INHIBITORY REFINEMENT OF SPATIAL-FREQUENCY SELECTIVITY IN SINGLE CELLS OF THE CAT STRIATE CORTEX
INHIBITORY REFINEMENT OF SPATIAL-FREQUENCY SELECTIVITY IN SINGLE CELLS OF THE CAT STRIATE CORTEX
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DOI：
10.1016/0042-6989(91)90201-f
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发表时间：
1991-01-01
期刊：
影响因子：
1.8
通讯作者：
BONDS, AB
中科院分区：
文献类型：
--
作者：
BAUMAN, LA;BONDS, AB
猫纹状皮质中的单个细胞对正弦波栅刺激的空间频率比视网膜或外侧膝状核中的细胞更具选择性。我们探索了这种选择性的增强是空间频率选择性抑制的可能性。用两个叠加的栅格刺激，一个用来刺激细胞，另一个用来探测抑制，结果显示74%的受试者空间频率相关的反应受到抑制。抑制在简单细胞中(80%)略高于复杂细胞(68%)。在发现抑制的93%的情况下，其调谐与兴奋性空间频率调谐是互补的，并且通常在兴奋性调谐函数接近零im./s时发现最强的抑制。这一现象的特征与皮层无关。我们得出结论，有组织的抑制机制有助于改善纹状皮质细胞的空间频率带通。这为皮层感受野的组织结构提供了另一种程度的非线性证据，并支持了视觉皮质的基本功能是在空间频率域中进行图像分离的假设。
Single cells in the cat striate cortex are more selective for the spatial frequency of sinewave grating stimuli than are cells of the retina or lateral geniculate nucleus. We have explored the possibility that this enhancement of selectivity results from spatial-frequency-selective inhibition. Stimulation with two superimposed gratings, one to excite the cell and one to probe for inhibition, revealed spatial frequency-dependent response suppression in 74% of the total population studied. Suppression was slightly more prevalent in simple cells (80%) than in complex cells (68%). In 93% of the cases where suppression was found, its tuning was complementary to excitatory spatial frequency tuning, and the strongest suppression was usually found where the excitatory tuning function approached zero imp./sec. Characteristics of the phenomenon were independent of cortical layers. We conclude that organized inhibitory mechanisms serve to refine the spatial frequency bandpass of striate cortical cells. This provides evidence for another degree of nonlinearity in the organization of cortical receptive fields and supports the hypothesis that a fundamental function of the visual cortex is image dissection in the domain of spatial frequency.