猴子视觉皮层中颜色选择性神经元的宽带调谐色度输入。

Broad-tuned chromatic inputs to color-selective neurons in the monkey visual cortex.

Sato H, Katsuyama N, Tamura H, Hata Y, Tsumoto T

Department of Neurophysiology, Osaka University Medical School, Japan.

J Neurophysiol. 1994 Jul;72(1):163-8. doi: 10.1152/jn.1994.72.1.163.

Abstract

Input mechanisms of 21 color-selective cells in cytochrome oxidase-rich blobs in layer II/III of the anesthetized and paralyzed monkey primary visual cortex were studied by an iontophoretic administration of the GABAergic receptor antagonist bicuculline methiodide (BMI). 2. Color-selective blob cells become responsive to originally nonresponsive colors of stimuli or brightness contrast stimuli during removal of intracortical inhibition. 3. The magnitudes of the cells' responses to color stimuli during BMI administration were larger than the expected value of response calculated from the previously reported color tuning of color-selective geniculate cells and emission spectra of color stimulus. 4. These results suggest that color-selective blob cells receive a convergence of different types of chromatic inputs and that intracortical inhibition confers selectivity for a given color on them.

摘要

通过离子电渗法给予GABA能受体拮抗剂甲基荷包牡丹碱（BMI），研究了麻醉和麻痹的猴初级视觉皮层II/III层富含细胞色素氧化酶的小斑点中21个颜色选择性细胞的输入机制。2. 在去除皮质内抑制期间，颜色选择性斑点细胞对原本无反应的刺激颜色或亮度对比刺激产生反应。3. 在给予BMI期间，细胞对颜色刺激的反应幅度大于根据先前报道的颜色选择性膝状细胞的颜色调谐和颜色刺激的发射光谱计算出的预期反应值。4. 这些结果表明，颜色选择性斑点细胞接受不同类型的色觉输入的汇聚，并且皮质内抑制赋予它们对给定颜色的选择性。