P 1-260 Color selectivity and functional connectivity of macaque V 1 neurons: simultaneous recording from adjacent cells
Hirofumi Murakami1, Hiroshi Morimoto2, Hiroshi Tamura1, Ichiro Fujita1
1.Grad Sch Frontier Biosciences, Osaka Univ, Osaka, Japan, 2.Grad Sch Engineering Science, Osaka Univ, Osaka, Japan
Preferred colors of V 1 cells as a population cover a wide range across different chromaticities, while those of LGN cells are confined to the red-green and blue-yellow axes in the color space. It is unclear how this change in color representation occurs. In order to address this question, we studied the local clustering and neuronal connections of color-selective V 1 cells by recording visual responses simultaneously from multiple adjacent cells in the macaque monkey. Adjacent color-selective cells tended to prefer a similar color. No evidence, however, was obtained that cells with similar color selectivity form columnar clustering. A pair of adjacent cells with a common input had a tendency to have similar preferred colors, while a pair having an inhibitory connection had different preferred colors. The results suggest that neuronal interactions among adjacent cells contribute to color selectivity of V 1 cells.
2004 Elsevier Science Ireland Ltd. and the Japan Neuroscience Society. All rights reserved.