第29回日本神経科学大会(京都)
平成18年7月19日〜21日
Program Number: PS3A-F100 Presentation Time: Friday, July. 21, 11:00 - 12:00

Firing statistics and stimulus selectivity of inferior temporal cortical neurons in the monkey

Shunta Tate1,2, Hiroshi Tamura1,3, Ichiro Fujita1,3

1Graduate School of Frontier Biosciences, Osaka University, Osaka, Japan, 2JSPS, Japan, 3CREST, JST, Japan

Inferior temporal (IT) cortical cells are selective for visual shape, and vary in their spontaneous firing pattern among them. Cluster analysis indicated that IT cells were classified into five groups based on inter-spike interval (ISI) histograms of their spontaneous firing. The first two groups showed a single peak at a long or a short ISI in ISI histograms. The other three had multiple peaks, whose positions and relative heights varied among the groups. Principal component analysis and other analyses of visual responses showed that the five groups differed in their stimulus selectivity for a predetermined set of visual stimuli. Stimulus selectivity was sharper in the single-peak groups than in the multiple-peak groups. One of the single-peak groups was modulated by natural images more strongly than the other groups. The results suggest that cells with different firing patterns carry different aspects of visual information, and may perform different functions in the coding of visual object images. Supported by JSPS and CREST.

Keywords: INFERIOR TEMPORAL CORTEX, CELL CLASIFICATION, STIMULUS SELECTIVITY, INTER SPIKE INTERVAL

Reserch Funds: KAKENHI16-07757