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Taiki Takahashi

Graduate School of Humanities and Human Sciences　Division of Human Sciences　Department of Behavioral ScienceProfessor
Center for Human Nature Artificial Intelligence and NeuroscienceProfessor
Center for Experimental Research in Social SciencesProfessor
Research and Education Center for Brain ScienceProfessor

Ph.D in Physics
The University of Tokyo

Researcher basic information

■ Degree
  • Ph.D in physics (Biophysics), The University of Tokyo
  • 修士（理学）, 東京大学
■ URL
researchmap URLホームページURL■ Various IDs
J-Global ID■ Research Keywords and Fields
Research Keyword
  • 情報科学（量子情報論理）
  • 応用数学
  • Neurolaw
  • Sociophysics
  • Neuroeconomics
Research Field
  • Humanities & Social Sciences, Cognitive science, Neuroeconomics, Quantum Decision Theory
■ Educational Organization

Career

■ Career
Career
  • May 2026 - Present
    Hokkaido University, 大学院文学研究科 行動システム科学講座・ 半導体フロンティア研究機構・人間知・脳・AIセンター・脳科学研究教育センター ・ 社会科学実験研究センター, Professor
  • Sep. 2025 - May 2026
    Hokkaido University, 大学院文学研究科 行動システム科学講座・ 脳科学研究教育センター ・ 社会科学実験研究センタ, Professor
Educational Background
  • 2001, The University of Tokyo, 理学系研究科, 物理学専攻 理学博士, Japan
  • 2001, The University of Tokyo, Physics Graduate School, Division of Science, Ph.D
  • 1998, The University of Tokyo, 理学系研究科, 物理学専攻 理学修士, Japan
  • 1998, The University of Tokyo, Physics Graduate School, Division of Science, Master of Science
  • 1996, The University of Tokyo, Faculty of Science, Department of Physics, Japan
  • 1996, The University of Tokyo, Department of Physics, Bachelor of Science
  • 1992, 開成高等学校 卒業
Committee Memberships
  • Apr. 2019 - Present
    CHAIN center for human nature, AI and neuroscience, joint faculty, Others
  • Aug. 2017 - Present
    Journal of Addiction & Recovery, EDITORIAL BOARD, Others
  • Apr. 2016 - Present
    横幹連合, 基幹役員, Society
  • 2016 - Present
    International Journal of Applied and Experimental Mathematics, Editorial board member, Society
  • 2014 - Present
    Adaptive Human Behavior and Physiology (Springer), Editorial board member, Society
  • Present
    北海道大学 脳科学研究教育センター, 基幹教員, Society
  • Present
    Journal of Behavioral Economics and Finance, 編集委員, Society
  • Present
    人間行動進化学会, 編集委員, Society
  • Present
    薬物アルコール学会, 評議員, Society
  • Sep. 2017 - Sep. 2018
    Frontiers in Applied Mathematics and Analysis, Topic Editor, Society
  • Mar. 2011 - Mar. 2014
    行動経済学会, 理事, Society
  • 新潟県立大学 実証社会科学研究センター, 運営委員, Others

Research activity information

■ Awards
  • Dec. 2012, 行動経済学会, 奨励賞
  • 2007, Best paper award (Association for Neuropsychoeconomics)
  • Best paper award (Association for Neuropsychoeconomics)
    Takahashi Taiki
■ Papers
  • A Note on the Relationship of Normative Principles between Decision under Risk and over Time
    Taiki Takahashi
    Applied Mathematics, 16, 16, 741, 751, 2025, [Peer-reviewed], [Lead author]
    English, Scientific journal
  • Application of the symbolic regression program AI-Feynman to psychology.
    Masato Miyazaki; Ken-Ichi Ishikawa; Ken'ichiro Nakashima; Hiroshi Shimizu; Taiki Takahashi; Nobuyuki Takahashi
    Frontiers in artificial intelligence, 6, 1039438, 1039438, 2023, [Peer-reviewed], [International Magazine]
    English, Scientific journal, The discovery of hidden laws in data is the core challenge in many fields, from the natural sciences to the social sciences. However, this task has historically relied on human intuition and experience in many areas, including psychology. Therefore, discovering laws using artificial intelligence (AI) has two significant advantages. First, it makes it possible to detect laws that humans cannot discover. Second, it will help construct more accurate theories. An AI called AI-Feynman was released in a very different field, and it performed impressively. Although AI-Feynman was initially designed to discover laws in physics, it can also work well in psychology. This research aims to examine whether AI-Feynman can be a new data analysis method for inter-temporal choice experiments by testing whether it can discover the hyperbolic discount model as a discount function. An inter-temporal choice experiment was conducted to accomplish these objectives, and the data were input into AI-Feynman. As a result, seven discount function candidates were proposed by AI-Feynman. One candidate was the hyperbolic discount model, which is currently considered the most accurate. The three functions of the root-mean-squared errors were superior to the hyperbolic discount model. Moreover, one of the three candidates was more "hyperbolic" than the standard hyperbolic discount function. These results indicate two things. One is that AI-Feynman can be a new data analysis method for inter-temporal choice experiments. The other is that AI-Feynman can discover discount functions that humans cannot find.
  • A balance for fairness: fair distribution utilising physics.
    Song-Ju Kim; Taiki Takahashi; Kazuo Sano
    Humanities and Social Sciences Communications, 8, 131, May 2021, [Peer-reviewed]
    English, Scientific journal
  • Contributions of Science of Free Will to Neuroecocnomics and Quantum Decision Theory
    Taiki Takahashi
    A Genealogy of Self-Interest in Economics, 221, 234, Springer Singapore, 2021, [Peer-reviewed]
    In book
  • Editorial: Discounting Models in Behavioral Health Economics and Quantitative Health Psychology.
    María José Muñoz Torrecillas; Salvador Cruz Rambaud; Taiki Takahashi
    Frontiers in public health, 9, 658808, 658808, 2021, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Editorial: Intertemporal Choice and Its Anomalies
    Salvador Cruz Rambaud; Taiki Takahashi
    Frontiers in Applied Mathematics and Statistics, 5, Frontiers Media S.A., 11 Feb. 2019
    English, Scientific journal
  • A New Analysis on Self-Control in Intertemporal Choice and Mediterranean Dietary Pattern.
    Brian C Howatt; María José Muñoz Torrecillas; Salvador Cruz Rambaud; Taiki Takahashi
    Frontiers in public health, 7, 165, 165, 2019, [Peer-reviewed], [International Magazine]
    English, Scientific journal, This paper completes Muñoz Torrecillas et al. (1) results and conclusions investigating the relationship between adherence to healthy dietary habits, specifically the Mediterranean Diet (hereinafter, MD), and impulsivity in intertemporal choices. Impulsivity can be defined as the strong preference for small immediate payoffs over larger delayed payoffs, and in the original study this behavior was captured by the parameter k (discount rate of the hyperbolic discount function), calculated using an automated scoring mechanism. Adherence to MD was measured by the KIDMED index and then grouped into three levels: high, medium, and low. While the authors observed that individuals in the high adherence group had the shallowest discounting and individuals in the low adherence group had the steepest discounting, the data were not statistically analyzed in depth. Therefore, the purpose of the present paper is to propose a preliminary quantitative model for this relationship and evaluate its significance. Tests revealed a significant interaction between adherence to MD and magnitude of delayed rewards when predicting discount rates. Specifically, the degree to which impulsivity decreases as adherence to MD increases is strongly influenced by delayed rewards of smaller magnitude. These findings are consistent with the authors' claims that healthy dietary habits may be closely linked with greater self-control when payoffs are small, and thus warrant further examination. The results do not indicate causality though, so future studies could also investigate the directions of this relationship as a means of developing behavioral interventions.
  • Quantitative Cross-Cultural Similarities and Differences in Social Discounting for Gains and Losses.
    Sarah E Stegall; Tyler Collette; Takuji Kinjo; Taiki Takahashi; Paul Romanowich
    Frontiers in public health, 7, 297, 297, 2019, [Peer-reviewed], [International Magazine]
    English, Scientific journal, Social discounting is when resource allocation decreases as social distance increases. Studies fitting different quantitative models to social discounting data have shown that a q-exponential function based on Tsallis' statistics best fits loss data, whereas a hyperbolic power function best fits gain data. However, a social discounting sign effect, where losses are discounted less than equivalent gains, has not been consistently found. This study fit four different quantitative social discounting models to gain and loss data for 40 United States (US) participants. We compared quantitative model fits to previous studies collected with Japanese and German participants to determine if (1) different quantitative social discounting models best fit loss and gain data, (2) US participants discounted less gains than Japanese participants, but not losses, and (3) US participants showed the sign effect. Results showed that the q-exponential function and the hyperbolic power function best fit median loss and gain data, respectively. There were no significant absolute differences between cultures for gains or losses, and US participants showed a robust sign effect. While most results for US participants were consistent with previous data, future cross-cultural social discounting studies are needed that manipulate sign as well as reward magnitude to determine best quantitative model fits. Social discounting results are also discussed in relation to their application to important health behaviors such as smoking and obesity.
  • Performance in Multi-Armed Bandit Tasks in Relation to Ambiguity-Preference Within a Learning Algorithm
    Song-Ju Kim; Taiki Takahashi
    Frontiers in Applied Mathematics and Statistics, 4, 27, Frontiers Media SA, 25 Jul. 2018, [Peer-reviewed]
  • Impatience and Inconsistency in Intertemporal Choice: An Experimental Analysis
    María José Muñoz Torrecillas; Taiki Takahashi; Jesús Gil Roales-Nieto; Salvador Cruz Rambaud; Zaida Callejón Ruiz; Blas Torrecillas Jover
    Journal of Behavioral Finance, 19, 2, 190, 198, Institute of Behavioral Finance, 03 Apr. 2018, [Peer-reviewed]
    English, Scientific journal
  • Behavioral Economics of Addiction in the Age of a Super Smart Society: Society 5.0
    TAKAHASHI Taiki
    Oukan (Journal of Transdisciplinary Federation of Science and Technology), 12, 2, 119, 122, Transdisciplinary Federation of Science and Technology, 2018, [Peer-reviewed]
    English, In behavioral economics, violation of rationality in human judgment and decision making
    has been investigated. In neoclassical economics, on the contrary, almost all human behavior (in-
    cluding addiction) has been assumed to be rational. Recent developments in Neuroeconomics have
    revealed neural foundations for human judgment and decision making. Cyber technologies offer new
    risks for new types of addiction (e.g., internet addiction, online video game addiction, and smartphone
    addiction); while these technologies can potentially offer new intervention methods for the treatment
    of addiction. In this review, current findings in the studies of addiction in the age of “super smart
    society” (i.e., societies highly digitized and connected via SNSs) are introduced and future directions
    are discussed.
  • Self-Control in Intertemporal Choice and Mediterranean Dietary Pattern.
    María J Muñoz Torrecillas; Salvador Cruz Rambaud; Taiki Takahashi
    Frontiers in public health, 6, 176, 176, 2018, [Peer-reviewed], [International Magazine]
    English, Scientific journal, Background: The Mediterranean Diet (hereinafter MD) is considered a healthy dietary pattern. Adherence to this pattern can be assessed by means of the KIDMED test by which individuals are assigned an index and classified into three groups of adherence to MD: high, medium, and low. In addition, impulsivity or impatience in intertemporal choice has been defined as a strong preference for small immediate rewards over large delayed ones. Objective: This study examines the relationship between dietary habits, specifically Mediterranean dietary pattern, measured by the KIDMED index, and the exhibited impatience in intertemporal choices, by means of the parameter k (discount rate of the hyperbolic discount function). Methods: A sample of 207 university students answered a questionnaire based on two tests: the KIDMED test, to assess the degree of adherence to MD, and an intertemporal choice questionnaire, to assess impatience or impulsivity. Individuals were grouped depending on their KIDMED score and then the discount rate or impulsivity parameter was calculated for each group. Results: Discount rates were inversely related to the degree of adherence to MD. The values of overall k were 1.53, 1.91, and 3.71% for the groups exhibiting high, medium and low adherence to MD, respectively. We also found higher k-values for larger rewards (magnitude effect) in the three groups. Conclusion: High adherence to MD is related to less steep time discounting, which implies less impulsivity (more self-control) or lower discount rates. Conversely, low adherence to MD is related to steeper time discounting, which implies impulsivity or higher discount rates. These findings could be used to identify the target population where policy interventions are needed in order to promote healthier diet habits.
  • A note on the roles of quantum and mechanical models in social biophysics.
    Taiki Takahashi; Song-Ju Kim; Makoto Naruse
    Progress in biophysics and molecular biology, 130, Pt A, 103, 105, Nov. 2017, [Peer-reviewed], [International Magazine]
    English, Scientific journal, Recent advances in the applications of quantum models into various disciplines such as cognitive science, social sciences, economics, and biology witnessed enormous achievements and possible future progress. In this paper, we propose one of the most promising directions in the applications of quantum models: the combination of quantum and mechanical models in social biophysics. The possible resulting discipline may be called as experimental quantum social biophysics and could foster our understandings of the relationships between the society and individuals.
  • Can quantum approaches benefit biology of decision making?
    Taiki Takahashi
    Progress in biophysics and molecular biology, 130, Pt A, 99, 102, Nov. 2017, [Peer-reviewed], [International Magazine]
    English, Scientific journal, Human decision making has recently been focused in the emerging fields of quantum decision theory and neuroeconomics. The former discipline utilizes mathematical formulations developed in quantum theory, while the latter combines behavioral economics and neurobiology. In this paper, the author speculates on possible future directions unifying the two approaches, by contrasting the roles of quantum theory in the birth of molecular biology of the gene.
  • Testosterone promotes either dominance or submissiveness in the Ultimatum Game depending on players' social rank.
    Yukako Inoue; Taiki Takahashi; Robert P Burriss; Sakura Arai; Toshikazu Hasegawa; Toshio Yamagishi; Toko Kiyonari
    Scientific reports, 7, 1, 5335, 5335, 13 Jul. 2017, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • The Q-generalized Probability Weighting Function and the Q-exponential Probability Discounting Function
    Shinsuke Tokuda; Taiki Takahashi
    International Journal of Applied & Experimental Mathematics, 2, 1, Apr. 2017, [Peer-reviewed]
  • Percolation of optical excitation mediated by near-field interactions
    Makoto Naruse; Song-Ju Kim; Taiki Takahashi; Masashi Aono; Kouichi Akahane; Mario D'Acunto; Hirokazu Hori; Lars Thylen; Makoto Katori; Motoichi Ohtsu
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 471, 162, 168, Apr. 2017, [Peer-reviewed]
    English, Scientific journal
  • Observed and Normative Discount Functions in Addiction and other Diseases.
    Salvador Cruz Rambaud; María J Muñoz Torrecillas; Taiki Takahashi
    Frontiers in pharmacology, 8, 416, 416, 2017, [Peer-reviewed], [International Magazine]
    English, Scientific journal, The aim of this paper is to find a suitable discount function able to describe the progression of a certain addiction or disease under treatment as a discounting process. In effect, a certain indicator related to a disease decays over time in a manner which is mathematically similar to the way in which discounting has been modeled. We analyze the discount functions observed in experiments which study addictive and other problematic behaviors as well as some alternative hyperbola-like discount functions in order to fit the patience exhibited by the subject after receiving the treatment. Additionally, it has been experimentally found that people with addiction display high rates of discount (impatience) and preference reversals (dynamic inconsistency). This excessive discounting must be correctly modeled by a suitable discount function, otherwise, it can become a trans-disease process underlying addiction and other disorders. The (generalized) exponentiated hyperbolic discount function is proposed to describe the progression of a disease with respect to the treatment, since it maintains the property of inconsistency by exhibiting a decreasing discount rate after an initial period in which the opposite occurs.
  • Relationship between Salivary Oxytocin Levels and Generosity in Preschoolers.
    Takayuki Fujii; Joanna Schug; Kuniyuki Nishina; Taiki Takahashi; Hiroyuki Okada; Haruto Takagishi
    Scientific reports, 6, 38662, 38662, 08 Dec. 2016, [Peer-reviewed], [International Magazine]
    English, Scientific journal, This study examined the association between salivary oxytocin (sOT) levels and generosity in preschoolers. Fifty preschoolers played two dictator games (DG) by deciding how to allocate 10 chocolates between themselves and another child, who was either from the same class as the participant (ingroup member), or an unknown child from another class (outgroup member). sOT levels were assessed in saliva collected from the children immediately prior to the DG tasks. While sOT levels were negatively associated with allocations made to both ingroup and outgroup members by boys, among girl sOT levels were positively related to allocations made to ingroup members, and unrelated to allocations made to outgroup members. These results suggest sex differences in the association between salivary oxytocin and generosity.
  • Cross-cultural comparisons of delay discounting of gain and loss.
    Keiko Ishii; Lili Gang; Taiki Takahashi
    Neuro endocrinology letters, 37, 6, 427, 432, Nov. 2016, [Peer-reviewed], [International Magazine]
    English, Scientific journal, OBJECTIVES: People generally tend to discount future outcomes in favor of smaller but immediate gains (i.e., delay discounting). The present research examined cultural similarities and differences in delay discounting of gain and loss between Chinese and Japanese, based on a q-exponential model of intertemporal choice. METHOD: Using a hypothetical situation, we asked 65 Japanese participants and 51 Chinese participants to choose between receiving (or paying) a different amount of money immediately or with a specified delay (1 week, 2 weeks, 1 month, 6 months, 1 year, 5 years, and 25 years). For each delay, participants completed a series of 40 binary choices for gain or loss. RESULTS: Regardless of cultures, the q-exponential model was the optimal model. Both impulsivity and time-inconsistency were higher for future gains than for future losses. In addition to the cultural similarities, Chinese participants discounted future gains and losses more steeply than did Japanese. In contrast, Japanese participants were more time-inconsistent in delay discounting than were Chinese, suggesting that the reduction in their subjective value depended relatively on delay.
  • Detection of Phase Transition in Generalized Polya Urn in Information Cascade Experiment
    Masafumi Hino; Yosuke Irie; Masato Hisakado; Taiki Takahashi; Shintaro Mori
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 85, 3, Mar. 2016, [Peer-reviewed]
    English, Scientific journal
  • 20pBU-11 Domino effect in information cascade experiment
    Mori S.; Hino M.; Hisakado M.; Takahashi T.
    Meeting Abstracts of the Physical Society of Japan, 71, 2902, 2902, The Physical Society of Japan (JPS), 2016
    Japanese
  • Discounting delayed and probabilistic monetary gains and losses by smokers of cigarettes
    Yu Ohmura; Taiki Takahashi; Nozomi Kitamura
    Behavioral Economics of Preferences, Choices, and Happiness, 179, 196, Springer Japan, 01 Jan. 2016, [Peer-reviewed]
    English, In book
  • Loss of self-control in intertemporal choice may be attributable to logarithmic time-perception
    Taiki Takahashi
    Behavioral Economics of Preferences, Choices, and Happiness, 117, 122, Springer Japan, 01 Jan. 2016, [Peer-reviewed]
    English, In book
  • Pharmacological and Expectancy Effects of a Low Amount of Alcohol Drinking on Outcome Valuation and Risk Perception in Males and Females.
    Tomokazu Tsurugizawa; Shinsuke Tokuda; Tokiko Harada; Taiki Takahashi; Norihiro Sadato
    PloS one, 11, 4, e0154083, 2016, [Peer-reviewed], [International Magazine]
    English, Scientific journal, The high-dose, alcohol-induced influences on risk perception and loss aversion depend on sex. On the other hand, low-dose alcohol has less effect on risky behavior. However, the effect of low-dose alcohol on subjective valuation of gain or loss and also the effect of placebo (expectancy of alcohol) on risk perception have not been fully investigated. We investigated the effects of low-dose alcohol (0.02 g/100 ml blood alcohol concentration) and placebo effects on subjective risk perception and subjective valuation of uncertain gain and loss in females and males. Participants in the control group and the placebo group were served alcohol-free, wine-flavored beverage and participants of alcohol group were served wine (14% alcohol). The placebo group was not informed that the drink was not alcohol but the control group was informed. Then paper-pencil tasks for subjective risk perception and valuation of gain or loss were performed 45 min after drinking the beverage. The participants were asked to draw the line on a 180 mm scale for each question. The placebo effects as well as the low-dose alcohol effects were observed in subjective valuations of gain or loss. Except for effect of beverages, a gender difference was also observed for subjective likelihood. The females estimated a low-probability loss as more likely and estimated a high-probability gain as less likely than did the males. From the Stevens' law fitting analysis, the placebo, not alcohol, significantly induced the psychophysical effect of the subjective valuation of gain or loss. These results indicate that the psychological effects of expectancy of alcohol (placebo) could be a major factor in changing the subjective valuation of gain or loss over the pharmacological effects of a small amount of alcohol (like a glass of wine). Furthermore, these results also indicate that gender differences should be taken into account when investigating pharmacological or psychological effect on decision-making.
  • Detection of Non-self-correcting Nature of Information Cascade
    Shintaro Mori; Masafumi Hino; Masato Hisakado; Taiki Takahashi
    PROCEEDINGS OF ECCS 2014: EUROPEAN CONFERENCE ON COMPLEX SYSTEMS, 1, 10, 2016, [Peer-reviewed]
    English, International conference proceedings
  • Quantum decision-making in newcomb’s problem: Effect of reward size
    Nobuye Ishibashi-Ohmura; Taiki Takahashi
    NeuroQuantology, 13, 3, 293, 298, E-FLOW PDF NeuroQuantology, 01 Sep. 2015, [Peer-reviewed]
    English, Scientific journal
  • Reinforcement learning in depression: A review of computational research.
    Chong Chen; Taiki Takahashi; Shin Nakagawa; Takeshi Inoue; Ichiro Kusumi
    Neuroscience and biobehavioral reviews, 55, 55, 247, 67, Aug. 2015, [Peer-reviewed], [International Magazine]
    English, Scientific journal, Despite being considered primarily a mood disorder, major depressive disorder (MDD) is characterized by cognitive and decision making deficits. Recent research has employed computational models of reinforcement learning (RL) to address these deficits. The computational approach has the advantage in making explicit predictions about learning and behavior, specifying the process parameters of RL, differentiating between model-free and model-based RL, and the computational model-based functional magnetic resonance imaging and electroencephalography. With these merits there has been an emerging field of computational psychiatry and here we review specific studies that focused on MDD. Considerable evidence suggests that MDD is associated with impaired brain signals of reward prediction error and expected value ('wanting'), decreased reward sensitivity ('liking') and/or learning (be it model-free or model-based), etc., although the causality remains unclear. These parameters may serve as valuable intermediate phenotypes of MDD, linking general clinical symptoms to underlying molecular dysfunctions. We believe future computational research at clinical, systems, and cellular/molecular/genetic levels will propel us toward a better understanding of the disease.
  • 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
    Conference proceedings : ... Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual Conference, 2015, 6646, 9, 2015, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Remembrance of happy things past: positive autobiographical memories are intrinsically rewarding and valuable, but not in depression.
    Chong Chen; Taiki Takahashi; Si Yang
    Frontiers in psychology, 6, 222, 222, 2015, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • The Q-Exponential Decay of Subjective Probability for Future Reward: A Psychophysical Time Approach
    Taiki Takahashi; Shinsuke Tokuda; Masato Nishimura; Ryo Kimura
    ENTROPY, 16, 10, 5537, 5545, Oct. 2014, [Peer-reviewed], [Invited]
    English, Scientific journal
  • 脳科学と組織科学の接面を求めて ニューロエコノミックスの新展開―心理物理学的神経経済学―
    高橋泰城
    組織科学, 47, 4, 23, 34, 白桃書房, Jun. 2014, [Peer-reviewed], [Invited]
    Japanese
  • Toward a physical theory of quantum cognition.
    Taiki Takahashi
    Topics in cognitive science, 6, 1, 104, 7, Jan. 2014, [Peer-reviewed], [International Magazine]
    English, Recently, mathematical models based on quantum formalism have been developed in cognitive science. The target articles in this special issue of Topics in Cognitive Science clearly illustrate how quantum theoretical formalism can account for various aspects of human judgment and decision making in a quantitatively and mathematically rigorous manner. In this commentary, we show how future studies in quantum cognition and decision making should be developed to establish theoretical foundations based on physical theory, by introducing Taketani's three-stage theory of the development of science. Also, implications for neuroeconomics (another rapidly evolving approach to human judgment and decision making) are discussed.
  • Neuroeconomics of psychopathy: risk taking in probability discounting of gain and loss predicts psychopathy.
    Taiki Takahashi; Haruto Takagishi; Hirofumi Nishinaka; Takaki Makino; Hiroki Fukui
    Neuro endocrinology letters, 35, 6, 510, 7, 2014, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Collective adoption of max-min strategy in an information cascade voting experiment
    Shintaro Mori; Masato Hisakado; Taiki Takahashi
    Journal of the Physical Society of Japan, 82, 8, Aug. 2013, [Peer-reviewed]
    English, Scientific journal
  • Smokers, smoking deprivation, and time discounting
    Shoko Yamane; Hiroyasu Yoneda; Taiki Takahashi; Yoshio Kamijo; Yasuhiro Komori; Fumihiko Hiruma; Yoshiro Tsutsui
    Journal of Socio-Economics, 45, 47, 56, Aug. 2013, [Peer-reviewed]
    English, Scientific journal
  • DNA polymorphism in the FKBP5 gene affects impulsivity in intertemporal choice.
    Yoshiya Kawamura; Taiki Takahashi; Xiaoxi Liu; Nao Nishida; Katsushi Tokunaga; Ko Ukawa; Yoshihiro Noda; Akane Yoshikawa; Takafumi Shimada; Tadashi Umekage; Tsukasa Sasak
    Asia-Pacific psychiatry : official journal of the Pacific Rim College of Psychiatrists, 5, 1, 31, 8, Mar. 2013, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • A psychophysical theory of Shannon entropy.
    Taiki Takahashi
    Neuro endocrinology letters, 34, 7, 615, 7, 2013, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Psychophysical neuroeconomics of decision making: Nonlinear time perception commonly explains anomalies in temporal and probability discounting
    Taiki Takahashi; Ruokang Han
    Applied Mathematics, 4, 11, 1520, 1525, Springer Verlag, 2013, [Peer-reviewed]
    English, Scientific journal
  • Mathematical neurolaw of crime and punishment: The q-exponential punishment function.
    Yokoyama T; Takahashi T
    Applied Mathematics, 2013, [Peer-reviewed]
    English, Scientific journal
  • Towards a physical theory of quantum decision making.
    Taiki Takahashi
    Topics in Cognitive Science, 2013, [Peer-reviewed], [Invited]
    English, Scientific journal
  • The q-Exponential Probability Discounting of Gain and Loss
    T Takahashi; R Han; H Nishinaka; T Makino; H Fukui
    Applied Mathematics 4, 876-881, 2013, [Peer-reviewed]
    English, Scientific journal
  • The q-Exponential Social Discounting Functions of Gain and Loss
    T Takahashi
    Applied Mathematics 4, 445-448, 2013, [Peer-reviewed]
    English, Scientific journal
  • Socio-Emotional Status, Education, and Time-Discounting in Japanese Non-Smoking Population: A Multi-Generational Study
    Shoko Yamane; Taiki Takahashi; Akiko Kamesaka; Yoshiro Tsutsui; Fumio Ohtake
    Psychology, 4, 2, 124-132, 124-132, 2013, [Peer-reviewed]
    English, Scientific journal
  • Variation in the DRD2 gene affects impulsivity in intertemporal choice
    Yoshiya Kawamura; Taiki Takahashi; Xiaoxi Liu; Nao Nishida; Yoshihiro Noda; Akane Yoshikawa; Tadashi Umekage; Tsukasa Sasaki
    Open Journal of Psychiatry, 2013, 3, 26-31, 2013, [Peer-reviewed]
    English, Scientific journal
  • rationality in quantum decision theory
    Takahashi Taiki
    科学哲学, 46, 2, 17, 30, 日本科学哲学会 ; 1968-, 2013, [Peer-reviewed], [Invited]
    Japanese
  • Psychophysics of time perception and valuation in temporal discounting of gain and loss
    Ruokang Han; Taiki Takahashi
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 391, 24, 6568, 6576, Dec. 2012, [Peer-reviewed]
    English, Scientific journal
  • An Experimental Comparison of Quantum Decision Theoretical Models of Intertemporal Choice for Gain and Loss
    T Takahashi; H Nishinaka; T Makino; R Han; H Fukui
    Journal of Quantum Information Science, 2, 119-122, Dec. 2012, [Peer-reviewed]
    English, Scientific journal
  • Emotion Interference Solves Social Dilemma
    Taiki Takahashi
    Theoretical Economics Letters, 2, 446-449, Dec. 2012, [Peer-reviewed]
    English, Scientific journal
  • A nonlinear neural population coding theory of quantum cognition and decision making
    Takahashi Taiki; Taksu Cheon
    A nonlinear neural population coding theory of quantum cognition and decision making, 2,, 183, -186, Dec. 2012, [Peer-reviewed]
    English, Scientific journal
  • Quantum Phenomenology of Conjunction Fallacy
    Taksu Cheon; Taiki Takahashi
    JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 81, 10, Oct. 2012, [Peer-reviewed]
    English, Scientific journal
  • DNA polymorphism in the FKBP5 gene affects impulsivity in intertemporal choice
    Yoshiya Kawamura; Taiki Takahashi; Xiaoxi Liu; Nao Nishida; Katsushi Tokunaga; Tadashi Umekage; Tsukasa Sasaki
    ASIA-PACIFIC PSYCHIATRY, 4, 147, 147, Oct. 2012, [Peer-reviewed]
    English
  • Phase transition to a two-peak phase in an information-cascade voting experiment.
    Shintaro Mori; Masato Hisakado; Taiki Takahashi
    Physical review. E, Statistical, nonlinear, and soft matter physics, 86, 2 Pt 2, 026109, 026109, Aug. 2012, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Time Discounting: Psychophysics of Intertemporal and Probabilistic Choices
    T Takahashi; R Han; F Nakamura
    Journal of Behavioral Economics and Finance, 5, 10-14, 14, Association of Behavioral Economics and Finance, Aug. 2012, [Peer-reviewed], [Invited]
    English, Scientific journal, Intertemporal and probabilistic choices have been attracting attention in behavioral neuroeconomics. Although recent advances in neuroeconomics demonstrated neural processes underlying intertemporal and probabilistic choices, the roles of psychophysical effects on the choices have largely been understudied. In this paper, we review the roles of psychophysical effects in time and risk attitudes. It is shown that Loewenstein-Prelec's generalized hyperbolic temporal discount function (Loewenstein and Prelec (1992)) and Prelec's probability weighting function (Prelec (1998)) are naturally derived from psychophysical laws of time-perception.
  • Tempospect Theory of Intertemporal Choice
    Takahashi Taiki
    Psychology, 3, (8), 555-557, 555-557, Aug. 2012, [Peer-reviewed]
    English, Scientific journal
  • Molecular neuroeconomics of crime and punishment: implications for neurolaw.
    Taiki Takahashi
    Neuro endocrinology letters, 33, 7, 667, 73, 2012, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Quantum Decision Theory for Computational Psychiatry
    Taiki Takahashi
    NEUROQUANTOLOGY, 10, 4, 688, 691, 2012, [Peer-reviewed]
    English, Scientific journal
  • Depressive patients are more impulsive and inconsistent in intertemporal choice behavior for monetary gain and loss than healthy subjects- an analysis based on Tsallis' statistics
    Taiki Takahashi; Hidemi Oono; Takeshi Inoue; Shuken Boku; Yuki Kako; Yuji Kitaichi; Ichiro Kusumi; Takuya Masui; Shin Nakagawa; Katsuji Suzuki; Teruaki Tanaka; Tsukasa Koyama; Mark H; B. Radford
    Neuro Endocrinol Lett. 2008, 29(3):351-358, Nov. 2011, [Peer-reviewed]
    Scientific journal, Depression has been associated with impaired neural processing of reward and

    punishment. However, to date, little is known regarding the relationship

    between depression and intertemporal choice for gain and loss. We compared

    impulsivity and inconsistency in intertemporal choice for monetary gain and

    loss (quantified with parameters in the q-exponential discount function based

    on Tsallis' statistics) between depressive patients and healthy control

    subjects. This examination is potentially important for advances in

    neuroeconomics of intertemporal choice, because depression is associated with

    ...
  • Psychophysics of the probability weighting function
    Taiki Takahashi
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 390, 5, 902, 905, Mar. 2011, [Peer-reviewed]
    English, Scientific journal
  • A neuroeconomic theory of rational addiction and nonlinear time-perception
    Taiki Takahashi
    NEUROENDOCRINOLOGY LETTERS, 32, 3, 221, 225, 2011, [Peer-reviewed]
    English
  • Neuroeconomics of suicide
    NeuroEndocrinology Letters, 32, 4, 400, 404, 2011, [Peer-reviewed]
  • Interference and inequality in quantum decision theory
    Taksu Cheon; Taiki Takahashi
    PHYSICS LETTERS A, 375, 2, 100, 104, Dec. 2010, [Peer-reviewed]
    English, Scientific journal
  • Toward molecular neuroeconomics of obesity
    Taiki Takahashi
    MEDICAL HYPOTHESES, 75, 4, 393, 396, Oct. 2010, [Peer-reviewed]
    English, Scientific journal
  • A neuroeconomic theory of bidirectional synaptic plasticity and addiction
    Taiki Takahashi
    MEDICAL HYPOTHESES, 75, 4, 356, 358, Oct. 2010, [Peer-reviewed]
    English, Scientific journal
  • A social discounting model based on Tsallis' statistics
    Taiki Takahashi
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 389, 17, 3600, 3603, Sep. 2010, [Peer-reviewed]
    English, Scientific journal
  • Salivary alpha-amylase levels and big five personality factors in adults
    Keigo Inukai; Mizuho Shinada; Shigehito Tanida; Chisato Takahashi; Nobuhiro Mifune; Haruto Takagishi; Yutaka Horita; Hirofumi Hashimoto; Kunihiro Yokota; Tatsuya Kameda; Toshio Yamagishi; Taiki Takahashi
    NEUROENDOCRINOLOGY LETTERS, 31, 6, 771, 774, 2010, [Peer-reviewed]
    English, Scientific journal
  • Salivary testosterone levels and autism-spectrum quotient in adults
    Haruto Takagishi; Taiki Takahashi; Toshio Yamagishi; Mizuho Shinada; Keigo Inukai; Shigehito Tanida; Nobuhiro Mifune; Yutaka Horita; Hirofumi Hashimoto; Li Yang; Tatsuya Kameda
    NEUROENDOCRINOLOGY LETTERS, 31, 6, 837, 841, 2010, [Peer-reviewed]
    English, Scientific journal
  • Stress hormones predict hyperbolic time-discount rates six months later in adults
    Taiki Takahashi; Mizuho Shinada; Keigo Inukai; Shigehito Tanida; Chisato Takahashi; Nobuhiro Mifune; Haruto Takagishi; Yutaka Horita; Hirofumi Hashimoto; Kunihiro Yokota; Tatsuya Kameda; Toshio Yamagishi
    NEUROENDOCRINOLOGY LETTERS, 31, 5, 616, 621, 2010, [Peer-reviewed]
    English, Scientific journal
  • Theoretical Frameworks for Neuroeconomics of Intertemporal Choice
    Taiki Takahashi
    Journal of Neuroscience, Psychology, and Economics, 2, 2, 75, 90, Nov. 2009, [Peer-reviewed]
    English, Scientific journal
  • Tsallis' non-extensive free energy as a subjective value of an uncertain reward
    Taiki Takahashi
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 388, 5, 715, 719, Mar. 2009, [Peer-reviewed]
    English, Scientific journal
  • Cultural neuroeconomics of intertemporal choice
    Taiki Takahashi; Tarik Hadzibeganovic; Sergio A. Cannas; Takaki Makino; Hiroki Fukui; Shinobu Kitayama
    NEUROENDOCRINOLOGY LETTERS, 30, 2, 185, 191, Feb. 2009, [Peer-reviewed]
    English
  • Relationship between personality scales of impulsiveness and discounting of monetary gains and losses in smokers and never smokers.
    International Journal of Psychology Research, in press, 2009, [Peer-reviewed]
  • DECISION UNDER AMBIGUITY: EFFECTS OF SIGN AND MAGNITUDE
    Keigo Inukai; Taiki Takahashi
    INTERNATIONAL JOURNAL OF NEUROSCIENCE, 119, 8, 1170, 1178, 2009, [Peer-reviewed]
    English, Scientific journal
  • Alcohol use and discounting of delayed and probabilistic gain and loss
    Taiki Takahashi; Yu Ohmura; Hidemi Oono; Mark Radford
    NEUROENDOCRINOLOGY LETTERS, 30, 6, 749, 752, 2009, [Peer-reviewed]
    English, Scientific journal
  • Salivary alpha-amylase levels and rejection of unfair offers in the ultimatum game
    Haruto Takagishi; Takayuki Fujii; Shinya Kameshima; Michiko Koizumi; Taiki Takahashi
    NEUROENDOCRINOLOGY LETTERS, 30, 5, 643, 646, 2009, [Peer-reviewed]
    English, Scientific journal
  • Neural correlates of the rejection of unfair offers in the impunity game
    Haruto Takagishi; Taiki Takahashi; Akira Toyomura; Nina Takashino; Michiko Koizumi; Toshio Yamagishi
    NEUROENDOCRINOLOGY LETTERS, 30, 4, 496, 500, 2009, [Peer-reviewed]
    English, Scientific journal
  • The relationship between impulsiveness and rejection behavior in the ultimatum game
    Haruto Takagishi; Taiki Takahashi; Toshio Yamagishi
    Impulsivity: Causes, Control and Disorders, 217, 225, Nova Science Publishers, Inc., 2009
    English, In book
  • Biophysics of risk aversion based on neurotransmitter receptor theory
    Taiki Takahashi
    NEUROENDOCRINOLOGY LETTERS, 29, 4, 399, 404, Aug. 2008, [Peer-reviewed]
    English
  • Salivary alpha-amylase levels and temporal discounting for primary reward under a simulated life-threatening condition
    Taiki Takahashi; Koki Ikeda; Toshikazu Hasegawa
    NEUROENDOCRINOLOGY LETTERS, 29, 4, 451, 453, Aug. 2008, [Peer-reviewed]
    English, Scientific journal
  • Depressive patients are more impulsive and inconsistent in intertemporal choice behavior for monetary gain and loss than healthy subjects - An analysis based on Tsallis' statistics
    Taiki Takahashi; Hiderni Oono; Takeshi Inoue; Shuken Boku; Yuki Kako; Yuji Kitaichi; Ichiro Kusumi; Takuya Masui; Shidn Nakagawa; Katsuji Suzuki; Teruaki Tanaka; Tsukasa Koyama; Mark H. B. Radford
    NEUROENDOCRINOLOGY LETTERS, 29, 3, 351, 358, Jun. 2008, [Peer-reviewed]
    English, Scientific journal
  • Psychophysics of time perception and intertemporal choice models
    Taiki Takahashi; Hidemi Oono; Mark H. B. Radford
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 387, 8-9, 2066, 2074, Mar. 2008, [Peer-reviewed]
    English, Scientific journal
  • A comparison between Tsallis's statistics-based and generalized quasi-hyperbolic discount models in humans
    Taiki Takahashi
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 387, 2-3, 551, 556, Jan. 2008, [Peer-reviewed]
    English, Scientific journal
  • Sex hormonal modulation of hyperbolic discount factor in men
    Taiki Takahashi; Kikue Sakaguchi; Mariko Oki; Toshikazu Hasegawa
    Journal of Neuroscience, Psychology, and Economics, 1, 1, 7, 16, 2008, [Peer-reviewed]
    English, Scientific journal
  • A probabilistic choice model based on Tsallis' statistics
    Taiki Takahashi
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 386, 1, 335, 338, Dec. 2007, [Peer-reviewed]
    English, Scientific journal
  • A comparison of intertemporal choices for oneself versus someone else based on Tsallis' statistics
    Talki Takahashi
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 385, 2, 637, 644, Nov. 2007, [Peer-reviewed]
    English, Scientific journal
  • Social evaluation-induced amylase elevation and economic decision-making in the dictator game in humans
    Taiki Takahashi; Koki Ikeda; Toshikazu Hasegawa
    NEUROENDOCRINOLOGY LETTERS, 28, 5, 662, 665, Oct. 2007, [Peer-reviewed]
    English, Scientific journal
  • Economic decision-making in the ultimatum game by smokers
    Taiki Takahashi
    NEUROENDOCRINOLOGY LETTERS, 28, 5, 659, 661, Oct. 2007, [Peer-reviewed]
    English, Scientific journal
  • A hyperbolic decay of subjective probability of obtaining delayed rewards
    Taiki Takahashi; Koki Ikeda; Toshikazu Hasegawa
    BEHAVIORAL AND BRAIN FUNCTIONS, 3, 52, Sep. 2007, [Peer-reviewed]
    English, Scientific journal
  • Sex differences in the relationship between cortisol levels and the Empathy and Systemizing Quotients in humans
    Yoshihisa Nakayama; Taiki Takahashi; Akio Wakabayashi; Hidemi Ono; Mark H. B. Radford
    NEUROENDOCRINOLOGY LETTERS, 28, 4, 445, 448, Aug. 2007, [Peer-reviewed]
    English, Scientific journal
  • Empirical estimation of consistency parameter in intertemporal choice based on Tsallis' statistics
    Taiki Takahashi; Hidemi Oono; Mark H. B. Radford
    PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS, 381, 338, 342, Jul. 2007, [Peer-reviewed]
    English, Scientific journal
  • Comparison of probabilistic choice models in humans
    Taiki Takahashi; Hidemi Oono; Mark Hb Radford
    BEHAVIORAL AND BRAIN FUNCTIONS, 3, 20, Apr. 2007, [Peer-reviewed]
    English, Scientific journal
  • Two-month stabitity of hyperbotic discount rates for delayed monetary gains in abstinent inpatient alcoholics
    Taiki Takahashi; Aizo Furukawa; Tomohiro Miyakawa; Hitoshi Maesato; Susumu Higuchi
    NEUROENDOCRINOLOGY LETTERS, 28, 2, 131, 136, Apr. 2007, [Peer-reviewed]
    English, Scientific journal
  • Salivary alpha-amylase levels and hyperbolic discounting in male humans
    Taiki Takahashi; Koki Ikeda; Hirokata Fukushima; Toshikazu Hasegawa
    NEUROENDOCRINOLOGY LETTERS, 28, 1, 17, 20, Feb. 2007, [Peer-reviewed]
    English, Scientific journal
  • Non-reciprocal altruism may be attributable to hyperbolicity in social discounting function
    Taiki Takahashi
    MEDICAL HYPOTHESES, 68, 1, 184, 187, 2007, [Peer-reviewed]
    English, Scientific journal
  • Hyperbolic discounting may be reduced to electrical coupling in dopaminergic neural circuits
    Taiki Takahashi
    MEDICAL HYPOTHESES, 69, 1, 195, 198, 2007, [Peer-reviewed]
    English, Scientific journal
  • Three-month stability of delay and probability discounting measures
    Yu Ohmura; Taiki Takahashi; Nozomi Kitamura; Paul Wehr
    EXPERIMENTAL AND CLINICAL PSYCHOPHARMACOLOGY, 14, 3, 318, 328, Aug. 2006, [Peer-reviewed]
    English, Scientific journal
  • Testosterone levels and discounting delayed monetary gains and losses in male humans
    Taiki Takahashi; Kikue Sakaguchi; Mariko Oki; Seijiro Homma; Toshikazu Hasegawa
    NEUROENDOCRINOLOGY LETTERS, 27, 4, 439, 444, Aug. 2006, [Peer-reviewed]
    English, Scientific journal
  • Distinct neuropsychological processes may mediate decision-making under uncertainty with known and unknown probability in gain and loss frames
    Keigo Inukai; Taiki Takahashi
    Medical Hypotheses, 67, 2, 283, 286, 2006, [Peer-reviewed]
    English, Scientific journal
  • A mathematical framework for probabilistic choice based on information theory and psychophysics
    T Takahashi
    MEDICAL HYPOTHESES, 67, 1, 183, 186, 2006, [Peer-reviewed]
    English, Scientific journal
  • Queuing theory under competitive social foraging may explain a mathematical equivalence of delay and probability in impulsive decision-making
    T Takahashi
    MEDICAL HYPOTHESES, 67, 2, 276, 279, 2006, [Peer-reviewed]
    English, Scientific journal
  • Time-estimation error following Weber-Fechner law may explain subadditive time-discounting
    Taiki Takahashi
    MEDICAL HYPOTHESES, 67, 6, 1372, 1374, 2006, [Peer-reviewed]
    English, Scientific journal
  • Social memory, social stress, and economic behaviors
    T Takahashi
    BRAIN RESEARCH BULLETIN, 67, 5, 398, 402, Nov. 2005, [Peer-reviewed]
    English, Scientific journal
  • Discounting delayed and probabilistic monetary gains and losses by smokers of cigarettes
    Y Ohmura; T Takahashi; N Kitamura
    PSYCHOPHARMACOLOGY, 182, 4, 508, 515, Nov. 2005, [Peer-reviewed]
    English, Scientific journal
  • Cortisol levels and prospective and retrospective memory in humans
    Y Nakayama; T Takahashi; MHB Radford
    NEUROENDOCRINOLOGY LETTERS, 26, 5, 599, 602, Oct. 2005, [Peer-reviewed]
    English, Scientific journal
  • Anxiety, reactivity, and social stress-induced cortisol elevation in humans
    T Takahashi; K Ikeda; M Ishikawa; N Kitamura; T Tsukasaki; D Nakama; T Kameda
    NEUROENDOCRINOLOGY LETTERS, 26, 4, 351, 354, Aug. 2005, [Peer-reviewed]
    English, Scientific journal
  • Interpersonal trust and social stress-induced cortisol elevation.
    Taiki Takahashi; Koki Ikeda; Miho Ishikawa; Nozomi Kitamura; Takafumi Tsukasaki; Daisuke Nakama; Tatsuya Kameda
    Neuroreport, 16, 2, 197, 9, 08 Feb. 2005, [Peer-reviewed], [International Magazine]
    English, Scientific journal
  • Loss of self-control in intertemporal choice may be attributable to logarithmic time-perception
    T Takahashi
    MEDICAL HYPOTHESES, 65, 4, 691, 693, 2005, [Peer-reviewed]
    English, Scientific journal
  • 1P251 Neuroendocrine modulation of social cognition and economic decision-making
    Takahashi T.
    Seibutsu Butsuri, 45, S94, The Biophysical Society of Japan General Incorporated Association, 2005, [Peer-reviewed]
    Japanese
  • Cortisol levels and time-discounting of monetary gain in humans
    T Takahashi
    NEUROREPORT, 15, 13, 2145, 2147, Sep. 2004, [Peer-reviewed]
    English, Scientific journal
  • Social stress-induced cortisol elevation acutely impairs social memory in humans
    T Takahashi; K Ikeda; M Ishikawa; T Tsukasaki; D Nakama; S Tanida; T Kameda
    NEUROSCIENCE LETTERS, 363, 2, 125, 130, Jun. 2004, [Peer-reviewed]
    English, Scientific journal
  • ラット脳海馬における環境ホルモンBisphenol-Aの作用の解析
    田辺 伸聡; 高橋 泰城; 服部 高明; 岡田 和嗣; 舩江 良彦; 川戸 佳
    生物物理, 43, Suppl.1, S232, S232, (一社)日本生物物理学会, Aug. 2003
    Japanese
  • Hippocampal cytochrome P450s synthesize brain neurosteroids which are paracrine neuromodulators of synaptic signal transduction.
    Keisuke Shibuya; Norio Takata; Yasushi Hojo; Aizo Furukawa; Nobuaki Yasumatsu; Tetsuya Kimoto; Taihei Enami; Kumiko Suzuki; Nobuaki Tanabe; Hirotaka Ishii; Hideo Mukai; Taiki Takahashi; Taka-aki Hattori; Suguru Kawato
    Biochimica et biophysica acta, 1619, 3, 301, 16, 17 Feb. 2003, [Peer-reviewed], [International Magazine]
    English, Scientific journal, Hippocampal pyramidal neurons and granule neurons of adult male rats are equipped with a complete machinery for the synthesis of pregnenolone, dehydroepiandrosterone, 17beta-estradiol and testosterone as well as their sulfate esters. These brain neurosteroids are synthesized by cytochrome P450s (P450scc, P45017alpha and P450arom) from endogenous cholesterol. Synthesis is acutely dependent on the Ca(2+) influx attendant upon neuron-neuron communication via N-methyl-D-aspartate (NMDA) receptors. Pregnenolone sulfate, estradiol and corticosterone rapidly modulate neuronal signal transduction and the induction of long-term potentiation via NMDA receptors and putative membrane steroid receptors. Brain neurosteroids are therefore promising neuromodulators that may either activate or inactivate neuron-neuron communication, thereby mediating learning and memory in the hippocampus.
  • Hippocampal cytochrome P450s synthesize brain neurosteroids which are paracrine neuromodulators of synaptic signal transduction
    K Shibuya; N Takata; Y Hojo; A Furukawa; N Yasumatsu; T Kimoto; T Enami; K Suzuki; N Tanabe; H Ishii; H Mukai; T Takahashi; T Hattoria; S Kawato
    BIOCHIMICA ET BIOPHYSICA ACTA-GENERAL SUBJECTS, 1619, 3, 301, 316, Feb. 2003, [Peer-reviewed]
    English, Scientific journal
  • Morphological changes of hippocampal CA1 pyramidal cells caused by 17beta-estradiol
    Tsurugizawa T.; Takahashi T.; Kawato S.
    Seibutsu Butsuri, 43, S240, The Biophysical Society of Japan General Incorporated Association, 2003, [Peer-reviewed]
    Japanese
  • Corticosterone acutely prolonged N-methyl-D-aspartate receptor-mediated Ca2+ elevation in cultured rat hippocampal neurons
    T Takahashi; T Kimoto; N Tanabe; TA Hattori; N Yasumatsu; S Kawato
    JOURNAL OF NEUROCHEMISTRY, 83, 6, 1441, 1451, Dec. 2002, [Peer-reviewed]
    English, Scientific journal
  • 脳海馬における細胞内シグナル伝達系の,環境ホルモンによるかく乱作用の解析
    田辺 伸聡; 服部 高明; 高橋 泰城; 川戸 佳
    環境ホルモン学会研究発表会要旨集, 5回, 288, 288, 日本内分泌撹乱物質学会, Nov. 2002
    Japanese
  • 1M1030 The endocrine disruptor bisphenol-A evokes intracellular calcium signalling in hippocampal neurons
    Tanabe N.; Hattori T.; Takahashi T.; Kawato S.
    Seibutsu Butsuri, 42, 2, S74, The Biophysical Society of Japan General Incorporated Association, 2002, [Peer-reviewed]
    Japanese
  • 海馬における17β・エストラジオール合成とその作用
    服部 高明; 小南 思郎; 北條 泰嗣; 高橋 泰城; 川戸 佳
    日本内分泌学会雑誌, 77, 2, 310, 310, (一社)日本内分泌学会, Sep. 2001
    Japanese
  • P450研究の新展開 バイオシグナル・ジェネレーターとしての機能を考える 脳ニューロステロイドの作用とその産生を行うP450
    川戸 佳; 木本 哲也; 北条 康嗣; 服部 高明; 高橋 泰城
    生化学, 73, 8, 658, 658, (公社)日本生化学会, Aug. 2001
    Japanese
  • Synthesis and action of estradiol in rat hippocampus
    Hattori T; Hojo Y
    Seibutsu Butsuri, 41, S147, The Biophysical Society of Japan General Incorporated Association, 2001, [Peer-reviewed]
    Japanese
  • Synthesis and action of estradiol in hippocampus
    Hattori T.; Takahashi T.; Kawato S.
    Seibutsu Butsuri, 40, S53, The Biophysical Society of Japan General Incorporated Association, 2000, [Peer-reviewed]
    Japanese
■ Other Activities and Achievements
■ Books and other publications
■ Lectures, oral presentations, etc.
■ Syllabus
  • 修士論文・特定課題指導特殊演習, 2024年, 修士課程, 文学院
  • 社会・制度モジュール特殊科目B, 2024年, 学士課程, 現代日本学プログラム課程
  • 博士論文指導特殊演習, 2024年, 博士後期課程, 文学研究科
  • 行動システム科学概論, 2024年, 学士課程, 文学部
  • 博士論文指導特殊演習Ⅰ, 2024年, 博士後期課程, 文学院
  • 行動科学概論, 2024年, 学士課程, 文学部
  • 博士論文指導特殊演習Ⅱ, 2024年, 博士後期課程, 文学院
  • 社会の認識, 2024年, 学士課程, 全学教育
  • 社会・制度モジュール特殊科目B, 2024年, 学士課程, 現代日本学プログラム課程
  • 英語演習, 2024年, 学士課程, 全学教育
  • 行動科学演習, 2024年, 学士課程, 文学部
  • 行動科学特殊演習, 2024年, 学士課程, 文学部
  • 行動科学特殊演習, 2024年, 学士課程, 文学部
  • 行動科学実験実習, 2024年, 学士課程, 文学部
■ Affiliated academic society
  • 日本アルコール・薬物医学会
  • 日本人間行動進化学会
  • 生物物理学会
  • 行動経済学会
  • JAPANESE MEDICAL SOCIETY OF ALCOHOL & DRUG STUDIES
■ Research Themes
  • Study on a methodology that gives a bird's-eye view of interdisciplinary relationships based on statistics and machine learning
    Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Pioneering)
    09 Jul. 2021 - 31 Mar. 2025
    松井 知子; 村上 大輔; 椿 広計; 高橋 泰城; 船渡川 伊久子; 山形 与志樹
    COVID-19のパンデミックが世界経済に与える影響は、2008年の世界金融危機よりも深刻であり、COVID-19が経済や気候に与える影響を予測することは、現在、大きな関心事となっている。本研究では、経済への確率的ショックを含むように拡張したDICE（Dynamic Integrated Climate-Economy）モデルを用いて、COVID-19のようなショックイベントが経済や気候に与える影響を検討した。DICEモデルの基礎となる状態変数に確率的な要素を取り入れ、再帰的な動的計画問題として解くことを試みた。ショックイベントによって引き起こされるジャンププロセスとして、離散的な確率的ショック変数を追加してDICEモデルを拡張し、ストレス状態と通常状態における経済をモデル化した。この拡張モデルをショックイベントが100年に1度ランダムに発生し、それが5年間続くと仮定して、最適確率制御問題としていくつかのシナリオで解いた。その結果、各ショックイベント後に世界の総生産が完全に回復するならば、COVID-19のショックイベントが気温や炭素濃度に与える影響は、保守的に5年間で年間の総生産が10%減少した場合でも重大ではないことを示した。しかし、ショックイベントによって生産高が5％減少し、再帰的に生産性の低下をもたらして次の期間に伝播した場合には、長期的な気温低下は0.1℃であるものの、炭素濃度に与える影響は大きいことを示した。決定論的なDICEモデルを用いた場合には、気温低下はより大きくなることを示した（約0.25℃）。
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Research (Pioneering), The Institute of Statistical Mathematics, 21K18309
  • 脳領域／個体／集団間のインタラクション創発原理の解明と適用
    CREST
    2017 - 2022
    Ichiro Tsuda
    JST, Competitive research funding
  • 集合知の情報集約過程の定量的記述と社会的学習の影響
    ソフトコンピューティング 基盤研究(C)
    Apr. 2017 - Mar. 2021
    守真太郎
    Competitive research funding
  • a genealogy of self-interest
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B)
    01 Apr. 2015 - 31 Mar. 2018
    TAISHIDO Masanori; TAKAHASHI Satoshi; MURAI Akihiko
    This research project has been performed to clarify a genealogy of economic agents on which economics traditionally has been based, from “the birth of economics” in Scottish enlightenment to current behavioral economics or neuroeconomics. In this analysis, it has become clear that not only the historical context of the advent of “homo economicus ”or the idea of “self-interest ”is very important, but also that it has involved various and diversified images of human including altruism and sociability.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (B), Toyo University, 15H03331
  • Psycho-biological foundations of norm enforcement
    Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Exploratory Research
    01 Apr. 2015 - 31 Mar. 2018
    Kiyonari Toko
    Endogenous testosterone (T) is generally considered to enhance social dominance, but the results of economic game experiments that have examined the relationship between decision making and T are inconsistent. We explored the relationship between pre-existing social status and salivary T level among members of a rugby team at a Japanese university, where a strong seniority norm maintains hierarchical relationships. We analyzed participants’ level of acquiescence (how much more they offered beyond the lowest offer they would accept) based on their decisions both as proposer and responder in a series of one-shot Ultimatum Games. In summary, our results consistently suggest that T may enhance socially dominant behavior among higher-status persons, and that the effect of T on lower-status persons merits further investigation.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Aoyama Gakuin University, 15K13115
  • 単一光子を用いた意思決定機能構築の研究
    光工学・光量子科学 挑戦的萌芽
    Apr. 2015 - Mar. 2018
    成瀬誠
    意思決定問題は、情報通信技術の広範かつ重要な応用の根底にあり、機械学習・人工知能の基礎問題として熱心に研究されている。しかし、動的に変化する不確実な環境での意思決定とは、ベターな選択肢の探索と速やかな決断という難しいトレードオフを孕んだ「多本腕バンディット問題（Multi-armed bandit problem (MAB)」であり、その解決は容易ではない。本研究提案者らは、世界に先駆けてMABを近接場光を介した光励起輸送を用いて解決可能であることを発見した（Sci. Rep. 2013）。本研究の目的は、光の量子性をさらに積極利用することにより、人工知能の時代における光及び光技術による新たな価値として、単一光子を用いた意思決定機能の可能性を示すことである。本年度は、フランス・グルノーブルの研究チームと連携し、単一光子の確率性と粒子性を基礎として、ナノダイヤモンドを用いた単一光子源と偏光制御を用いた独自のシステムを構築し、的確で速やかな意思決定を物理的に実現することに世界で初めて成功した。単一光子の場としての性質（非局所性）が探索に活かされ、粒子としての性質が決断に直結している。本研究はScientific Reports誌に掲載され、内外の多くのメディアに報道された。中でもMIT Technology Review誌は“First Demonstration of Photonic Intelligence（世界発の光知能）”として大きく取り上げた。また、これらの結果を踏まえた理論モデル構築に着手した。
    Competitive research funding
  • Adolescent Mind & Self-Regulation, steering committee
    Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area)
    01 Apr. 2011 - 31 Mar. 2016
    Kasai Kiyoto; HASEGAWA Mariko; TAKAHASHI Taiki; NISHIDA Atsushi; SASAKI Tsukasa; Fujii Naotaka; HAGIWARA Hiroko; HASHIMOTO Ryuichiro; SAKAI Hiromu; FUKUDA Masato; OKANOYA Kazuo; YAMASAKI Syudo; YAMAWAKI Shigeto; MURAI Toshiya; TANAKA Satoshi
    The steering committee of the Adolescent Mind & Self-Regulation has consolidated our two key concepts, or “Adolescence” and “Self-regulation”, which evolved into a textbook “the Science of Adolescence (University of Tokyo Press)”. Comprehensive management for each research stages (A01-A03) has led to a great deal of trans-disciplinary achievements among humanities and sciences. A lot of cooperation works with other academic fields have resulted in establishment of the UTIDAM, an official multidisciplinary-research institute in University of Tokyo. The committee have also created an international network engaging in research for adolescence, and have got a leading position in East Asia. Outreach and public-relation to the public and adolescents have been emphasized throughout the study period.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), The University of Tokyo, 23118001
  • Experimental econophysics of social learning and collective intelligence
    Grants-in-Aid for Scientific Research
    2013 - 2015
    Mori Shintaro; TAKAHASHI TAIKI; HISAKADO MASATO; HINO MASAFUMI
    It has been considered that the social learning where agents get information from the behaviors and choices of other agents is the most important factor in the description and the understanding of social and economical phenomena. We have controlled the uncertainty of the information of human collectives in an information cascade experiment and showed that there occurs a phase transition of
    non-linear Polya urn. Theoretically, we clarify when the phase transition becomes continuous or discontinuous and the universality class of the former continuous one. Furthermore, we study several ideas how to increase the accuracy of collective intelligence in information cascade.
    Japan Society for the Promotion of Science, Grant-in-Aid for Challenging Exploratory Research, Kitasato University, Coinvestigator not use grants, Competitive research funding, 25610109
  • Developmental Process of Self-Regulation in Adolescence
    Grants-in-Aid for Scientific Research
    2011 - 2015
    HIRAIWA-HASEGAWA Mariko; OKAZAKI Yuji; ANDO Shuntaro; YAMASAKI Syudo; KAORI Endo
    We broke into 3 teams and studied the developmental process of self-regulation. First, Tokyo TEEN Cohort team has constituted the first large-scale adolescent cohort (N=4,478) in Japan and conducted a 2-wave large scale longitudinal survey. The survey based on community, and recruited participants randomly from three municipalities in Tokyo using the resident register. Results showed that self-regulation is based on language acquisition from an early age, and develops with the maturation of understanding of vocabulary and grasp of grammar. Second, Twin study team conducted a longitudinal study at Secondary School of the Faculty of Education, the University of Tokyo, which is a combined junior high and high school and a school where many twins belong. They found factors which have impact on self-regulation of daily habits. Finally, Neuroeconomics team showed a biological foundation of self-regulation.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research on Innovative Areas (Research in a proposed research area), The Graduate University for Advanced Studies, Coinvestigator not use grants, Competitive research funding, 23118002
  • Behavioral Finance and New Trends in Economic Analysis
    Grants-in-Aid for Scientific Research
    2012 - 2014
    KAMESAKA Akiko; TAKAHASHI Taiki
    This project aimed to proceed economic or financial analysis taking in recent results in other fields such as psychology etc., and have done researches on behavioral economics and finance.
    This project's output includes publication in professional journals, oral presentation at international conferences, invited speeches at international and domestic meetings.
    The project leader started to conduct investor survey with Prof. Robert Schiller, winner of Nobel prize.
    Japan Society for the Promotion of Science, Grant-in-Aid for Scientific Research (C), Aoyama Gakuin University, Coinvestigator not use grants, Competitive research funding, 24530358
  • Time-inconsistent Behavior and Efficacy of Self-control
    Grants-in-Aid for Scientific Research(基盤研究(B))
    2008 - 2011
    Fumihiko HIRUMA; 須斎 正幸; 筒井 義郎; 池田 新介; 高橋 泰城
    Time discount rate is an important factor determining decision-making between present and future. The higher(lower) time discount rate implies the present-biased(future-oriented) decision-making. Our survey studies revealed that the respondents who have higher cognitive ability and stronger self-control tend to have lower time discount rate. This result implies the possibility of education as a tool to amend the time discount rate.
    Ministry of Education, Culture, Sports, Science and Technology, 基盤研究(B), 早稲田大学, Coinvestigator not use grants, Competitive research funding, 20330067
  • Neuroeconomic studies on neurochemical bases of decision-making
    Grants-in-Aid for Scientific Research(若手研究(B))
    2008 - 2011
    Taiki TAKAHASHI
    Previous neuroeconomic studies employed neuroimaging techniques to examine economic decision-making processes in a manner which we can only see neural correlate of decision making processes. In this research project, we utilized psychophysical theory and quantum decision theory to extend neuroeconomic theories and elucidated molecular mechanism underlying economic decision making, which has been impossible by traditional neuroeconomic approaches.
    Ministry of Education, Culture, Sports, Science and Technology, 若手研究(B), 東京大学->北海道大学, Principal investigator, Competitive research funding, 20700236
  • ニューロエコノミクスの研究拠点形成に向けて:金融理論の基盤再考
    科学研究費補助金(萌芽研究, 挑戦的萌芽研究)
    2008 - 2009
    筒井 義郎; 大竹 文雄; 藤田 一郎; 晝間 文彦; 高橋 泰城
    時間割引は多くの経済実験において、少額を早く受け取るオプションと多額を遅く受け取るオプションのどちらを選択するか、というタスクで測定される。本研究課題は、(1)遅れ(現在から最初のオプションまでの時間)と期間(2つのオプションの間の時間)を明示的に分離して、それぞれが時間割引に与える効果を特定する、(2)喫煙が時間割引に対してもたらす効果について明らかにする、という2つの課題を主たる目的とする。(1)については、これまでに行った実験の結果を論文にまとめ、本年度6月にJournal of Risk and Uncertaintyに掲載した。(2)については、昨年度早稲田大学で行った、非喫煙者と喫煙者、断煙者と非断煙者を比較する実験の結果を分析した。その結果、喫煙者は非喫煙者に比べて高い時間割引を示すことが明らかにされた。また、断煙者は非断煙者よりも、お金に対しては高い割引率を示すが、タバコについては、むしろ忍耐強くなるという結果を得た。この後者の結果の頑健性については疑問があり、詳細な実験条件設定に問題がある可能性を検討して、それらを改良した実験を本年1月と2月に大阪大学において実施した。その結果は現在解析中であるが、おおむね、喫煙者は非喫煙者に比べて高い時間割引を示す点にでは早稲田実験と同じである。断煙者と非断煙者を比べると、お金については両者の時間割引には差がなく、タバコについては、断煙者の方がよりせっかちになるという結果が得られた。今年度の実験結果の方が直観に整合的であるが、両方の結果をどのようにまとめていくかは検討中である。一方、fMRI実験については、早稲田大学健康科学部の正木教授の協力が得られ、本年2月と3月に、異時点間選択を行っている喫煙者の脳画像を撮像した。引き続き、行動実験の結果をまとめつつ、断煙者および非喫煙者についても撮像していく。
    文部科学省, 萌芽研究, 挑戦的萌芽研究, 大阪大学, Coinvestigator not use grants, Competitive research funding, 20653017
  • 社会的認知・経済学的意思決定を制御する神経ホルモンの研究
    科学研究費補助金(萌芽研究)
    2005 - 2007
    高橋 泰城
    (1) 覚醒度に関連する神経ホルモンの唾液中アミラーゼや男性ホルモンのテストステロンが大きい時間割引率と関連する。(2) 時間割引の意思決定の際に知覚されている心理時間が、心理物理学で見出されている(スティーブンスのべき乗則というよりもむしろ)ウェーバー・フェヒナー則に従っていることにより、時間割引関数が(指数関数ではなく)双曲型関数によって記述されていることが考えられる。(3) 双曲型時間割引が、時間知覚に関連するドーパミン作動性神経回路の非シナプズ的電気的結合(ギャップジャンクション)によって担われているという可能性が考えられる(4) 時間割引の意思決定を、遅延報酬の受取人ではなく、ほかの人が代りにおこなうと、時間割引関数の双曲性(時間非整合性、非合理性)が強まってしまう(5) 意識下の感情が意思決定において重要な役割を果たすことを主張する「ソマティックマーカー仮説」の論拠となっているアイオワ・ギャンブリング課題における行動が、双曲型確率割引関数によって説明可能である(6) 時間割引や不確実性下の意思決定を記述する上で、Tsallis非加法的統計力学におけるq-指数関数が有効である(7) 喫煙者は、お金の分配における不平等性を嫌うほどには、タバコの分配の不平等性を嫌うわけではなく、依存性薬物と通常の報酬の価値判断を担う神経メカニズムが異なっている(8) 遅延報酬を手に入れることができる確率の主観的見積もりは、遅延時間の増加にともなって双曲型の減衰を示すが、時間割引が完全に不確実性回避に帰着されるわけではない(9) 結果の確率すら不明な不確実性下での意思決定は、結果の符号と大きさに依存し、従来提唱されてきた劣加法的主観確率仮説が完全に正しいわけではない
    文部科学省, 萌芽研究, 北海道大学->東京大学, Principal investigator, Competitive research funding, 17650074
  • 行動神経経済学
    2001
    Competitive research funding
  • 青春脳
    新学術領域
    文部科学省, Competitive research funding
■ Academic and Social Contribution Activities/Other
Social Contribution Activities
  • 内閣府 応用脳科学 コンソーシアム ＮＴＴデータ経営研究所 神経経済学 セミナーシリーズ
    Lecturer