Principal investigators

Izumi Ohzawa

Visual Neuroscience

Main Lab Location:

CiNet (Main bldg.)

Other Affiliations:

Professor, Graduate School of Frontier Biosciences, Osaka University, Professor, School of Engineering Science, Osaka University





Mailing Address:

1-4 Yamadaoka, Suita City Osaka, 565-0871


ohzawa at


My research focuses on understanding how visual information is encoded in early stages of processing by the cerebral cortex.

We tend to think of visual information as a series of large pictures that are changing constantly. However, each of individual neurons in the brain can represent only a tiny fraction of that massive stream of incoming information. Exactly what fraction is it, and how all those factions are combined to enable recognition of complex objects and scenes?

In my primary research, activities of individual neurons are recorded directly by an array of microelectrodes or optical methods to relate them to visual input from the two eyes. Various visual patterns are generated on computer displays and resulting responses of neurons are analyzed using advanced techniques.

This type of research is important because higher parts of the brain depend on information from the early part of the visual cortex, the visual front-end processing. Fruits from our research and others have been incorporated in many artificial vision systems.

I am extending my approach to other visual areas that receive information from V1, the primary visual cortex.

Selected Publications:

Ninomiya T, Sanada TM, Ohzawa I. Contributions of excitation and suppression in shaping spatial frequency selectivity of V1 neurons as revealed by binocular measurements Journal of Neurophysiology, 107:2220-2231, (2012)

Sasaki KS, Tabuchi Y, Ohzawa I. Complex cells in the cat striate cortex have multiple disparity detectors in the 3D binocular receptive fields. Journal of Neuroscience, 30: 13826-13837, (2010)

Nishimoto S, Ishida T, Ohzawa I. Receptive field properties of neurons in the early visual cortex revealed by local spectral reverse correlation Journal of Neuroscience 26: 3269-3280, (2006)

Short Biography:

1978 B.S. in Electrical Engineering, Nagoya University
1986 Ph.D. in Physiological Optics (Vision Science), University of California, Berkleley
2000 Professor, Graduate School of Engineering Science, Osaka University
2002~ Professor, Graduate School of Frontier Bioscences, Osaka University

Lab Members:

・Kota S. Sasaki
・Ken-ichi Okada