Publications

Takayuki Tsurumi, Ayaka Kato, Arvind Kumar, & Kenji Morita
Learning of state representation in recurrent network: the power of random feedback and biological constraints. (Reviewed Preprint v1 Not revised)
eLife https://doi.org/10.7554/eLife.104101.1 (2025) [Link]

Kanji Shimomura & Kenji Morita
The effect of reward magnitude on different types of exploration in human reinforcement learning.
Computational Brain & Behavior https://doi.org/10.1007/s42113-024-00224-6 (2024) [Link]

Kanji Shimomura, Kenji Morita, Yuki Nishiguchi, Jeff C. Huffman, & Rachel A. Millstein
Intraindividual fluctuation in optimism under daily life circumstances: a longitudinal study.
Affective Science 5: 1-12 (2024) [Link]

Reo Sato^#, Kanji Shimomura^#, & Kenji Morita (^#: equal contribution)
Opponent learning with different representations in the cortico-basal ganglia pathways can develop obsession-compulsion cycle.
PLoS Computational Biology 19(6): e1011206. (2023) [Link]

Kenji Morita, Kanji Shimomura, & Yasuo Kawaguchi
Opponent learning with different representations in the cortico-basal ganglia circuits.
eNeuro 10(1) ENEURO.0422-22.2023 (2023) [Link]

Ayaka Kato, Kanji Shimomura, Dimitri Ognibene, Muhammad A. Parvaz, Laura A. Berner, Kenji Morita, & Vincenzo G. Fiore
Computational models of behavioral addictions: State of the art and future directions.
Addictive Behaviors 140:107595 (2023) [Link]

Sanghun Im, Yoshifumi Ueta, Takeshi Otsuka, Mieko Morishima, Mohammed Youssef, Yasuharu Hirai, Kenta Kobayashi, Ryosuke Kaneko, Kenji Morita, & Yasuo Kawaguchi
Corticocortical innervation subtypes of layer 5 intratelencephalic cells in the murine secondary motor cortex.
Cerebral Cortex 33(1):50–67 (2023). [Link]

Kenji Morita & Ayaka Kato
Dopamine ramps for accurate value learning under uncertainty.
Trends in Neurosciences 45(4):254-256 (2022). [Link] (Spotlight)

Zheyu Feng, Asako Mitsuto Nagase, & Kenji Morita
A reinforcement learning approach to understanding procrastination: does inaccurate value approximation cause irrational postponing of a task?
Frontiers in Neuroscience 15:660595 (2021). [Link]

Kanji Shimomura^#, Ayaka Kato^#, & Kenji Morita (^#: equal contribution)
Rigid reduced successor representation as a potential mechanism for addiction.
European Journal of Neuroscience 53(11):3768-3790 (2021). [Link]

Sai Tanimoto^#, Masashi Kondo^#, Kenji Morita, Eriko Yoshida, & Masanori Matsuzaki (^#: equal contribution)
Non-action learning: saving action-associated cost serves as a covert reward.
Frontiers in Behavioral Neuroscience 14:141 (2020). [Link]

Kenji Morita & Asako Mitsuto Nagase
Caution in exploring the effects of distant past outcomes on sequential choices.
Neuroscience Research 156:159-164 (2020). [Link]

Kenji Morita^#, Sanghun Im^#, & Yasuo Kawaguchi (^#: equal contribution)
Differential striatal axonal arborizations of the intratelencephalic and pyramidal-tract neurons: analysis of the data in the MouseLight database.
Frontiers in Neural Circuits 13:71 (2019). [Link]

Jerome Clifford Foo, Valentina Vengeliene, Hamid Reza Noori, Ikuhiro Yamaguchi, Kenji Morita, Toru Nakamura, Yoshiharu Yamamoto, & Rainer Spanagel
Drinking levels and profiles of alcohol addicted rats predict response to nalmefene.
Frontiers in Pharmacology 10:471 (2019). [Link]

Kenji Morita & Yasuo Kawaguchi
A dual role hypothesis of the cortico-basal-ganglia pathways: opponency and temporal difference through dopamine and adenosine.
Frontiers in Neural Circuits 12:111 (2019). [Link]

Ryota Nomura, Ying-Zong Liang, Kenji Morita, Kantaro Fujiwara, & Tohru Ikeguchi
Threshold-varying integrate-and-fire model reproduces distributions of spontaneous blink intervals.
PLoS One 13(10):e0206528 (2018). [Link]

Asako Mitsuto Nagase, Keiichi Onoda, Jerome Clifford Foo, Tomoki Haji, Rei Akaishi, Shuhei Yamaguchi, Katsuyuki Sakai, & Kenji Morita
Neural mechanisms for adaptive learned avoidance of mental effort.
The Journal of Neuroscience 38(10):2631-2651 (2018). [Link]

Kenji Morita & Ayaka Kato
A neural circuit mechanism for the involvements of dopamine in effort-related choices: decay of learned values, secondary effects of depletion, and calculation of temporal difference error.
eNeuro 5(1) pii: ENEURO.0021-18.2018 (2018). [Link]

Jerome Clifford Foo, Hamid Reza Noori, Ikuhiro Yamaguchi, Valentina Vengeliene, Alejandro Cosa-Linan, Toru Nakamura, Kenji Morita, Rainer Spanagel, & Yoshiharu Yamamoto
Dynamical state transitions into addictive behaviour and their early-warning signals.
Proceedings of the Royal Society B: Biological Sciences 284(1860) pii: 20170882 (2017). [Link]

Jerome C. Foo, Kohei Nagase, Sawako Naramura-Ohno, Kazuhiro Yoshiuchi, Yoshiharu Yamamoto, & Kenji Morita
Rank among peers during game competition affects the tendency to make risky choices in adolescent males.
Frontiers in Psychology 8:16 (2017). [Link]

Ayaka Kato & Kenji Morita
Forgetting in reinforcement learning links sustained dopamine signals to motivation.
PLoS Computational Biology 12(10):e1005145 (2016). [Link]

Kenji Morita, Jenia Jitsev, & Abigail Morrison
Corticostriatal circuit mechanisms of value-based action selection: Implementation of reinforcement learning algorithms and beyond.
Behavioural Brain Research 311:110-21 (2016). [Link]

Kenji Morita & Yasuo Kawaguchi
Computing reward-prediction error: an integrated account of cortical timing and basal-ganglia pathways for appetitive and aversive learning.
European Journal of Neuroscience 42(4):2003-21 (2015). [Link]

Kenji Morita & Ayaka Kato
Striatal dopamine ramping may indicate flexible reinforcement learning with forgetting in the cortico-basal ganglia circuits.
Frontiers in Neural Circuits 8:36. doi: 10.3389/fncir.2014.00036 (2014). [Link] <Corrigendum>

Kenji Morita
Differential cortical activation of the striatal direct and indirect pathway cells: reconciling the anatomical and optogenetic results by using a computational method.
Journal of Neurophysiology 112(1):120-46 (2014). [Link]

Kenji Morita, Mieko Morishima, Katsuyuki Sakai, & Yasuo Kawaguchi
Dopaminergic control of motivation and reinforcement learning: a closed-circuit account for reward-oriented behavior.
The Journal of Neuroscience 33(20):8866-8890 (2013). [Link]

Xiumin Li, Kenji Morita, Hugh P. C. Robinson, & Michael Small
Control of layer 5 pyramidal cell spiking by oscillatory inhibition in the distal apical dendrites: a computational modelling study.
Journal of Neurophysiology 109(11):2739-2756 (2013). [Link]

Tae Twomey, Keith J. Kawabata Duncan, John S. Hogan, Kenji Morita, Kazumasa Umeda, Katsuyuki Sakai, & Joseph T. Devlin
Dissociating visual form from lexical frequency using Japanese.
Brain & Language 125(2):184-93 (2013). [Link]

Kenji Morita, Mieko Morishima, Katsuyuki Sakai, & Yasuo Kawaguchi
Reinforcement learning: computing the temporal difference of values via distinct corticostriatal pathways.
Trends in Neurosciences 35(8):457-467 (2012). [Link] <Correction>

Xiumin Li, Kenji Morita, Hugh P. C. Robinson, & Michael Small
Impact of gamma-oscillatory inhibition on the signal transmission of a cortical pyramidal neuron.
Cognitive Neurodynamics 5:241–251 (2011). [Abstract]

Mieko Morishima, Kenji Morita, Yoshiyuki Kubota, & Yasuo Kawaguchi
Highly differentiated projection-specific cortical subnetworks.
The Journal of Neuroscience 31(28):10380-10391 (2011). [Abstract]

Kenji Morita
Possible dendritic contribution to unimodal numerosity tuning and Weber-Fechner law-dependent numerical cognition.
Frontiers in Computational Neuroscience 3:12 (2009). [Abstract] [Full-text]

Kenji Morita
Dynamical foundations of the neural circuit for Bayesian decision making.
Journal of Neurophysiology 102(1):1-6 (2009). [Abstract] [Full-text] (Neuro Forum)

Kenji Morita
Computational implications of cooperative plasticity induction at nearby dendritic sites.
Science Signaling 2(52):pe2 (2009). [Abstract] [Full-text: Please visit my old website] (Perspectives)

Kenji Morita
Possible role of dendritic compartmentalization in the spatial working memory circuit.
The Journal of Neuroscience 28(30):7699-7724 (2008). [Abstract] [Full-text]

Kenji Morita, Rita Kalra, Kazuyuki Aihara, & Hugh P. C. Robinson
Recurrent synaptic input and the timing of gamma-frequency-modulated firing of pyramidal cells during neocortical “UP” states.
The Journal of Neuroscience 28(8):1871-1881 (2008). [Abstract] [Full-text]

Kenji Morita, Masato Okada, & Kazuyuki Aihara
Selectivity and stability via dendritic nonlinearity.
Neural Computation 19(7):1798-1853 (2007). [Abstract]

Hiroyuki Nakahara, Kenji Morita, Robert H. Wurtz, & Lance M. Optican
Saccade-related spread of activity across superior colliculus may arise from asymmetry of internal connections.
Journal of Neurophysiology 96(2):765-774 (2006). [Abstract] [Full-text]

Kenji Morita, Kunichika Tsumoto, & Kazuyuki Aihara
Bidirectional modulation of neuronal responses by depolarizing GABAergic inputs.
Biophysical Journal 90(6):1925-1938 (2006). [Abstract] [Full-text]

Kenji Morita, Kunichika Tsumoto, & Kazuyuki Aihara
Possible effects of depolarizing GABA_A conductance on the neuronal input-output relationship: a modeling study.
Journal of Neurophysiology 93(6):3504-3523 (2005). [Abstract] [Full-text]

Kenji Morita & Kazuyuki Aihara
A network model with pyramidal cells and GABAergic non-FS cells in the cerebral cortex.
Neurocomputing 65-66:697-707 (2005).

Ko Kobayakawa, Reiko Hayashi, Kenji Morita, Kazunari Miyamichi, Yuichiro Oka, Akio Tsuboi, & Hitoshi Sakano
Stomatin-related olfactory protein, SRO, specifically expressed in the murine olfactory sensory neurons.
The Journal of Neuroscience 22(14):5931-5937 (2002). [Abstract] [Full-text]

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