Hi, I'm Ayaka Kato (加藤 郁佳), a research associate at RIKEN Center for Brain Science and a Ph.D. student at the University of Tokyo in Japan.
I have been studying the neural mechanism of motivation and addiction.
KEYWORDS: Neuroscience, Dopamine, Reinforcement learning, Digital therapeutics, Addiction, Computational Psychiatry, Open Science
Morita, K., & Kato, A. (2022). Dopamine ramps for accurate value learning under uncertainty. Trends in Neurosciences.
Shimomura, K., Kato, A., & Morita, K. (2021). Rigid reduced successor representation as a potential mechanism for addiction. The European Journal of Neuroscience, 53(11), 3768.
Kario, K., Nomura, A., Kato, A., Harada, N., Tanigawa, T., So, R., ... & Satake, K. (2021). Digital therapeutics for essential hypertension using a smartphone application: A randomized, open‐label, multicenter pilot study. The Journal of Clinical Hypertension, 23(5), 923-934.
Kato, A., Kunisato, Y., Katahira, K., Okimura, T., & Yamashita, Y. (2020). Computational Psychiatry Research Map (CPSYMAP): a new database for visualizing research papers. Frontiers in Psychiatry, 11, 1360.
Kato, A., & Morita, K. (2020). Dynamical Systems Approach: An Elementary Introduction and Application to Research on Dopamine and Reinforcement Learning. Brain and Nerve= Shinkei Kenkyu no Shinpo, 72(11), 1275-1282.
Kato A, Tanigawa T, Satake K, Nomura A (2020) Efficacy of the Ascure Smoking Cessation Program: Retrospective Study JMIR Mhealth Uhealth 2020;8(5):e17270
Morita K & Kato A (2018) 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, ENEURO-0021.
Kato A & Morita K (2016) Forgetting in Reinforcement Learning Links Sustained Dopamine Signals to Motivation. PLoS Comput Biol 12(10): e1005145. doi:10.1371/journal.pcbi.1005145
Morita K and Kato A (2014) Striatal dopamine ramping may indicate flexible reinforcement learning with forgetting in the cortico-basal ganglia circuits. Front. Neural Circuits 8:36. doi: 10.3389/fncir.2014.0003
Click the figures to access the papers
2017.4 - current
The University of Tokyo
Laboratory for Circuit Mechanisms of Sensory Perception @ RIKEN CBS
Supervised by Dr. Hokto Kazama / Skills: Ca2+ imaging
2017.9 - 2018.9
MSc in Neuroscience, Graduate Programme in Neuroscience,
University of Oxford
1st dissertation: Human TMS & MEG project - advisor: Dr. Matthew Rushworth
2nd dissertation: Rodent dopamine juxtacellular recording project-advisor: Dr. Peter Magill
2015.4 - 2017.3
MSc, Department of Biological Sciences, Graduate School of Science,
The University of Tokyo advisor: Dr. Yasuo Ihara / Skills: MATLAB Programing, Multi-agent simulation, Genetic Algorism
2011.4 - 2015.3
BSc, Department of Biological Sciences, School of Science,
The University of Tokyo advisor: Dr. Takeo Kubo and Dr. Hideaki Takeuchi / Skills: Wavelet analysis, CRISPR-Cas9
Awards and Grants
Presentations and invited talks
Kato A & Kazama H Encoding of innate values of odors by dopaminergic neurons. The 43rd Annual Meeting of the Japan Neuroscience Society 07/2020
Ayaka Kato, Tomoyuki Tanigawa, Kohta Satake, Akihiro Nomura EFFICACY OF THE NOVEL DIGITAL ASCURE SMOKING CESSATION PROGRAM COMBINING SMARTPHONE APP AND WEB BASED MENTORING Poster-> https://cureapp.institute/resource/img/pdf/SNRT_abstract.pdf
Society for Research on Nicotine & Tobacco (SRNT) 25th Annual Meeting San Francisco, California USA, February 2019
Kato A & Morita K Forgetting in reinforcement learning reconciles the two roles of dopamine: reward prediction error and motivational drive (633.06.)
Society for neuroscience San Diego USA 11/2016
Itoh T*, Ukita J*, Kato A* *Equal contribution Modeling the development of place cells in hippocampus.
Annual International Conference on Biologically Inspired Cognitive Architectures Lyon France 11/2015
Kato A & Morita K Potential mechanistic account for the suggested relationship between the ramping dopamine signal and sustained motivational drive: a study of reinforcement learning model.
doi: 10.12751/nncn.bc2015.0095 Bernstein Conference Heidelberg Germany 09/2015
Kato A & Morita K
Exploring models of reinforcement learning to explain the ramping DA signal in the striatum.
The 37th Annual Meeting of the Japan Neuroscience Society, Yokohama Japan 09/2014
2018.10 - 2021.3
Researcher -- CureApp Inc
Project: Evaluating the efficacy of the Ascure Smoking Cessation Program
Skills: R, Logistic regression, Academic writing
2018.12 - 2019.3
Research assistant - UTEC (Venture Capital)
2018.2 - 2018.6
Internship in R&D sector -- Araya (Japanese startup)
Project: Exploratory research on how to utilize Phi-tool box https://figshare.com/articles/phi_toolbox_zip/3203326
Skills: MATLAB, Analyzing Network
2015.11 – 2016.3
Internship in R&D sector -- Colorful Board (Japanese startup)
Project: Visualizing user’s fashion preference for personalized recommendation system
Skills: Python, Natural language processing (Word2Vec)
2015.8 – 2016.2
Hackathon winner -- Whole Brain Architecture Hackathon in Tokyo
Project: Developing an agent exploring novel virtual space by self-localization and mapping
Skills: Python, recurrent neural network (LSTM)
2013.8 – 2018.2
Research Assistant -- University of Tokyo (Supervisor: Dr. Kenji Morita)
Project: Computational modeling of motivation as reinforcement learning with forgetting
Skills: MATLAB Programing, Reinforcement learning, Nonlinear dynamics