SELECTIVITY FOR ORIENTATION AND DIRECTION OF MOTION OF SINGLE NEURONS IN CAT STRIATE AND EXTRASTRIATE VISUAL-CORTEX
SELECTIVITY FOR ORIENTATION AND DIRECTION OF MOTION OF SINGLE NEURONS IN CAT STRIATE AND EXTRASTRIATE VISUAL-CORTEX
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DOI：
10.1152/jn.1990.63.6.1529
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发表时间：
1990-06-01
影响因子：
2.5
通讯作者：
MOVSHON, JA
中科院分区：
文献类型：
--
作者：
GIZZI, MS;KATZ, E;MOVSHON, JA
1.我们认为，大多数皮层神经元所表现出的方向选择性的后果，他们可以传达有关刺激运动方向的信号的性质。在理论上，我们区分组件方向的选择性，其中细胞是选择性的复杂刺激的定向组件的运动方向，从模式方向的选择性，或选择性的整体方向的运动模式，而不管其组件的方向。我们采用了一种新的测试，使用光栅和格子目标来区分这些形式的方向选择性。2.我们研究了280个细胞从纹状体皮层和107个细胞从外侧上大脑皮层（LS）的单正弦光栅，以确定其方向偏好和方向选择性的反应。我们测试了73这些正弦格子，由两个正弦光栅在不同的方向，研究组织的方向机制内的感受野。3.当用单个光栅测试时，区域17中的277个定向单元的定向调谐具有20.6度的平均半宽度、接近13度的模式和3.8-58度的范围。简单的细胞比复杂的细胞稍微更窄的调整。LS神经元对光栅运动方向的选择性与17区神经元无明显差异。平均方向半宽为20.7度。4.我们评估了这些神经元的方向选择性，通过比较在最佳方向移动的刺激与在相反方向移动的刺激引起的反应。在第17区，大约三分之二的神经元对非偏好方向的反应不及偏好方向的一半;五分之二的神经元对偏好方向的反应也不及五分之一。复杂的细胞比简单的细胞表现出更大的方向偏向性。LS神经元在对移动光栅的反应中往往具有更强的方向不对称性：83%的LS神经元表现出显着的方向不对称性。5.这两个区域的神经元对格子图案的每个组成部分都有独立的反应。因此，细胞给出的单瓣方向调谐曲线光栅显示双叶格子调谐曲线，与每个波瓣对应的运动在一个有效的方向上的两个组成部分光栅在格子内。格子的两个最佳方向是当单独呈现时一个或另一个单个光栅将产生最佳响应的方向。（400字处截断摘要）
1. We consider the consequences of the orientation selectivity shown by most cortical neurons for the nature of the signals they can convey about the direction of stimulus movement. On theoretical grounds we distinguish component direction selectivity, in which cells are selective for the direction of movement of oriented components of a complex stimulus, from pattern direction selectivity, or selectivity for the overall direction of movement of a pattern irrespective of the directions of its components. We employed a novel test using grating and plaid targets to distinguish these forms of direction selectivity. 2. We studied the responses of 280 cells from the striate cortex and 107 cells from the lateral suprasylvian cortex (LS) to single sinusoidal gratings to determine their orientation preference and directional selectivity. We tested 73 of these with sinusoidal plaids, composed of two sinusoidal gratings at different orientations, to study the organization of the directional mechanisms within the receptive field. 3. When tested with single gratings, the directional tuning of 277 oriented cells in area 17 had a mean half width of 20.6 degrees, a mode near 13 degrees, and a range of 3.8-58 degrees. Simple cells were slightly more narrowly tuned than complex cells. The selectivity of LS neurons for the direction of moving gratings is not markedly different from that of neurons in area 17. The mean direction half width was 20.7 degrees. 4. We evaluated the directional selectivity of these neurons by comparing responses to stimuli moved in the optimal direction with those elicited by a stimulus moving in the opposite direction. In area 17 about two-thirds of the neurons responded less than half as well to the non-preferred direction as to the preferred direction; two-fifths of the units responded less than one-fifth as well. Complex cells showed a somewhat greater tendency to directional bias than simple cells. LS neurons tended to have stronger directional asymmetries in their response to moving gratings: 83% of LS neurons showed a significant directional asymmetry. 5. Neurons in both areas responded independently to each component of the plaid. Thus cells giving single-lobed directional-tuning curves to gratings showed bilobed plaid tuning curves, with each lobe corresponding to movement in an effective direction by one of the two component gratings within the plaid. The two best directions for the plaids were those at which one or other single grating would have produced an optimal response when presented alone.(ABSTRACT TRUNCATED AT 400 WORDS)