Brain Science Institute consists of faculty members and research members of various colleges and research institutes in Tamagawa University. This page introduces the full-time staff members of Brain Science Institute.

Full-time Staff


Minoru Kimura    Professor, Ph.D

Systems Neuroscience / Integrated Brain Sciences

We are conducting neuroscience research on neuronal basis of decision-making and behavior selection in the basal ganglia. We investigate evaluative and learning functions of the basal ganglia, especially dopamine-dependent value update, in the striatum, and the behavioral selection functions of the thalamo-striatal system. We examine information processing by recording neuronal activity of behaving Japanese monkeys and rats, and by artificially manipulating specific neuronal circuit functions by using transgenic rats. We also investigate role of dopamine, amygdala and ventral striatum in decision-making under social environment (two human or monkey subjects participate) in terms of neuronal recording, functional brain imaging and computational theory.


Yoshikazu Isomura    Professor, Ph.D

Neuroscience / Neurophysiology

When animals behave voluntarily, neurons in the cerebral cortex and hippocampus show various forms of spike activity. However, the subtypes of neurons involved and how they interact are still not completely understood. Thus, we are attempting to clarify how information that is necessary in the selection, execution, and control of behavior is sent to neural circuits in the cerebral cortex and hippocampus of rodents, using behavioral and electrophysiological methods that we established originally.


Masamichi Sakagami    Professor, Ph.D

Neuroscience / Experimental Psychology

I am conducting research investigating the basic neural mechanism of decision-making and thinking by combining experimental psychology and neuroscientific methods. My experimental methodology is the use of neuron activity records and functional brain imaging (i.e., fMRI). In addition, I am discussing and carrying out collaborative research with economists and philosophers on how basic brain functions related to decision-making may be linked with complicated social brain functions (i.e., neuroeconomics and neuroethics).


Kenji Matsumoto    Professor, Ph.D

Cognitive Brain Science / Neuroeconomics / Systems Neuroscience

My challenge is to clarify the neural mechanisms of human agency from the view of goal-directed behavior, value representation, and motivation, by combining functional brain imaging with educational and social psychological methodologies. Some of my groundbreaking findings are highly regarded internationally.


Yutaka Sakai    Professor, Ph.D

Computational Theory / Computational Psychology

The brain is an excellent learning machine. Animals can learn appropriate behavior for various situations, although they have never experienced completely identical situation in their life. It implies that the brains can extract significant information for selection of behavior from huge sensory and stored information. The current computers can not yet do such excellent extraction of information. In order to clarify how animals can do, I am exploring the mechanisms of strange phenomena observed in brain and behavior of animals, from a view point of physics. I am tackling the unexplored topic of constructing a theoretical framework for learning mechanism of animals linking from neural systems to behavior.


Tetsuya Matsuda    Professor, Ph.D

Clinical Neuroscience / Psychiatric Neuroscience / Neurophysiology

I am conducting research related to the neural mechanisms of social decision-making using functional brain imaging, as well as psychological and physiological methodologies. First, I examine these mechanisms with basic neuroscience; then I take an approach that connects these findings with clinical research. In my clinical research, I investigate the relationship between the pathology of mental disorders and social decision-making impairment.


Kazuyuki Samejima    Associate Professor, Ph.D

Computational Neuroscience / Cognitive Neuroscience

My research goal is to know the nature of the intelligence from a theoretical point of view combined with neurophysiological methods in order to investigate brain functions. How are our behavioral choices optimized, and what do neural mechanisms contribute to the process? How do we explore actions, including behavioral repertoires, in novel environments? My approach for the research is to construct a mathematical model from an information-processing perspective in order to elucidate the neural mechanisms that create intelligence, by measuring neural activity during behaving animals and comparing it with computational models.


Ryoya Saji    Associate Professor, Ph.D

Developmental Brain Science

I am conducting developmental neurological research of infant. My goal is to gather behavioral observation surveys in the field while revealing the developmental mechanisms of the minds of infants using brain function measurement that mainly employs electroencephalogram method. I am also emphasizing pioneering educational practical activities in order to leverage the developmental neurological perspective I have gained through my research in the classroom.


Haruto Takagishi    Research Associate, Ph.D

Social Psychology / Developmental Psychology / Social Neuroscience

I am conducting research to clarify the psychological / neural basis of social behavior through experiments that combine economic games and functional brain imaging. I am also investigating the effect theory of mind have had on the development of altruistic behavior and sense of fairness via developmental psychology experiments with preschoolers and elementary school students.

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Contact: Office of Research Coordination +81-42-739-8666