Kazuyuki Samejima

Kazuyuki Samejima
Affiliation Tamagawa University Brain Science・Graduate School of Brain Sciences Institute
Position Title Associate Professor
Role Neural model approach to decision making and emotion
Research Keywords Decision making , Cognitive neuroscience, reinforcement learning , reward system
Professional Affiliation Society for neuroscience, Japan neural network society(JNNS), japan neuro science society (JNSS)


  • Neural correlates of cognitive dissonance and decision conflict, Izuma K., Matsumoto, M., Murayama, K., Samejima, K., Sadato, N., Matsumoto, K., Advances in Cognitive Neurodynamics (III), 2013, 623 - 628
  • Effects of depression on reward-based decision making and variability of action in probabilistic learning, Kunisato Y., Okamoto Y, Ueda Y., Onoda K., Okada G., Yoshimura S., Suzuki S., Samejima K., Yamawaki S., J. Beha. Ther. & Exp. Psychi.,, 2012, 43(4) , 1088 - 1094
  • Neurite outgrowth of PC12 cells on diX (parylene) family materials., , Hoshino T, Saito I, Takano H, Samejima K, Mabuchi K, Kato YX, Biotechnology progress, , 2012, 28, , 587 - 590
  • Improvement of neuronal cell adhesiveness on parylene with oxygen plasma treatment., Hoshino T, Saito I, Kometani R, Samejima K, Matsui S, Suzuki T, Mabuchi K, Kato YX, J Biosci & Bioeng, , 2012, 113 , 395 - 398
  • Photosensitive- polyimide based method for fabricating various neural electrode architectures, , Kato, Y.X., Furukawa, S., Samejima, K., Hironaka, N., Kashino, M., Front Neuroeng. , 2012, 5: 11. doi: 10.3389/fneng.2012.00011
  • Changing the structure of complex visuo-motor sequences selectively activates the fronto-parietal network, Pammi, V.S., Miyapuram, K.P., Samejima, K., Bapi, R.S., Doya, K., NeuroImage , 2012, 59(2), , 1180 - 1189
  • Stimulus-Dependent Adjustment of Reward Prediction Error in the Midbrain, Takemura, H., Samejima, K., Vogels, R., Sakagami, M., Okuda, J., PloS one , 2011, 6 (12), e28337
  • Neural correlates of cognitive dissonance and choice-induced preference change , Izuma, K., Matsumoto, M., Murayama, K., Samejima, K., Sadato, N., Matsumoto, K., Proc. Nat. Acad. of Sci. , 2010, 107 (51), , 22014
  • Estimating internal variables of decision maker’s brain: a model-based approach for neuroscience, , Samejima, K. and Doya, K., LNCS, , 2008, 4984, , 569 - 603
  • Multiple representations of belief states and action values in cortico-basal ganliga loops, Samejima K, and Doya K., Ann N Y Acad Sci , 2007, 104, 213 - 28
  • Efficient reinforcement learning: computational theories, neuroscience and robotics, Kawato M, and Samejima K., Curr Opin Neurobiol, 2007, 17, 205 - 212
  • Brain mechanism of reward prediction under predictable and unpredictable environmental dynamics, Tanaka SC, Samejima K, Okada G, Ueda K, Okamoto Y, Yamawaki S, and Doya K., Neural Netw, 2006, 19, 1233 - 1241
  • Representation of action-specific reward values in the striatum, Samejima K, Ueda Y, Doya K, and Kimura M., Science, 2005, 310, 1337 - 1340


  • Ch9, Model-based anlalysis of decision variables, In Decision making, Affect, and Learning , Doya, K., Ito, M., Samejima, K., Attention and Performance XXIII, pp.189-204, Oxford University Press, 2011

International Conferences

  • Nonomura, S., Kato, YX., Samejima, K., Doya, K., Tanji, J., Poster presentation, The anterior caudate nucleus contribute to comparison of reward values before motor choice in macaque monkey, Annual meeting of society for neuroeconomics, 2012/09
  • Nomura, I, Samejima K., Washida, Y., Ueda, K., Poster presentation, The effect of risk attitude on product choices, The annual meeting of cognitive science society (Cogsci 2011), 2011/07
  • Izuma, K., Matsumoto, M., Murayama, K., Samejima, k., Sadato,N, Matsumoto, K., Poster presentation, Neural Correlates of Cognitive Dissonance and Decision Conflict, International conference on cognitive neurodynamics (ICCN 2011), 2011/07
  • Izuma, K., Samejima, K, Poster presentation, Neural correlates of preference change and cognitive dissonance, Annual meeting of society for neuroscience 2010, 2010/11
  • Ueda Y, Samejima K, Yamanaka K, Doya K. & Kimura M, Poster presentation, Adaptation of reward-based free-choices is impaired by D1 but not D2 dopamine receptor antagonist in the striatum, The 38th annual meeting of Society for Neuroscience, , Washington DC, USA, , 2008/11/17

Domestic Conferences

  • Samejima, K., Neural basis of conditioning and reinforcement learning: A mechanistic perspective on learning and decision, 専修大学国際シンポジウム Expansion of associative learning theory, 2012/11
  • Nonomura, S, Kato, YX, Samejima, K., Doya, K., Tanji, J., Poster presentation, Neural activity in the anterior striatum during comparison of reward values, JNNS2011第21回 日本神経回路学会大会, 2011/12
  • 野村郁也,大貫泰,鮫島和行,鷲田祐一,植田一博,岡田浩之,大森隆司, Poster presentation, The effect of brand awareness and risk attitude on product choices, 脳と心のメカニズム第11回冬のワークショップ, 2011/01
  • Nonomura, S, Samejima, K, Doya, K., Tanji, J., Poster presentation, Neural activity in the dorsal striatum during cognitive decision making , Neuro 2010 (第33回 日本神経科学会大会, 第20回日本神経回路学会大会, 第53回日本神経化学会大会) , 2010/09
  • Yoshida, T., Ito, M., Morimura, T., Samejima K., Okuda, J., Yoshimoto, J., Doya, K., Poster presentation, Brain mechanisms for evaluating probabilistic and delayed rewards, Neuroscience 2009 (第32回 日本神経科学会大会), 2009/09
  • Samejima K, Guest lecture, Reinforcement learning hypothesis of cortico-basal ganglia loops and action value coding in the stiratum., Satellite Symposium of the 32nd Annual Meeting of the Japan Neuroscience Society, The Basal Ganglia in Health & Disease , 2009/09

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