We have proposed mathematical models of the hippocampus. Our interest is functions of those hippocampal neural networks and mechanisms of those functions. We hypothesize that the dentate gyrus works as a gate for incoming information and the CA3-CA1 network works as a memory system. Our neural network model of the dentate gyrus selects synchronized spikes in the certain frequency range. Further, we have proposed that the dynamical behavior in the CA3 neural network model potentially contributes to the long-term potentiation of excitatory synapses in the CA1 neural network.

We are developing a chemical sensor array inspired by mouse taste buds. Our sensory system detects concentration of a chemical substance as the degree of synchronization of neural activity. Receptive membranes in the sensor array differ in sensitivity to a chemical substance. Output of that sensor array causes synchronization of bursts in uncoupled non-identical output cells.

Rhythmical activity of the neural circuit is one of our research interests. When the brain is a functional state, rhythmical activity appears in the neural circuit. Then, our interest is how the rhythmic neural activity contributes to information processing. In addition, we are doing research on the excitation wave of the heart muscle.

We are developing a digital neuron using Field Programmable Gate Array (FPGA).