Keigo Inukai

Institute of Social and Economic Research
Osaka University

I am currently assistant professor in the Institute of Social and Economic Research at Osaka University, within Research Center for Behavioral Economics, and Center for Information and Neural Networks.


Address: 6-1, Mihogaoka, Ibaraki, Osaka, 567-0047, Japan.

Phone: +81-6-6879-8577

Research Topics

Experimental Economics

Experimental economics is the fields of studying economic questions using experimental methods.

Decision Theory

Decision Theory is concerned with identifying the values, uncertainty and ambiguity in a given decision.

Behavioral Game Theory

Behavioral game theory is the filed of explaining the actual human behaviors under game theoritic situations.


Neuroeconomics is a field that seeks to explain economic decision making processes using fMRI, EEG and neuroendocrinological methods.

Political Economics

I am interested in explaining voting behaviors, political processes and political game theory.


Experimetrics refers to the application of econometrics to economic experiment and behavioral science.


Chuo University, BA., 2005 (Political Science and Policy Studies)

Hokkaido University, MA., 2007 (Behavioral Science)

Hokkaido University, Ph.D., 2011

Professional Experience

Assistant Professor, Institute of Social and Economic Research, Osaka University, 2013-

Postdoctoral fellow, Department of Economics, Hokkaido University, 2011-2013

Recent Research

"The effect of market exchange on the devision of labour." (with Harris, J., Kurosaka, K., and Simiao, L.)

"Efficiency, equity and inequality aversion: The experimental study of distributive justice." (with Kameda, T.)

"The strategic behaivior and learning: The case of strategic voting."

"Being in the shoes of a social planner can foster civil minds: Distributive justice and the free-rider problem in public goods provision." (with Berg, N., Kurosaka, K., and Kameda, T.)


Horita, Y., Takezawa, M., Inukai, K., Kita, T., & Masuda, N. (2017). Reinforcement learning accounts for moody conditional cooperation behavior: experimental results. Scientific Reports, 7, 39275.

Kameda, T., Inukai, K., Higuchi, S., Ogawa, A., Kim, H., Matsuda, T., & Sakagami, M. (2016). Rawlsian maximin rule operates as a common cognitive anchor in distributive justice and risky decisions. PNAS, 113(42), 11817-11822.

Duttle, K. & Inukai, K. (in press). Implications from biased probability judgments for international disparities in momentum returns. Journal of Behavioral Finance.

Duttle, K. & Inukai, K. (2015). Complexity aversion: Influences of cognitive abilities, culture and system of thought. Economics Bulletin, 35(2). 846-865.

Kameda, T., Inukai, K., Wisdom, T., & Toyokawa, W. (2015). Herd behavior: Its psychological and neural underpinnings. In S. Grundmann, F. Moeslein & K. Riesenhuber (Eds.), Contract Governance. UK: Oxford University Press.

Yamagishi, T., Mifune, N., Li, Y., Shinada, M., Hashimoto, H., Horita, Y., Miura, A., Inukai, K., Tanida, S., Kiyonari, T., Takagishi, H., & Simunovic, D. (2013). Is behavioral pro-sociality game-specific? Pro-social preference and expectations of pro-sociality. Organizational Behavior and Human Decision Processes, 120(2), 260-271.

Yamagishi, T., Horita. Y., Mifune, N., Hashimoto, H., Li, Y., Shinada, M., Miura, A., Inukai, K., Takagishi, H., & Simunovic, D. (2012). Rejection of unfair offers in the ultimatum game is no evidence of strong reciprocity. PNAS, 109(50) 20364-20368.

Kameda, T., Wisdom, T., Toyowaka, W., & Inukai, K. (2012). Is consensus-seeking unique to humans? A selective review of animal group decision-making and its implications for (human) social psychology. Group Processes and Intergroup Relations. 15(5), 673-689.

Kameda, T., Murata, A., Sasaki, C., Higuchi, S., & Inukai, K. (2012). Empathizing with a dissimilar other: The role of self-other distinction in sympathetic responding. Psrsonality and Social Psychology Bulletin, 38(8), 997-1003.


Hizen, Y., Inukai, K., & Kurosaka, K. (2012). Duverger's law and laboratory experiments. In H. Konishi (Eds.), Seiji-Keizaigaku-no-Shin-Chouryuu. Tokyo: Keiso Shobo. (in Japanese).

Yamagishi, T., Hashimoto, H., Cook, K.S., Kiyonari, T., Shinada, M., Mifune, N., Inukai, K., Takagishi, H., Horita, Y., & Li, Y. (2011). Modesty in self-presentation: A comparison between the USA and Japan. Asian Journal of Social Psychology, 15(1), 60-68.

Inukai, K., Shinada, M., Tanida, S., Takahashi, C., Mifune, N., Takagishi, H., Horita, Y., Hashimoto, H., Yokota, K., Kameda, T., Yamagishi, T., & Takahashi, T. (2010). Salivary alpha-amylase levels and big five personality factors in adults. Neuroendocrinology Letters, 31(6), 771-774.

Takagishi, H., Takahashi, T., Yamagishi, T., Shinada, M., Inukai, K., Tanida, S., MIfune, N., Horita, Y., Hashimoto, H., Yang, Y., & Kameda, T. (2010). Salivary testosterone levels and autism-spectrum quotient in adults. Neuroendocrinology Letters, 31(6), 837-841.

Takahashi, T., Shinada, M., Inukai, K., Tanida, S., Takahashi, C., Mifune, N., Takagishi, H., Horita, Y., Hashimoto, H., Yokota, K., Kameda, T., & Yamagishi, T. (2010). Stress hormones predict hyperbolic time-discount rates six months later in adults. Neuroendocrinology Letters, 31(5), 616-621.

Shinada, M., Yamagishi, T., Tanida, S., Takahashi, C., Inukai, K., Koizumi, M., Yokota, K., Mifune, N., Takagishi, H., Horita, Y. & Hashimoto, H. (2010). Accuracy of judgment about others' cooperative behavior: effects of attractiveness and facial expressiveness. Japanese Psychological Research, 81(2), 149-157. (in Japanese)

Inukai, K., & Takahashi, T. (2009). Decision under ambiguity: Effects of sign and magnitude. International Journal of Neuroscience.119(8), 1170-1178.

Kameda, T., Ishibashi, N., Inukai, K., & Iwabuchi, M. (2007). "Mind" as adaptive systems: Social psychology and game theory, Economic Seminar (in Japanese).

Inukai, K. & Takahashi, T. (2006). Distinct neuropsychological processes may mediate decision-making under uncertainty with known and unknown probability in gain and loss frames. Medical Hypotheses, 67(2), 283-286.


2006 JSSP Young Researcher's Scholarship (Japanese Society of Social Psychology)


  • Java
  • Objective C
  • C++

Membersip of Professional Organizations

  • Economic Science Associations
  • The Japanse Society of Social Psychology
  • The Japan Public Choice Society
  • Human Behavior & Evolutionary Society of Japan

Keigo Inukai —