The spatial distribution of the antagonistic surround of MT/V5 neurons.
The spatial distribution of the antagonistic surround of MT/V5 neurons.
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MT/V5 神经元拮抗周围的空间分布。
DOI：
10.1093/cercor/7.7.662
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发表时间：
1997
期刊：
影响因子：
3.7
通讯作者：
Guy Orban
中科院分区：
文献类型：
--
作者：
D. Xiao;S. Raiguel;Marcar;Guy Orban
中颞叶（MT）区/V5中的大多数（217/325，66%）神经元显示出强烈的拮抗性环绕，此处定义为总和曲线中至少减少50%。我们映射了145个这样的细胞中的拮抗性环绕，使用8个圆形分布的环绕刺激贴片（环绕不对称测试，SAT），并使用由25个正方形贴片组成的网格（环绕映射测试，SMT）映射了这145个细胞中的51个中的环绕。这两个测试表明，角环绕分布是不均匀的，在大多数这些神经元。在一半的神经元中，拮抗性环绕是不对称的，并且从兴奋性感受野（ERF）一侧的单个区域产生。在另一个四分之一的样本中，周围是双侧对称的，并且来自ERF相对两侧的一对区域。只有剩下的20%呈圆形对称环绕分布。这三组的层流分布不同。SMT显示，在径向上，环绕拮抗作用平均在ERF半径的1.5倍处达到最大值。的RF组件的兴奋性和抑制性区域的空间关系的详细比较表明，非均匀性的周围的影响似乎是一个固有的属性的周围。这样的属性可以作为从速度模式中提取表面取向和曲率的基础。
The majority (217/325, 66%) of the neurons in the middle temporal (MT) area/V5 show strong antagonistic surrounds, defined here by a decrease of at least 50% in the summation curve. We mapped the antagonistic surround in 145 such cells, using eight circularly distributed surround stimulus patches (Surround Asymmetry Test, SAT) and also mapped the surround in 51 of these 145 cells using a grid consisting of 25 square patches (Surround Mapping Test, SMT). Both tests showed that the angular surround distribution was non-uniform in the majority of these neurons. In half the neurons, the antagonistic surround was asymmetric, and arose from a single region on one side of the excitatory receptive field (ERF). In another quarter of the sample the surround was bilaterally symmetric, and arose from a pair of regions on opposite sides of the ERF. Only the remaining 20% showed a circularly symmetric surround distribution. These three groups differed in their laminar distribution. The SMT showed that, radially, the surround antagonism reached a maximum, on average, at 1.5 times the ERF radius. Detailed comparisons of the spatial relationships of excitatory and inhibitory regions of the RF components shows that non-homogeneity of the surround influence appears to be an intrinsic property of the surround. Such a property may underly the extraction of the surface orientation and curvature from speed patterns.
影响因子：
2.5
作者：
ALBRIGHT, TD
通讯作者：
ALBRIGHT, TD
影响因子：
2.5
作者：
KNIERIM, JJ;VANESSEN, DC
通讯作者：
VANESSEN, DC
影响因子：
2.5
作者：
MAUNSELL, JHR;VANESSEN, DC
通讯作者：
VANESSEN, DC