simultaneously from birth, Japanese children begin by acquiring the tonal schema of the dominant Western music and this age of acquisition is not delayed relative to Western mono-musical peers.
  • Overview of Magnetoencephalography—Brief History of its Sensors and Hardware
    Koichi Yokosawa
    Advanced Biomedical Engineering, 9, 0, 217, 224, Japanese Society for Medical and Biological Engineering, 2020, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • Different roles for theta- and alpha-band brain rhythms during sequential memory
    Ryoken Takase, Jared Boasen, Koichi Yokosawa
    2019 41st Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC), IEEE, Jul. 2019, [Peer-reviewed], [Last author, Corresponding author]
    International conference proceedings
  • リアルタイムコミュニケーションを計測するためのdual MEGシステムの構成　　　　　　　　　　　　　　　
    渡辺 隼人, 下條 暁司, 柳生 一自, 曽根原 剛志, 白石 秀明, 横澤 宏一, 齊藤 卓弥
    日本生体磁気学会誌, 32, 1, 158, 159, 日本生体磁気学会, 2019
    Japanese
  • Differences in Regional Brain Activities during Memory Acquisition Depending on Individual Working Memory Capacity
    Hong-Seng Gan, Tatsuya Suzuki, Koichi Yokosawa, Yumie Ono
    Advanced Biomedical Engineering, 8, 23, 29, Japanese Society for Medical and Biological Engineering, 2019
    Scientific journal
  • 脳磁計（MEG）の50年　　　　　　　　　　　　　　　
    横澤宏一
    生体医工学, 57, 4-5, 113, 118, 2019, [Invited], [Lead author]
    Japanese
  • Appearance and modulation of a reactive temporal-lobe 8–10-Hz tau-rhythm　　　　　　　　　　　　　　　
    Koichi Yokosawa, Yui Murakami, Hiroaki Sato
    Neuroscience Research, 2019, [Peer-reviewed], [Lead author, Corresponding author]
    English, Scientific journal
  • Turning a cylindrical treadmill with feet: An MR-compatible device for assessment of the neural correlates of lower-limb movement
    Akira Toyomura, Koichi Yokosawa, Atsushi Shimojo, Tetsunoshin Fujii, Shinya Kuriki
    Journal of Neuroscience Methods, 307, 14, 22, Elsevier BV, Sep. 2018, [Peer-reviewed], [International Magazine]
    English, Scientific journal, BACKGROUND: Locomotion, which is one of the most basic motor functions, is critical for performing various daily-life activities. Despite its essential function, assessment of brain activity during lower-limb movement is still limited because of the constraints of existing brain imaging methods. NEW METHOD: Here, we describe an MR-compatible, cylindrical treadmill device that allows participants to perform stepping movements on an MRI scanner table. The device was constructed from wood and all of the parts were handmade by the authors. RESULTS: We confirmed the MR-compatibility of the device by evaluating the temporal signal-to-noise ratio of 64 voxels of a phantom during scanning. Brain activity was measured while twenty participants turned the treadmill with feet in sync with metronome sounds. The rotary speed of the cylinder was encoded by optical fibers. The post/pre-central gyrus and cerebellum showed significant activity during the movements, which was comparable to the activity patterns reported in previous studies. Head movement on the y- and z-axes was influenced more by lower-limb movement than was head movement on the x-axis. Among the 60 runs (3 runs × 20 participants), head movement during two of the runs (3.3%) was excessive due to the lower-limb movement. COMPARISON WITH EXISTING METHODS: Compared to MR-compatible devices proposed in the previous studies, the advantage of this device may be simple structure and replicability to realize stepping movement with a supine position. CONCLUSIONS: Collectively, our results suggest that the treadmill device is useful for evaluating lower-limb-related neural activity.
  • Speech Disfluency-dependent Amygdala Activity in Adults Who Stutter: Neuroimaging of Interpersonal Communication in MRI Scanner Environment
    Akira Toyomura, Tetsunoshin Fujii, Koichi Yokosawa, Shinya Kuriki
    Neuroscience, 374, 144, 154, Elsevier Ltd, 15 Mar. 2018, [Peer-reviewed]
    English, Scientific journal
  • フィンランドの教育 そのしくみと成果　　　　　　　　　　　　　　　
    横澤宏一
    臨床検査学教育, 11, 1, 38, 41, 2018, [Invited], [Lead author]
    Japanese
  • A cross-culture comparison of tonality perception in Japanese, Chinese, Vietnamese, Indonesian, and American listeners
    R. Matsunaga, T. Yasuda, M. Johnson-Motoyama, P. Hartono, K. Yokosawa, J. Abe
    Psychomusicology: Music, Mind, and Brain, 28, 3, 178, 188, American Psychological Association (APA), 2018, [Peer-reviewed]
    English, Scientific journal
  • Multiple Brain Activities during Sequential Memory Encoding ―MEG Study of Modulation of Alpha-band Rhythm　　　　　　　　　　　　　　　
    Koichi Yokosawa, Ryoken Takase, Ryota Chitose, Keisuke Kimura
    Conference proceedings of IEEE Engineering in Medicine and Biology Society (EMBS), 5, 8, 2018, [Peer-reviewed], [Lead author, Corresponding author]
    English, International conference proceedings
  • Spectral-spatial Differentiation of Brain Activity during Mental Imagery of Improvisational Music Performance using MEG　　　　　　　　　　　　　　　
    Jared Boasen, Yuya Takeshita, Shinya Kuriki, Koichi Yokosawa
    Frontiers in Human Neuroscience, 12, Article 156, 2018, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal
  • Fluctuation of Lower Limb Movement in the MRI Bore: Different Contributions of the Cortical and Subcortical Locomotor Regions
    Akira Toyomura, Koichi Yokosawa, Shinya Kuriki
    Advanced Biomedical Engineering, 6, 15, 20, Japanese Society for Medical and Biological Engineering, 2017, [Peer-reviewed]
    English, Scientific journal,

    Bipedal locomotion requires an automatic process for rhythmic motor generation, as well as volitional and precise motor control for purposeful action. The neural substrates for these two distinct locomotion controls in humans are still unclear. This functional magnetic resonance imaging (MRI) study investigated the neural activity of the locomotor-related brain regions along with participants' lower limb behavior. Participants lay face-up in the MRI bore and moved their legs up and down at the knees under two conditions. Under the non-obstacle condition, they moved their legs while watching a point-of-view video that showed walking straight along a corridor at a constant speed. On the other hand, under the obstacle condition, the point-of-view video showed walking while avoiding obstacles in the passage. Two white markers were pasted on the soles of the participants' feet and images were captured by a video camera throughout the experiment to track the participants' lower limb movements. The horizontal fluctuation of lower limb movement was extracted offline. We assumed that the horizontal fluctuation reflected participants' volitional behavior of lower limb movement. The results showed that the obstacle condition elicited greater fluctuation of lower limb movement compared to the non-obstacle condition, and elicited brain activation in wider areas including the parietal and occipital lobes compared to the non-obstacle condition. The involvement of the parietal and occipital lobes in volitional control is consistent with findings of previous animal studies. In a correlation analysis between the signal change extracted from the locomotor-related cortical/subcortical regions and the horizontal fluctuation of the feet, activities in the cortical motor areas (primary motor cortex, premotor cortex, and supplementary motor area) showed weak but significant correlation with the fluctuation of lower limb movement. Activities in the cerebellar and mesencephalic locomotor regions showed no significant correlation, but almost constant activation irrespective of fluctuation of the lower limbs. These results suggest that the parietal, occipital cortices, and cortical motor areas are involved in volitional control.

  • 絶食は情動的画像に対する生理的・心理的反応を変化させるか 脳磁計、VAS、末梢生理学的マーカーによる解析(Does Fasting Modulate Physio-Psychological Responses to Emotional Pictures? An Analysis by MEG, VAS and Peripheral Physiological Markers)
    Mizobe Kayo, Yokosawa Koichi, Shimojo Atsushi, Ozaki Michitaka
    Advanced Biomedical Engineering, 5, 88, 93, (公社)日本生体医工学会, Dec. 2016, [Peer-reviewed], [Corresponding author]
    English, Scientific journal, ストレスが身体機能に与える影響を評価することを目的に、健常者20名(平均21.3±1.3歳)に情動的快・中性・不快な画像刺激をランダムに呈示した際の主観的評価(VAS)、脳磁図、脈拍数、酸素飽和度(SpO2)を計測した。平常時に実験を行った被験者を対照群、12〜15時間絶食した状態で実験を行った被験者を絶食群とした。20名のうち、3名の脳磁図は信号源が特定できなかったため除外し、17名を分析対象とした。その結果、顕著な振幅変化が初期ステージ(画像提示後0.5〜1.75秒)に見られた。対照群ではα帯域律動が中性画像よりも快・不快画像で有意に抑制され、絶食群では快画像より不快画像でα帯域律動が有意に抑制された。絶食時には快画像に対する応答の低下がみられたことから、絶食時は情動的刺激に対する感受性が変化する可能性があることが示された。
  • Evaluation of brain activity of lower limb movement using MRI-compatible equipment
    Toyomura Akira, Yokosawa Koichi, Shimojo Atsushi, Fujii Tetsunoshin, Kuriki Shinya
    Transactions of Japanese Society for Medical and Biological Engineering, 54, 27, S199, S199, Japanese Society for Medical and Biological Engineering, 2016
    Japanese,

    ヒトの二足歩行に関する神経基盤は，主に計測上の制約からこれまで研究が進んでいない．本研究ではまず，MRI環境で使用可能な非磁性下肢運動装置を開発した．次に，ファントムを用いて，fMRIで用いられる高速撮像法において画像への影響がほとんど見られないことを，装置無し，装置静止時，および装置稼動時の比較によって確認した．次に，MRI内に被験者を入れて実際に計測を試みた．レスト時と下肢運動課題時を比較した場合，足の領域に相当する運動野背側部の領域が広く活動することが観察された．本装置はヒトの下肢運動に関する神経基盤の研究を始め，リハビリテーションの評価などに使用可能であると考えられる．

  • Alpha-band Rhythm Suppression during Memory Recall Reflecting Memory Performance
    Koichi Yokosawa, Keisuke Kimura, Ryota Chitose, Takuya Momiki, Shinya Kuriki
    2016 38TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), 4539, 4542, 2016, [Peer-reviewed], [Lead author, Corresponding author]
    English, International conference proceedings
  • Alpha-band Amplitude During Memory Encoding Is an Index of Memory Performance
    Koichi YokosawaKeisuke Kimura, Ryota Chitose, Koichi Yokosawa
    Advanced Biomedical Engineering, 5, 43, 48, Japanese Society for Medical and Biological Engineering, 2016, [Peer-reviewed], [Last author, Corresponding author]
    English, Scientific journal, Alpha-band (8–13 Hz) rhythm during encoding of sequentially presenting memory items was recorded using a 76-channel magnetoencephalograph. In a memory task, seven images each with an arrow pointing up, down, left or right were presented sequentially. Thereafter, a recall number was presented. Each participant memorized the arrow directions in the order of presentation and recalled the direction of the arrow for the recall number, and responded by pressing a button. Each participant also took part in a control task, in which the participant looked at the same images as those in the memory task but pressed the button previously instructed. Ten right-handed male volunteers performed 280 epochs of the memory task and 120 epochs of control task. The amplitudes of alpha-band rhythm during presentation of midterm (3rd–5th) items were compared with those of beginning (1st and 2nd) items. Fifteen sensors showed significant differences (midterm > beginning) in the memory task (0.01 < p < 0.05 at 11 sensors, 0.001 < p < 0.01 at 4 sensors), while no sensors showed a significant increase in the control task. Using the statistical parametric mapping (SPM) method, the region of increase in alpha-band rhythm from beginning to midterm was estimated to be located in the visual cortex and around bilateral temporal gyri. Additionally, the increase in amplitude from beginning to midterm was significantly greater before a correct answer than before a wrong answer (0.01 < p < 0.05 at 7 sensors and p < 0.001 at 1 sensor). Previous works demonstrated that alpha-band rhythm is increased by active inhibition of visual inputs that are irrelevant to memory. The region of increase estimated to be in the visual cortex agrees with previous works. An interpretation of our results is that since irrelevant visual inputs are successfully inhibited before a correct answer, the amplitude of alpha-band rhythm increases more than that before a wrong answer. These results indicate the possibility that alpha-band amplitude during memory encoding can be used as an index of memory performance.
  • Modulation of auditory steady-state responses caused by musical expectancy
    Yuya Takeshita, Tomoka Kadoya, Keisuke Kimura, Rie Matsunaga, Shinya Kuriki, Koichi Yokosawa
    Transactions of Japanese Society for Medical and Biological Engineering, 53, 2, 84, 89, Japan Soc. of Med. Electronics and Biol. Engineering, 01 Jun. 2015, [Peer-reviewed]
    English, Scientific journal
  • シーケンシャル記憶課題の記銘時におけるα波帯域脳律動の変調メカニズム　　　　　　　　　　　　　　　
    千年涼太, 山路萌, 栗城眞也, 横澤宏一
    電子情報通信学会技術報告, 114, 514, 177, 182, Mar. 2015
  • リズム変化音列に対する脳磁界応答　　　　　　　　　　　　　　　
    竹下悠哉, 田村菜月, 横澤 宏一
    電子情報通信学会技術報告, 114, 514, 377, 380, Mar. 2015
  • Acoustic pressure reduction at rhythm deviants causes magnetoencephalographic response.
    Yuya Takeshita, Koichi Yokosawa
    2015 37TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), 6650, 6653, 2015, [Peer-reviewed], [Last author, Corresponding author]
    English, International conference proceedings
  • Activity in the Left Auditory Cortex is Associated with Individual Impulsivity in Time Discounting.
    Ruokang Han, Taiki Takahashi, Akane Miyazaki, Tomoka Kadoya, Shinya Kato, Koichi Yokosawa
    2015 37TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), 6646, 6649, 2015, [Peer-reviewed], [Last author, Corresponding author]
    English, International conference proceedings
  • Magnetic Displacement Force and Torque on Dental Keepers in the Static Magnetic Field of an MR Scanner
    Mika Omatsu, Takayuki Obata, Kazuyuki Minowa, Koichi Yokosawa, Eri Inagaki, Kinya Ishizaka, Koichi Shibayama, Toru Yamamoto
    JOURNAL OF MAGNETIC RESONANCE IMAGING, 40, 6, 1481, 1486, Dec. 2014, [Peer-reviewed]
    English, Scientific journal
  • Measurement of neural activity during face-to-face vocal communication
    Akira Toyomura, Tetsunoshin Fujii, Koichi Yokosawa, Shinya Kuriki
    Transactions of Japanese Society for Medical and Biological Engineering, 52, 157, O-158, Japan Soc. of Med. Electronics and Biol. Engineering, 17 Aug. 2014, [Peer-reviewed]
    Japanese, Scientific journal
  • 絶食ストレス下における情動刺激に伴う生理的・心理的変化 快・不快画像による脳磁図・脈拍・呼吸・主観的評価の比較
    溝部 佳代, 横澤 宏一, 澤部 祐貴, 太田 早紀, 河村 優生, 半谷 早紀枝, 下條 暁司, 尾崎 倫孝
    日本生体磁気学会誌, 27, 1, 160, 161, 日本生体磁気学会, May 2014
    Japanese
  • 音楽的旋律の期待による聴覚性定常応答の変調　　　　　　　　　　　　　　　
    角屋智香, 竹下悠哉, 栗城眞也, 横澤宏一
    電子情報通信学会技術報告, 113, 500, 203, 208, Mar. 2014
  • Functional modulations in brain activity for the first and second music: A comparison of high- and low-proficiency bimusicals
    Rie Matsunaga, Koichi Yokosawa, Jun-ichi Abe
    NEUROPSYCHOLOGIA, 54, 1, 10, Feb. 2014, [Peer-reviewed]
    English, Scientific journal
  • 江戸末期の和本　　　　　　　　　　　　　　　
    横澤宏一
    生体医工学, 52, 1, 50, 2014, [Invited]
    Japanese
  • Activation of Auditory Cortex by Anticipating and Hearing Emotional Sounds: An MEG Study
    Koichi Yokosawa, Siina Pamilo, Lotta Hirvenkari, Riitta Hari, Elina Pihko
    PLOS ONE, 8, 11, e80284, Nov. 2013, [Peer-reviewed], [Lead author, Corresponding author], ［Internationally co-authored］, [International Magazine]
    English, Scientific journal
  • Neural Representation of Scale Illusion: Magnetoencephalographic Study on the Auditory Illusion Induced by Distinctive Tone Sequences in the Two Ears
    Shinya Kuriki, Koichi Yokosawa, Makoto Takahashi
    PLOS ONE, 8, 9, e75990, Sep. 2013, [Peer-reviewed]
    English, Scientific journal
  • 短期記憶課題の記銘時α波脳磁場振幅の変調　　　　　　　　　　　　　　　
    横澤 宏一, 千年 涼太, 馬場 聡美, 椴木 拓也, 高橋 誠, 栗城 眞也
    電子情報通信学会技術報告, 112, 480, 147, 152, Mar. 2013
  • Alpha-band Rhythm Modulation under the Condition of Subliminal Face Presentation: MEG Study
    Satoshi Sakuraba, Hana Kobayashi, Shinya Sakai, Koichi Yokosawa
    2013 35TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), 6909, 6912, 2013, [Peer-reviewed]
    English, International conference proceedings
  • Amplitude Modulation of Alpha-band Rhythm Caused by Mimic Collision: MEG Study
    Koichi Yokosawa, Tatsuya Watanabe, Daichi Kikuzawa, Gakuto Aoyama, Makoto Takahashi, Shinya Kuriki
    2013 35TH ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY (EMBC), 6187, 6190, 2013, [Peer-reviewed], [Lead author, Corresponding author]
    English, International conference proceedings
  • Magnetoencephalography evidence for different brain subregions serving two musical cultures
    Rie Matsunaga, Koichi Yokosawa, Jun-ichi Abe
    NEUROPSYCHOLOGIA, 50, 14, 3218, 3227, Dec. 2012, [Peer-reviewed]
    English, Scientific journal
  • 背側視覚経路は本当に道具カテゴリを処理しているのか？　　　　　　　　　　　　　　　
    桜庭 聡, 境 信哉, 山中正紀, 横澤宏一, 平山和美
    北海道医学雑誌, 87, 6, 256, Nov. 2012, [Invited]
    Japanese, Scientific journal
  • 26. Relationship between N1m (M100) latency and autistic trait
    Hayato Watanabe, Koichi Yokosawa, Harumitsu Murohashi
    Clinical Neurophysiology, 123, 9, e93, e93, Elsevier BV, Sep. 2012
    Scientific journal
  • 感覚及び認知機能が自閉症スペクトラム障害の聴性誘発磁場(M100)に及ぼす影響
    渡辺 隼人, 横澤 宏一, 久住 一郎, 室橋 春光
    生理心理学と精神生理学, 30, 2, 144, 144, 日本生理心理学会, Aug. 2012
    Japanese
  • 視覚単一モーダルミスマッチ反応における脳磁界応答　　　　　　　　　　　　　　　
    畑中亜翔, 横澤宏一, 高橋誠
    IEICE Technical Report, 111, 483, 377, 380, Mar. 2012
    Japanese, Symposium
  • 衝突模倣刺激を用いた運動の予測と知覚に伴うα波帯域脳磁場の振幅変調　　　　　　　　　　　　　　　
    菊澤大地, 横澤宏一, 齋藤千尋, 竹内文也, 関原謙介
    IEICE Technical Report, 111, 483, 293, 298, Mar. 2012
    Japanese, Symposium
  • Does the Human Dorsal Stream Really Process a Category for Tools?
    Satoshi Sakuraba, Shinya Sakai, Masanori Yamanaka, Koichi Yokosawa, Kazumi Hirayama
    JOURNAL OF NEUROSCIENCE, 32, 11, 3949, 3953, Mar. 2012, [Peer-reviewed]
    English, Scientific journal
  • 純正律和音が与える印象と脳磁界活動の関係性の評価　　　　　　　　　　　　　　　
    関大輔, 横澤宏一
    IEICE Technical Report,, 111, 483, 371, 376, 2012
    Japanese, Symposium
  • Desynchronization of alpha-band rhythm related to retrieving short-term memory　　　　　　　　　　　　　　　
    T. Momiki, K. Yokosawa, M. Sata, Y. Nakazono, M. Takahashi, S. Kuriki
    Proceedings of 2011 World Congress on Engineering and Technology, 5, 1, 165, 168, Oct. 2011, [Peer-reviewed]
    English, International conference proceedings
  • Event-Related Synchronization of δ-Rhythm Related to Recollection with memory task
    MOMIKI Takuya, SATA Masashi, NAKAZONO Yoshimi, YOKOSAWA Koichi, TAKAHASHI Makoto, KURIKI Shinya
    IEICE technical report. Neurocomputing, 110, 461, 401, 406, The Institute of Electronics, Information and Communication Engineers, 28 Feb. 2011
    Japanese, We investigated amplitude modulation of delta band rhythm associated with recollection of short term memory by using magnetoencephalograph. As memory task, each participant (n=10) was continuously presented seven arrow images, and memorized the order of the presented arrow directions. Afterwards, the numeric figure (1-7) was presented (e.g., "3"), the participant recollected the arrow direction which was presented in the order indicated by the numeric figure (i.e., third order), and answered the direction by pushing button. As a control tasks, each participant was presented the arrow image ...
  • Neuromagnetic responses to chords and correlations with their impressions
    SEKI Daisuke, YOKOSAWA Koichi
    IEICE technical report. Neurocomputing, 110, 461, 143, 146, The Institute of Electronics, Information and Communication Engineers, 28 Feb. 2011
    Japanese, Musical chords come in a variety of types, and give different impressions depending on their types. In this study, we investigated differences in evoked fields and modulations of spontaneous fields of auditory cortices, when subjects listened to three types of chords: Major, Minor, and Dissonant. Chords were made so as to have equal physical properties as possible among three types. We also conducted behavioral test to quantify impressions when subjects listened to chords and we explored the relationship between neuromagnetic activity and impression. The modulations of spontaneous fields si...
  • N1m (M100) 潜時と自閉症傾向の関係に関する検討　　　　　　　　　　　　　　　
    渡辺隼人, 横澤宏一, 室橋春光
    臨床神経生理学, 39, 5, 405, 2011, [Peer-reviewed]
    Japanese, Symposium
  • MEG study of music processing in bimusicals　　　　　　　　　　　　　　　
    Matsunaga R, Yokosawa K, Abe J
    International Journal of Bioeleoctromagnetism, 13, 4, 239, 244, 2011, [Peer-reviewed]
    English
  • 視覚情報回転変換・遅延環境における到達運動遂行時の脳磁界計測　　　　　　　　　　　　　　　
    佐多正至, 中瀬洋人, 椴木拓也, 横澤宏一, 高橋誠
    Proceeding of the 25th Symposium on Biological and Physiological Engineering, 333, 336, Aug. 2010
    Japanese, Symposium
  • 外的な音声と映像への発声の同調による神経活動の変調　　　　　　　　　　　　　　　
    豊村 暁, 横澤 宏一, 鈴木 要, 栗城 眞也
    Proceeding of the 25th Symposium on Biological and Physiological Engineering, 329, 332, Aug. 2010
    Japanese, Symposium
  • Prediction of vocalization using time-frequency information of mu rhythm　　　　　　　　　　　　　　　
    A. Toyomura, K. Yokosawa, K. Suzuki, S. Kuriki
    Proceedings of the SICE2010 Annual conference, 3407, 3408, Aug. 2010, [Peer-reviewed]
    English, International conference proceedings
  • Effect of external audio-visual pacing on vocalization-related neural activity
    TOYOMURA Akira, YOKOSAWA Koichi, SUZUKI Kaname, KURIKI Shinya
    IEICE technical report. Nonlinear problems, 110, 122, 29, 32, The Institute of Electronics, Information and Communication Engineers, 05 Jul. 2010
    English, External pacing such as metronome sound is known as having fluency-inducing effect on speech-related disorders like stuttering. The neural mechanisms of this effect have not been investigated sufficiently. We measured event related de-synchronization (ERD) with magnetoencephalography (MEG) when the subject performed either vocalization, or observation of video of vocalization. Transforming the measured signal to time-frequency representation, the ERD (〜10 and 20 Hz) when vocalizing with pacing was largely observed than without pacing. The ERD when just looking at video of vocalization also ...
  • Event-Related Desynchronization of Spontaneous Rhythm Caused by Anticipation of Collision
    AOYAMA Gakuto, YOKOSAWA Koichi, KURIKI Shinya, TAKAHASHI Makoto
    IEICE technical report. Neurocomputing, 109, 461, 357, 362, The Institute of Electronics, Information and Communication Engineers, 02 Mar. 2010
    Japanese, We investigated the modulation of spontaneous brain rhythm of magnetic fields of alpha band associated with anticipation of collision. Participants (n=11) were presented with visual stimulus of a black indeterminate form, which expanded with time to imitate a collision, on a grey background. As a control, two kinds of stimuli were presented; one was a uniform background, the brightness of which decreased with time, and the other was the black indeterminate form that changed in size in a random maimer. In addition, a cue stimulus was given two seconds before the stimulation in order that sub...
  • Analysis of MEG responses evoked by binaural stimuli
    OUCHI Kenichi, YOKOSAWA Kohichi, KURIKI Shinya, TAKAHASHI Makoto
    IEICE technical report. Neurocomputing, 109, 461, 351, 356, The Institute of Electronics, Information and Communication Engineers, 02 Mar. 2010
    Japanese, This study was aimed to delineate auditory processing for the sounds that are given distinctively to the right and left ears by using frequency-tags, i.e., amplitude modulation of sounds at different tag-frequencies. We measured binaural auditory steady state responses (SSR) of MEG having the tag frequencies and elucidated "scale illusion" which results from binaural interference. The amplitude of SSR was modulated in melody condition, in which scale tones of different contours were continuously given to the two ears, by attention from the amplitude of SSR in control condition with the same...
  • Activity of the Frontal Areas in Reaching Movements with Rotated and Delayed Visual Feedback : an MEG study
    SATA Masashi, YOKOSAWA Koichi, TAKAHASHI Makoto
    IEICE technical report. Neurocomputing, 109, 461, 57, 59, The Institute of Electronics, Information and Communication Engineers, 02 Mar. 2010
    Japanese, We have studied the brain activity during reaching movements under virtual reality environment in which relationship between vision and proprioception was tempo-spatially distorted to clarify which brain areas were related to planning and control of the movements. We have analyzed both the trajectories of reaching movements and brain activity using near infrared spectroscopy (NIRS). However, it is difficult to determine the changes during reaching movement because NIRS has low temporal resolution. In order to determine the changes of brain activity in short range such as in a reaching movem...
  • 短縮持続時間MMNmと延長持続時間MMNmの違いに関する検討　　　　　　　　　　　　　　　
    渡辺隼人, 横澤宏一, 室橋春光
    臨床神経生理学, 38, 5, 364, 2010, [Peer-reviewed]
    Japanese, Symposium
  • 二音階両耳刺激による定常応答の解析―左右聴覚野と2音階を弁別する手法―　　　　　　　　　　　　　　　
    大内健一, 横澤宏一, 栗城眞也, 高橋 誠
    Proceeding of the 24th Symposium on Biological and Physiological Engineering, 57, 60, Sep. 2009
    Japanese, Symposium
  • 視覚情報回転・遅延変換環境における到達運動遂行時の前頭葉の活動　　　　　　　　　　　　　　　
    佐多正至, 中瀬洋人, 横澤宏一, 高橋誠
    Proceeding of the 24th Symposium on Biological and Physiological Engineering, 89, 92, Sep. 2009
    Japanese, Symposium
  • 衝突の予測と視覚的知覚に伴う脳磁界応答　　　　　　　　　　　　　　　
    青山 岳人, 横澤 宏一, 栗城眞也, 高橋 誠
    Proceeding of the 24th Symposium on Biological and Physiological Engineering, 69, 72, Sep. 2009
    Japanese, Symposium
  • Effects of Auditory Attention on Oscillatory Activities around 10 Hz　　　　　　　　　　　　　　　
    H. Tanaka, K. Yokosawa, A. Otsuka, S. Kuriki
    Biomagnetism; Interdisciplinary Research and Exploration, 203, 205, Aug. 2008
    English, International conference proceedings
  • Hydrogen-gas detection system and its functions to make each sensor wireless
    Koichi Yokosawa, Sadaki Nakano, Yasushi Goto, Kazuo Saitoh, Keiji Tsukada
    IEEJ TRANSACTIONS ON ELECTRICAL AND ELECTRONIC ENGINEERING, 3, 2, 229, 235, Mar. 2008, [Peer-reviewed]
    English, Scientific journal
  • FET hydrogen-gas sensor with direct heating of catalytic metal
    Koichi Yokosawa, Kazuo Saitoh, Sadaki Nakano, Yasushi Goto, Keiji Tsukada
    SENSORS AND ACTUATORS B-CHEMICAL, 130, 1, 94, 99, Mar. 2008, [Peer-reviewed]
    English, Scientific journal
  • Oxygen interference mechanism of platinum-FET hydrogen gas sensor
    T. Yamaguchi, T. Kiwa, K. Tsukada, K. Yokosawa
    SENSORS AND ACTUATORS A-PHYSICAL, 136, 1, 244, 248, May 2007, [Peer-reviewed]
    English, Scientific journal
  • Development of high-temperature superconducting SQUID system for magnetocardiography
    Akira Tsukamoto, Daisuke Suzuki, Koichi Yokosawa, Akihiko Kandori, Yusuke Seki, Kuniomi Ogata, Tsuyoshi Miyashita, Kazuo Saitoh, Keiji Tsukada
    ELECTRONICS AND COMMUNICATIONS IN JAPAN PART II-ELECTRONICS, 90, 4, 46, 55, 2007, [Peer-reviewed]
    English, Scientific journal
  • Recent Technologies of Magnetocardiography and Impedance Magnetocardiography: Review of the Literature　　　　　　　　　　　　　　　
    A. Kandori, D. Suzuki, K. Saito, A. Tsukamoto, T. Miyashita, K. Tsukada, K. Yokosawa, K. Ogata, Y. Seki
    Progress in Superconductivity, 8, 1, 1, 7, Oct. 2006, [Peer-reviewed], [Invited]
    English
  • 簡易小型磁気シールドを用いた高温超電導SQUIDマルチチャネル心磁計システム　　　　　　　　　　　　　　　
    鈴木大介, 塚本晃, 宮下豪, 神鳥明彦, 緒方邦臣, 横澤宏一, 塚田啓二, 渡辺重行
    電子情報通信学会技術研究報告, SCE2006-12～24, 61, 66, Jul. 2006
    Japanese, Symposium
  • 高温超伝導心磁計測システムの開発　　　　　　　　　　　　　　　
    塚本晃, 鈴木大介, 横澤宏一, 神鳥明彦, 関悠介, 緒方邦臣, 宮下豪, 齋藤和夫, 塚田啓二
    電子情報通信学会和文論文誌C, J89-C, 3, 95, 103, Mar. 2006, [Peer-reviewed]
    Japanese, Scientific journal
  • A study of fast response characteristics for hydrogen sensing with platinum FET sensor
    K Tsukada, T Kiwa, T Yamaguchi, S Migitaka, Y Goto, K Yokosawa
    SENSORS AND ACTUATORS B-CHEMICAL, 114, 1, 158, 163, Mar. 2006, [Peer-reviewed]
    English, Scientific journal
  • Prototype System Comprising Battery-powered Sensor Nodes and a Wireless Network for Detecting Hydrogen Leaks
    K. Yokosawa, S. Nakano, Y. Goto, K. Tsukada
    Proceedings of the 22nd Sensor Symposium on Sensors, Micromachines, and Applied Systems, 435, 438, Oct. 2005, [Peer-reviewed]
    English, International conference proceedings
  • Development of high-throughput fabrication process of HTS SQUID for 51-ch MCG system
    A Tsukamoto, K Saitoh, K Yokosawa, D Suzuki, Y Seki, A Kandori, K Tsukada
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 426, 1580, 1584, Oct. 2005, [Peer-reviewed]
    English, Scientific journal
  • Control system for readout electronics of multi-channel magnetocardiographs using high-temperature DC superconducting quantum interference devices
    A Kandori, D Suzuki, A Tsukamoto, Y Kumagai, T Miyashita, K Ogata, Y Seki, K Yokosawa, K Tsukada
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 44, 9A, 6513, 6518, Sep. 2005, [Peer-reviewed]
    English, Scientific journal
  • MOS構造を用いた半導体FETガスセンサの水素応答性評価　　　　　　　　　　　　　　　
    後藤康, 横澤宏一, 右高園子, 中野定樹
    電気学会 ケミカルセンサ研究会資料, CHS-05-11, 49, 52, Jun. 2005
    Japanese, Symposium
  • Process of fabricating YBCOSQUIDS for 51-channel HTS MCG system
    A Tsukamoto, K Saitoh, K Yokosawa, D Suzuki, Y Seki, A Kandori, K Tsukada
    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 15, 2, 177, 180, Jun. 2005, [Peer-reviewed]
    English, Scientific journal
  • Laser terahertz emission system to investigate hydrogen gas sensors
    T Kiwa, K Tsukada, M Suzuki, M Tonouchi, S Migitaka, K Yokosawa
    APPLIED PHYSICS LETTERS, 86, 26, 261102, Jun. 2005, [Peer-reviewed]
    English, Scientific journal
  • 無線ネットワークを利用した水素ガス漏洩検知システム　　　　　　　　　　　　　　　
    横澤宏一, 後藤康, 右高園子, 中野定樹, 渡辺篤雄, 嘉本大五郎, 塚田啓二, 紀和利彦
    燃料電池, 4, 4, 60, 64, Apr. 2005, [Invited]
    Japanese
  • Terahertz emission from catalytic-metal/semiconductor interface of hydrogen sensors
    T. Kiwa, K. Tsukada, M. Suzuki, M. Tonouchi, S. Migitaka, K. Yokosawa
    Optics InfoBase Conference Papers, 2005
    International conference proceedings
  • Terahertz emission properties from palladium/silicon interface
    T Kiwa, K Tsukada, M Suzuki, M Tonouchi, S Migitaka, K Yokosawa
    Transducers '05, Digest of Technical Papers, Vols 1 and 2, 263, 266, 2005, [Peer-reviewed]
    English, International conference proceedings
  • Hydrogen gas detection system prototype with wireless sensor networks
    S Nakano, Y Goto, K Yokosawa, K Tsukada
    2005 IEEE SENSORS, VOLS 1 AND 2, 159, 162, 2005, [Peer-reviewed]
    English, International conference proceedings
  • A mobile and space-saving high-temperature superconducting multichannel magnetocardiograph in a vertical magnetically shielded cylinder
    D Suzuki, A Tsukamoto, K Yokosawa, A Kandori, K Ogata, K Tsukada
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 43, 1, 117, 120, Jan. 2004, [Peer-reviewed]
    English, Scientific journal
  • Electronic gradiometer in cylindrical magnetic shield for compact magnetocardiograph
    A Tsukamoto, K Saitoh, K Takagi, K Yokosawa, D Suzuki, K Ogata, T Miyashita, A Kandori, K Tsukada
    APPLIED PHYSICS LETTERS, 83, 24, 5080, 5082, Dec. 2003, [Peer-reviewed]
    English, Scientific journal
  • A 16-channel high-Tc SQUID-magnetometer system for magnetocardiogram mapping
    Koichi Yokosawa, Akira Tsukamoto, Daisuke Suzuki, Akihiko Kandori, Tsuyoshi Miyashita, Kuniomi Ogata, Yusuke Seki, Keiji Tsukada
    Superconductor Science and Technology, 16, 12, 1383, 1386, Dec. 2003, [Peer-reviewed]
    English, International conference proceedings
  • Magnetocardiograph based on a 4x4 array of high-temperature superconducting quantum interference devices
    K Yokosawa, A Kandori, T Miyashita, D Suzuki, K Tsukada, A Tsukamoto
    APPLIED PHYSICS LETTERS, 82, 26, 4833, 4835, Jun. 2003, [Peer-reviewed]
    English, Scientific journal
  • Applying high-T-C superconducting quantum interference device's with a room-temperature pickup coil in the measurement of impedance magnetocardiograms
    A Kandori, A Tsukamoto, D Suzuki, K Ogata, Y Soutome, T Miyashita, Y Seki, K Yokosawa, K Tsukuda, K Takagi
    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 13, 2, 393, 396, Jun. 2003, [Peer-reviewed]
    English, Scientific journal
  • A device with two orthogonal low-T-C SQUID gradiometers - A comparison of series and parallel gradiometric SQUID's
    K Yokosawa, D Suzuki, K Tsukada, A Tsukamoto
    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 13, 2, 727, 730, Jun. 2003, [Peer-reviewed]
    English, Scientific journal
  • A stabilizer for superconducting quantum interference device gradiometers for operation in lightly shielded environments
    K Yokosawa, A Kandori, T Miyashita, D Suzuki, K Tsukada, A Tsukamoto
    APPLIED PHYSICS LETTERS, 82, 18, 3059, 3061, May 2003, [Peer-reviewed]
    English, Scientific journal
  • SQUID（超伝導量子干渉素子）磁束計と心臓磁場計測への応用　　　　　　　　　　　　　　　
    横澤宏一, 塚本晃, 鈴木大介, 神鳥明彦, 宮下豪, 緒方邦臣, 関悠介, 塚田啓二
    日本応用磁気学会研究会 129回研究会資料, 47, 54, Mar. 2003, [Invited]
    Japanese, Symposium
  • A stable, single-chip, two-dimensional gradiometric device based on two superconducting quantum interference devices
    K Yokosawa, D Suzuki, K Tsukada, A Tsukamoto
    JOURNAL OF APPLIED PHYSICS, 92, 11, 6857, 6861, Dec. 2002, [Peer-reviewed]
    English, Scientific journal
  • Gradiometric Device with Orthogonal Low-Tc SQUID Gradiometers
    YOKOSAWA Koichi, SUZUKI Daisuke, TSUKADA Keiji, TSUKAMOTO Akira
    Technical report of IEICE. SCE, SCE2002-20, 221, 19, 22, The Institute of Electronics, Information and Communication Engineers, Jul. 2002
    Japanese, A gradiometric device where two orthogonal low-Tc SQUID gradiometers are integrated on a substrate has been fabricated. Not only the pickup coils but also the SQUIDs are in a gradiometric configuration. We applied a magnetic field stronger than 1mT (20 times the geomagnetic field) to the gradiometric SQUID after it had been cooled in zero-field. Although the critical current was reduced, the level of intrinsic noise remained the same as just after the cooling, in spite of the parallel-type gradiometric configuration. The basic parameters of the gradiometric device (the gradiometric balance, the cross-talk ratio, and the intrinsic noise) indicate the feasibility of its application in the estimation of current vectors in unshielded and lightly shielded environments.
  • Two-dimensional mapping of impedance magnetocardiograms
    A Kandori, T Miyashita, D Suzuki, K Yokosawa, K Tsukada
    IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING, 49, 7, 721, 728, Jul. 2002, [Peer-reviewed]
    English, Scientific journal
  • Noise properties of highly balanced YBa2Cu3Oy directly coupled gradiometers and MCG measurement in magnetically unshielded environment
    A Tsukamoto, K Yokosawa, T Fukazawa, D Suzuki, K Tsukada, T Miyashita, A Kandori, K Takagi
    PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS, 368, 1-4, 41, 44, Mar. 2002, [Peer-reviewed]
    English, Scientific journal
  • Development of a high-T-c SQUID-based magnetometer system for MCG measurement
    S Kuriki, H Oyama, A Hayashi, S Hirano, T Washio, M Matsuda, K Yokosawa
    IEICE TRANSACTIONS ON ELECTRONICS, E85C, 3, 670, 676, Mar. 2002, [Peer-reviewed]
    English, Scientific journal
  • A superconducting quantum interference device magnetometer with a room-temperature pickup coil for measuring impedance magnetocardiograms
    A Kandori, D Suzuki, K Yokosawa, A Tsukamoto, T Miyashita, K Tsukada, K Takagi
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 41, 2A, 596, 599, Feb. 2002, [Peer-reviewed]
    English, Scientific journal
  • A signal-to-noise chart for designing planar high-T-c SQUID gradiometers for magnetocardiographs
    K Yokosawa, A Tsukamoto, T Miyashita, A Kandori, D Suzuki, K Tsukada, K Takagi
    SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 15, 1, 136, 140, Jan. 2002, [Peer-reviewed]
    English, Scientific journal
  • Fabrication of highly balanced directly coupled YBa2Cu3Oy gradiometers and their noise properties in an unshielded environment
    A Tsukamoto, T Fukazawa, K Takagi, K Yokosawa, D Suzuki, K Tsukada
    APPLIED PHYSICS LETTERS, 79, 26, 4405, 4407, Dec. 2001, [Peer-reviewed]
    English, Scientific journal
  • Simplified magnetically shielded cylinder using flexible magnetic sheets for high-T-c superconducting quantum interference device magnetocardiogram systems
    D Suzuki, K Yokosawa, T Miyashita, A Kandori, K Tsukada, A Tsukamoto, S Arakawa
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 40, 10A, L1026, L1028, Oct. 2001, [Peer-reviewed]
    English, Scientific journal
  • Measurement of Two-dimensional Impedance Magnetocardiogram –Model Experiment-　　　　　　　　　　　　　　　
    A. Kandori, D. Suzuki, T. Miyashita, K. Yokosawa, K. Tsukada
    EEE/EMBS, 4, 25, 28, Oct. 2001, [Peer-reviewed]
    English
  • Mechanisms of noise increase in direct-coupled high T-c superconducting quantum interference device magnetometers exposed to magnetic fields
    K Yokosawa, S Kuriki, S Hirano, H Oyama, D Suzuki, K Tsukada
    JOURNAL OF APPLIED PHYSICS, 90, 8, 4049, 4055, Oct. 2001, [Peer-reviewed]
    English, Scientific journal
  • Axial high-temperature superconducting-quantum-interference-device gradiometer composed of magnetometers with a monolithic feedback and compensation coil
    K Yokosawa, H Oyama, S Kuriki, D Suzuki, K Tsukada
    APPLIED PHYSICS LETTERS, 78, 18, 2745, 2747, Apr. 2001, [Peer-reviewed]
    English, Scientific journal
  • Effect of a static magnetic field on a slotted high-T-c SQUID magnetometer without a flux dam
    K Yokosawa, H Oyama, S Kuriki, D Suzuki, K Tsukada, M Matsuda
    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 11, 1, 1335, 1338, Mar. 2001, [Peer-reviewed]
    English, Scientific journal
  • High-Tc SQUID magnetometers for use in moderate magnetically-shielded room
    M Matsuda, S Ono, K Kato, T Matsuura, H Oyama, A Hayashi, S Hirano, S Kuriki, K Yokosawa
    IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 11, 1, 1323, 1326, Mar. 2001, [Peer-reviewed]
    English, Scientific journal
  • Impedance magnetocardiogram
    A Kandori, T Miyashita, D Suzuki, K Yokosawa, K Tsukada
    PHYSICS IN MEDICINE AND BIOLOGY, 46, 2, N45, N48, Feb. 2001, [Peer-reviewed]
    English, Scientific journal
  • Compact and easy-operation magnetocardiograph with four-channel planar gradiometers
    K Yokosawa, D Suzuki, A Tsukamoto, T Miyashita, A Kandori, K Tsukada, K Takagi
    PROCEEDINGS OF THE 23RD ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4, 23, 3281, 3284, 2001, [Peer-reviewed]
    English, International conference proceedings
  • Measurement of two-dimensional impedance magnetocardiogram. -model experiment-
    A Kandori, D Suzuki, T Miyashita, K Yokosawa, K Tsukada
    PROCEEDINGS OF THE 23RD ANNUAL INTERNATIONAL CONFERENCE OF THE IEEE ENGINEERING IN MEDICINE AND BIOLOGY SOCIETY, VOLS 1-4, 23, 374, 377, 2001, [Peer-reviewed]
    English, International conference proceedings
  • Characteristics of High-Tc SQUID Magnetometer in Static Magnetic Fields
    OYAMA Hiroshi, KURIKI Shinya, YOKOSAWA Koichi
    The transactions of the Institute of Electronics, Information and Communication Engineers. C, 83, 9, 860, 866, The Institute of Electronics, Information and Communication Engineers, 25 Sep. 2000
    Japanese, YBa_2Cu_3O_<7-x>(YBCO)薄膜中への磁束トラップを抑制するため, 数μm幅のYBCOストリップからなるメッシュ状のSQUID磁束計を設計, 試作した.また, 遮へい電流による磁束トラップを抑える目的で, 検出コイルに弱結合(フラックスダム)を作り込んだ.10μTを超える磁場中で素子を冷却した場合, V-φ特性に磁束シフトが観測されたことから, 約10μTをしきい値として磁束トラップが生じたと推定された.このしきい値は弱結合部近傍のYBCO薄膜の幅から計算される値に対応する.ゼロ磁場冷却後に磁場を印加すると, 遮へい電流によるフラックスダムが電圧状態となり, 検出コイル内に磁束が侵入した.そのしきい値磁場は0.14μTであり, 推定された臨界電流値は0.5mAであった.印加磁場に対するフラックスダムの臨界電流の変化はフラウンホーファー的な特性を示し, 電流値が極小となる磁場の値から印加した磁束が弱結合部に集中する機構があると推測された.
  • Low-T-c SQUIDs with a built-in heater module to remove flux trapping
    K Yokosawa, D Suzuki, K Tsukada, S Ugai, T Suzuki, Y Shimizu
    SUPERCONDUCTOR SCIENCE & TECHNOLOGY, 13, 8, 1286, 1291, Aug. 2000, [Peer-reviewed]
    English, Scientific journal
  • Intracorporeal imaging and differentiation of living tissue with an ultra-high-frequency ultrasound probe
    K Yokosawa, K Sasaki, S Umemura, R Shinomura, S Ishikawa, S Sano, Y Ito
    ULTRASOUND IN MEDICINE AND BIOLOGY, 26, 4, 503, 507, May 2000, [Peer-reviewed]
    English, Scientific journal
  • Intracorporeal imaging and differentiation of living tissue with an ultra-high-frequency ultrasound probe
    K Yokosawa, K Sasaki, S Umemura, R Shinomura, S Ishikawa, S Sano, Y Ito
    ULTRASOUND IN MEDICINE AND BIOLOGY, 26, 4, 503, 507, May 2000, [Peer-reviewed]
    English, Scientific journal
  • Evaluating the entry of vortices into a slotted high-Tc SQUID magnetometer with a double-pickup-coil configuration
    K. Yokosawa, H. Oyama, S. Kuriki, D. Suzuki, K. Tsukada
    Physica C: Superconductivity and its Applications, 341-348, Pt.4, 2705, 2706, Elsevier Science Publishers B.V., 2000, [Peer-reviewed]
    English, Scientific journal
  • High-Tc dc-SQUID magnetometers with mesh structure
    H Oyama, K Yokosawa, M Matsuda, S Kuriki
    ADVANCES IN SUPERCONDUCTIVITY XII, 1027, 1029, 2000, [Peer-reviewed]
    English, International conference proceedings
  • Characteristics of High-Tc SQUID magnetometer in static magnetic field
    Oyama H, Hirano S, Yokosawa K, Matsuda M, Kuriki S
    Technical report of IEICE. SCE, 99, 408, 7, 12, The Institute of Electronics, Information and Communication Engineers, 29 Oct. 1999
    Japanese, In order to suppress the flux entry into YBa_2Cu_3O_<7-x> (YBCO) this film of dc SQUID, we have designed and fabricated SQUID magnetometers with a mesh structure having slots and holes. The magnetometer included flux dams within the pickup loop to suppress the flux entry by shielding current. Microstrips in the mesh structure have a width of 5 μm, but 12μm wide strips existed at the flux dam. In the field cooled case, we observed a flux sift caused by flux trapping in the V-Φ characteristics above 10μT. This threshold field agreed with that theoretically expected from the longest width of t...
  • Single-layer high-T-c superconducting quantum interference device magnetometer with double-pickup-coil configuration
    K Yokosawa, E Maruyama, RS Ahmad, H Oyama, S Kuriki, D Suzuki, M Koyanagi
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 37, 8, 4362, 4366, Aug. 1998, [Peer-reviewed]
    English, Scientific journal
  • Magnetic Coupling in the Direct Coupling Type SOUID Magnetometer
    Maruyama Emi, Yokosawa Koichi, Ahmad Rashdi Shah, Kuriki Shinya, Suzuki Daisuke, Koyanagi Masao
    Technical report of IEICE. SCE, 98, 222, 7, 12, The Institute of Electronics, Information and Communication Engineers, 28 Jul. 1998
    Japanese, We have fabricated high-Tc dc SQUIDs, which have different configurations and current injection lines, and measured the magnetic coupling coefficient to study the relation between the coupling coefficient and configurations.It has been found that the coupling coefficient increases, as the current flows in a simple way and the corrent density in the superconductor is distributed uniformly.In a SQUID having coplanar parallel striplines, the injection lines, which bring the induced current in the pickup coil to the SQUID, also contribute to the coupling.
  • Flux coupling in the direct-coupled high-T-c superconducting quantum interference devices
    E Maruyama, S Kuriki, K Yokosawa, RS Ahmad, D Suzuki, M Koyanagi
    JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 37, 6B, L722, L724, Jun. 1998, [Peer-reviewed]
    English, Scientific journal
  • Design and Basic Experiments of "Double Pickup-Coils" Single-Layer High-Tc SQUID Magnetometer
    Yokosawa Koichi, Ahmad Rashdi Shah, Maruyama Emi, Kuriki Shinya, Suzuki Daisuke, Koyanagi Masao
    Technical report of IEICE. SCE, 97, 219, 25, 30, The Institute of Electronics, Information and Communication Engineers, 30 Jul. 1997
    Japanese, A new configuration is proposed for the SQUID and pickup coils of direct-coupling-type high-Tc SQUID magnetometers. The proposed magnetometer has two pickup coils per SQUID, and each pickup coil occupies half the area of the substrate, divided by the bicrystal line. The structure of the pickup coils was optimized by using an analogous model to maximize the effective area of the magnetometer, which is made in a limited substrate area. Longitudinal and transverse type SQUIDs were fabricated with various self-inductances and their performances and coupling coefficients with pickup coils were c...
  • High-frequency ultrasound miniature transducers for tissue imaging
    K Yokosawa, Y Ito, S Sano, R Shinomura, Y Sato
    ULTRASONIC TRANSDUCER ENGINEERING, 3037, 13, 21, 1997, [Peer-reviewed], [Invited]
    English, International conference proceedings
  • A 120-MHz ultrasound probe for tissue imaging
    K Yokosawa, R Shinomura, S Sano, Y Ito, S Ishikawa, Y Sato
    ULTRASONIC IMAGING, 18, 4, 231, 239, Oct. 1996, [Peer-reviewed]
    English, Scientific journal
  • Thin-film ZnO ultrasonic transducers for tissue characterization
    Y Ito, K Yokosawa, S Sano, R Shinomura, Y Sato
    ISAF '96 - PROCEEDINGS OF THE TENTH IEEE INTERNATIONAL SYMPOSIUM ON APPLICATIONS OF FERROELECTRICS, VOLS 1 AND 2, 1, 83, 86, 1996, [Peer-reviewed], [Invited]
    English, International conference proceedings
  • Design and fabrication of direct-feedback gradiometer
    K Yokosawa, S Kuriki
    BIOMAGNETISM: FUNDAMENTAL RESEARCH AND CLINICAL APPLICATIONS, 7, 510, 514, 1995, [Peer-reviewed]
    English, International conference proceedings
  • DESIGN AND FABRICATION OF DIRECT-FEEDBACK GRADIOMETER - AXIAL GRADIOMETER MADE OF SUPERCONDUCTIVE FILMS AND SQUIDS
    K YOKOSAWA, S KURIKI
    REVIEW OF SCIENTIFIC INSTRUMENTS, 65, 12, 3814, 3819, Dec. 1994, [Peer-reviewed]
    English, Scientific journal
  • 直結帰還型グラジオメータの雑音解析　　　　　　　　　　　　　　　
    横澤宏一, 栗城眞也
    電気学会 マグネティックス研究会資料, MAG-93-229, 41, 50, Nov. 1993
    Japanese, Symposium
  • V-特性を考慮したSQUID磁束計のシミュレーション　　　　　　　　　　　　　　　
    福田恵子, 岡島健一, 神鳥明彦, 横澤宏一, 武田栄里子
    電気学会 マグネティックス研究会資料, MAG-92-229, 29, 36, Nov. 1992
    Japanese, Symposium
  • 多チャンネルSQUID磁束計システムの開発　　　　　　　　　　　　　　　
    横澤宏一, 岡島健一, 福田恵子, 神鳥明彦, 武田栄里子
    電気学会 マグネティックス研究会資料, MAG-92-228, 19, 27, Nov. 1992
    Japanese, Symposium
  • SQUID磁束計用シミュレータ回路に関する一検討　　　　　　　　　　　　　　　
    福田恵子, 岡島健一, 堀田正生, 横澤宏一, 神鳥明彦
    電気学会 電子回路研究会資料 ECT-92-24, 79, 86, Jun. 1992
    Japanese, Symposium
  • MU-SR STUDY OF UNIAXIALLY ANISOTROPIC SPIN-GLASS ZNMN
    S MURAYAMA, K YOKOSAWA, Y MIYAKO, T MATSUZAKI, K NAGAMINE, T YAMAZAKI, EF WASSERMANN
    SOLID STATE COMMUNICATIONS, 61, 12, 755, 759, Mar. 1987, [Peer-reviewed]
    English, Scientific journal
  • 2 SUCCESSIVE TRANSITIONS IN UNIAXIALLY ANISOTROPIC SPIN-GLASSES
    S MURAYAMA, K YOKOSAWA, Y MIYAKO, EF WASSERMANN
    PHYSICAL REVIEW LETTERS, 57, 14, 1785, 1788, Oct. 1986, [Peer-reviewed]
    English, Scientific journal
  • 8.異方的スピングラスZnMn,CdMnの磁性(北海道大学理学部物理学教室,修士論文題目・アブストラクト(1985年度)その1)
    横澤 宏一
    物性研究, 46, 4, 583, 584, 物性研究刊行会, 20 Jul. 1986
    Japanese, この論文は国立情報学研究所の電子図書館事業により電子化されました。
  • AC SUSCEPTIBILITY OF ANISOTROPIC SPIN-GLASSES ZNMN
    S MURAYAMA, K YOKOSAWA, Y MIYAKO, EF WASSERMANN
    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 54-7, Pt.1, 221, 222, Feb. 1986, [Peer-reviewed]
    English, Scientific journal
  • COEXISTENCE OF FERROMAGNETISM AND ANTIFERROMAGNETISM IN A MIXED SYSTEM CE1-XNDXAG WITH CSCL STRUCTURE
    S SUDO, S MURAYAMA, K YOKOSAWA, T MIYADAI, Y MIYAKO, Y ITO, K HIRAKAWA
    JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 52, 1-4, 431, 433, 1985, [Peer-reviewed]
    English, Scientific journal

Other Activities and Achievements

Books and other publications

  • Biomagnetism : interdisciplinary research and exploration
    柿木 隆介, 横澤 宏一, 栗城 真也
    Hokkaido University Press, 2008, 9784832903555, English, [Editor]
  • 水素利用技術集成Vol. 3　　　　　　　　　　　　　　　
    横澤宏一, 高精度水素漏洩検知無線センサシステム
    （株）エヌ・ティー・エス, 2007, [Contributor]
  • 非侵襲・可視化技術ハンドブック-ナノ・バイオ・医療から情報システムまで-　　　　　　　　　　　　　　　
    横澤宏一, 栗城眞也, 脳磁図(MEG)計測システム
    （株）エヌ・ティー・エス, 2007, [Contributor]

Research Themes

  • Exploring the neural basis of the wide-ranging social cognitive functions that support communication
    Grants-in-Aid for Scientific Research
    01 Apr. 2024 - 31 Mar. 2028
    横澤 宏一, 小野 弓絵, 齊藤 卓弥, 豊巻 敦人, 柳生 一自
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Hokkaido University, 24K03244
  • Elucidation of the mechanism of communication disorder using hyper scanning
    Grants-in-Aid for Scientific Research
    01 Apr. 2021 - 31 Mar. 2026
    柳生 一自, 齊藤 卓弥, 横澤 宏一, 白石 秀明
    私たちは北海道大学にある2台の脳磁計（Magnetoencephalography: MEG）を光ファイバーで接続し、映像・音声での仮想的対面を可能とするDual-MEGシステムを構築した。さらによりリアルな対面を行えるようカメラとプロジェクタの視差をなくすハーフミラーを用い正面からの視線合致を可能とした。このDual-MEGシステムを用いて、実対面（相手の映像と実際に対面している状況）、擬対面（録画された相手の映像と対面している状況）とを用いて、被験者に判断させる課題を行った。結果、本人は擬対面だと答えている（実対面には気付いていない）にも関わらず、右下前頭部におけるθ波の活動が、映像が実対面では脱同期、擬対面では過同期をすることを明らかにした。すなわち意識レベルでは相手の存在に気づいていない（非意識）にも関わらず、「相手の存在」を脳内で表象化する機構が同部位に存在することを示した。さらに考察をすすめこの二条件の違いは、他者との無意識の交互作用にあること、そのやりとりはfacial mimicry（表情模倣）にあることを推論した。こうした点は進化学的見地、発達学的見地からも合理的であると考えられ、トップダウンの認知とは別の、ボトムアップによって他者が象徴化される機構を示しているのかもしれない。こうした中前頭回を中心としたこの非意識下における他者存在の象徴化については統計学的な検討を深めた上で、研究成果については現在論文化を進めている。さらに2021年度は、研究対象として健常者同士によるコミュニケーションモジュールの同定、解析方法としては単一被験者の脳活動におけるモジュール同定を目的とした周波数解析と事象関連同期・脱同期の解析を進めた。熟練した脳磁図計測および解析方法を行える研究協力者が必要であり、育成を進めている。
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 21K07474
  • 生体の調和的律動構造：脳磁界計測による検証
    科学研究費助成事業
    01 Apr. 2021 - 31 Mar. 2024
    大塚 明香, 横澤 宏一, 西本 博則
    本研究では, 脳の自発律動, 視聴覚性定常反応, また, 呼吸や心拍／脈拍等の生理律動に関連する生体磁気信号をMEG装置により一元的に検出し, 成分間の周波数比を評価するための手法を開発している. 初年度（2021年度）は, 本手法で指標とする磁界成分の基礎周波数となる心拍／脈拍に関連する心磁界雑音成分について, 生理学的機序と時空間特性を調べた．まず, MEGセンサを被験者の頭部, 頸部, 胸部に近付けた時のMEG信号を計測した. また, 雑音事象の時間基準として, 心電図を同時計測した. 次に, MRI装置により頭部, 頸部, 胸部の構造画像と血管画像（MRA）を撮像し, 各部位の皮膚表面, 脳, 心臓, および, 動静脈の実形状モデルを作成した. 各モデルで定義した信号空間に対して均一の導電率を設定し, 心磁界雑音の電流密度分布を推定した. その結果, 心磁界雑音のピーク潜時は心電図のR波に同期しており, 最大電流密度は心室中隔および左右心室の心筋付近に推定された. 頭蓋内の残差成分は, 椎骨動脈と中大脳動脈に局在した. これらの結果から, 心磁界雑音には心筋細胞の膜電位変化に伴う心室収縮に由来する磁界成分と, 脳血管の脈動に関連する磁界成分が重畳している事が示唆された. 一方で, DC成分の最大電流密度は上矢状洞に推定された. これは, 動脈血の反磁性に対し, 静脈血の常磁性を反映している可能性を示す. 本研究の結果は, 心拍／脈拍成分の正確な抽出を可能にすると共に, 循環器系の非侵襲・非接触な定量的評価法の開発など, MEG活用分野の新規開拓にもつながることが期待される. 以上が本年度の成果である.
    日本学術振興会, 基盤研究(C), 国立研究開発法人情報通信研究機構, 21K12639
  • Relations between occlusal discomfort syndrome and threshold of oral sensory - a quantitative magnetoencephalographic study by statistical Parametric Mapping(SPM) analysis-
    Grants-in-Aid for Scientific Research
    01 Apr. 2015 - 31 Mar. 2019
    Satoh Kaoru
    We recorded brain activity stimulating periodontium with MEG to verified part of cerebrum and analyzed frequency using SPM8 method. As a result, the power value of alpha waves during rest and closing eyes was reduced by continuous mechanical stimulation on the periodontium. SPM analysis revealed that the activities located in the centriciput- occiput region. But the difference of region was noticed with and without stimulation. On the other hand, it required a study of correlation between power value and VAS.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Hokkaido University, 15K11189
  • How do our brains handle two different musical schemas?: a computational modeling and neuroimaging approaches
    Grants-in-Aid for Scientific Research
    01 Apr. 2014 - 31 Mar. 2016
    Matsunaga Rie, ABE Jun-ichi, YOKOSAWA Koichi, HARTONO Pitoyo
    The present study with using three different methodologies, has provided the following three findings: (1) a study of computational molding shows that our connectionist model is successful in preciously simulating a learning process of musical tonal schema shown by a child; (2) a neuroimaging study observes influences of an early experiences of music exposure on brain activities involving tonal schema processing; (3) a cross-cultural study reveals that despite advances in musical globalization, listeners’ tonal schemas still vary considerably across cultures.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Shizuoka Institute of Science and Technology, 26590182
  • A study of dual stress conditions modulated physio-psychological responses and stress management
    Grants-in-Aid for Scientific Research
    01 Apr. 2013 - 31 Mar. 2016
    Mizobe Kayo, YOKOSAWA Koichi, HAGA Sanae
    To relieve or manage stress, objective assessment of stress is required. Instead of direct assessment of stress, we have been investigating whether responses to emotional stimuli are modulated by stress. As emotional stimuli, pleasant an unpleasant pictures were selected from the International Affective Picture System (Univ. of Florida) database and were presented to 20 healthy volunteers.
    Visual analog scale (VAS), Magnetoencephalograms (MEG) and traditional physiological markers, heart rate and oxygen saturation of the peripheral artery (SpO2), were recorded concurrently. MEG was different between the emotional categories and was modulated by the fasting-induced stress. MEG seems to be practical and powerful for detecting a prompt response to emotion and assessing stress objectively, probably because of its high temporal resolution and selectivity to a specific brain region.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Hokkaido University, 25670940

Industrial Property Rights

  • 漏洩検知システム
    Patent right, 横澤 宏一, 中野 定樹, 齊藤 和夫, 株式会社日立製作所
    特願2007-111641, 20 Apr. 2007
    特開2008-267992, 06 Nov. 2008
    特許第4282728号
    27 Mar. 2009
    200903063953644921
  • 磁場計測装置
    Patent right, 神鳥 明彦, 宮下 豪, 塚田 啓二, 横澤 宏一, 鈴木 大介, 塚本 晃, 株式会社日立製作所
    特願2001-218951, 19 Jul. 2001
    特開2003-035758, 07 Feb. 2003
    特許第4193382号
    03 Oct. 2008
    200903074713615659
  • ガス検知システム
    Patent right, 後藤 康, 横澤 宏一, 中野 定樹, 株式会社日立製作所
    特願2005-197024, 06 Jul. 2005
    特開2007-017208, 25 Jan. 2007
    特許第4157881号
    18 Jul. 2008
    200903050414137965
  • ガスセンサ及びガス検知システム
    Patent right, 横澤 宏一, 中野 定樹, 後藤 康, 株式会社日立製作所
    特願2006-155829, 05 Jun. 2006
    特開2007-322355, 13 Dec. 2007
    200903016276275134
  • 磁場遮蔽装置及びこれを用いる生体磁場計測装置
    Patent right, 鈴木 大介, 二ノ宮 篤, 宮下 豪, 神鳥 明彦, 塚田 啓二, 横澤 宏一, 株式会社日立製作所
    特願2001-086628, 26 Mar. 2001
    特開2002-136494, 14 May 2002
    特許第4013492号
    21 Sep. 2007
    201103071458805499
  • ガス検知システム
    Patent right, 横澤 宏一, 中野 定樹, 後藤 康, 株式会社日立製作所
    特願2004-341897, 26 Nov. 2004
    特開2006-155009, 15 Jun. 2006
    特許第3950135号
    27 Apr. 2007
    200903090821358706
  • ガス漏洩検知機能付き無線端末及びそれを用いたガス漏洩検知システム及びガス漏洩通報方法
    Patent right, 中野 定樹, 横澤 宏一, 後藤 康, 株式会社日立製作所
    特願2004-342242, 26 Nov. 2004
    特開2006-157248, 15 Jun. 2006
    特許第3945714号
    20 Apr. 2007
    200903075431925473
  • 半導体ガスセンサとその製造方法
    Patent right, 後藤 康, 峰 利之, 横澤 宏一, 株式会社日立製作所
    特願2005-199657, 08 Jul. 2005
    特開2007-017312, 25 Jan. 2007
    200903008705921934
  • 針状超音波探触子および超音波診断装置
    Patent right, 横澤 宏一, 梅村 晋一郎, 株式会社日立メディコ
    特願平10-009989, 22 Jan. 1998
    特開平11-206759, 03 Aug. 1999
    特許第3844869号
    25 Aug. 2006
    200903076724684426
  • 生体磁場計測装置
    Patent right, 塚田 啓二, 宮下 豪, 神鳥 明彦, 鈴木 大介, 横澤 宏一, 株式会社日立製作所
    特願2003-418909, 17 Dec. 2003
    特開2004-081894, 18 Mar. 2004
    特許第3705285号
    05 Aug. 2005
    200903025073617748
  • 針状超音波探触子
    Patent right, 横澤 宏一, 石川 靜夫, 篠村 隆一, 伊藤 由喜男, 佐野 秀造, 神田 浩, 株式会社日立メディコ
    特願平7-161960, 28 Jun. 1995
    特開平9-010213, 14 Jan. 1997
    特許第3654309号
    11 Mar. 2005
    200903077773718340
  • 磁場計測装置
    Patent right, 塚本 晃, 横澤 宏一, 鈴木 大介, 神鳥 明彦, 塚田 啓二, 株式会社日立製作所
    特願2003-139754, 19 May 2003
    特開2004-337478, 02 Dec. 2004
    特許第3642061号
    04 Feb. 2005
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syllabus

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