MAJIMA Kei
Specially Appointed Associate Professor
Neural decoding: Reading thoughts from brain activity
Department of Biological Sciences, Behavioral Neurobiology

| Theme | Development of methods for neural decoding and their applications in neuroscience |
| Field | Neuroscience, Machine learninig, Quantum computation |
| Keyword | Neural decoding, Brain decoding, Machine learning, AI, Multivariate analysis, Quantum computation, Quantum algorithm, Quantum machine learning, Combinatorial optimization, Quantum annealing, Black-box optimization, Vision, Sparse estimation, Bayesian estimation |
Introduction of Research
My research focuses on "neural decoding technologies," which aim to read out perceptions, memories, and motor intentions from the brain. Specifically, I specialize in developing the software and statistical methodologies required for this decoding process. As an example, in 2024, we demonstrated that images imagined in the human mind can be reconstructed from brain signals measured by fMRI (Figure 1), although improving the reconstruction accuracy remains an ongoing goal. While my previous work has primarily involved humans, at Hokkaido University, I plan to collaborate with students and researchers at the Faculty of Science to expand the scope of my research to include animal models.
Through the development of these neural decoding methodologies, I am also integrating relatively new computational technologies that can accelerate computation, such as quantum computing, quantum-inspired algorithms, and quantum annealing. By leveraging these cutting-edge tools, I aim to achieve scalable processing of large-scale neural data (Figure 2).
Representative Achievements
| Self Introduction | My primary affiliation is with the National Institutes for Quantum Science and Technology (QST), but I have also joined Hokkaido University under a cross-appointment to conduct research for the JST BOOST program. I’m still new to life in Hokkaido, and I am very much looking forward to working and researching in the beautiful natural surroundings of Hokkaido University. |
| Academic background | 2009 B.Sc., Faculty of Science, Kyoto University 2011 M.S., Graduate School of Information Science, Nara Institute of Science and Technology (NAIST) 2014 Ph.D., Graduate School of Information Science, Nara Institute of Science and Technology (NAIST) 2014 Researcher, ATR Computational Neuroscience Laboratories 2015 Assistant Professor, Graduate School of Informatics, Kyoto University 2020 Researcher, National Institutes for Quantum Science and Technology (QST) 2021 PRESTO Researcher, Japan Science and Technology Agency (JST) 2025- Senior Researcher, National Institutes for Quantum Science and Technology (QST) 2026- Specially Appointed Associate Professor, Faculty of Science, Hokkaido University |
| Affiliated academic society | Japanese Neural Network Society, Japan Neuroscience Society, Quantum Life Science Society |

