Selective and invariant sensitivity to crosses and corners in cat striate neurons
Selective and invariant sensitivity to crosses and corners in cat striate neurons
复制标题
猫纹状神经元对十字和角的选择性和不变敏感性
DOI：
10.1016/s0306-4522(97)00393-x
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发表时间：
1998
期刊：
影响因子：
3.3
通讯作者：
A. S. Tikhomirov
中科院分区：
文献类型：
--
作者：
I. Shevelev;N. A. Lazareva;G. A. Sharaev;R. V. Novikova;A. S. Tikhomirov
与首选方向的单个光条相比，在猫纹状皮层（区域 17）中研究的许多神经元（56/174，或 32.2%）在接受野中闪烁的特定或非特定形状和方向的十字形或角形刺激下，其反应显着增加（平均增加 3.3 倍）。大多数这些神经元（71.4%）被发现对这些图形的形状（图形线条之间的角度）和方向具有高度选择性。在研究的神经元选择中，我们还发现了十字和角调整对这些图形的方向和/或形状的所有可能类型的不变性。我们发现神经元对图形的形式具有选择性并且对其方向具有不变性，相反，单元对形状具有不变性但对方向具有选择性。发现一些细胞对十字形或角形的形状和方向不变，但对感受野中任何此类图形的出现高度敏感。可以考虑关于对十字和角度的选择性敏感性机制的两个主要假设。它们如下：具有不同偏好方向的两个单元的兴奋性聚合，以及皮质内抑制性相互作用。对单条进行双方向调整的单元相对较少（约 20%），因此第一个建议最不可能。这种情况特别重要，因为它提供了反对从一组低阶细胞中形成高阶皮质单元的层次结构的证据，这一点仍在讨论中。[8]对交叉或拐角具有高敏感性的单元似乎非常适合它们的选择，而不仅仅是充当经典的方向检测器。
Many neurons (56/174, or 32.2%) studied in the cat striate cortex (area 17) increased significantly (by 3.3 times on average) their responses under stimulation by cruciform or corner figures of specific or non-specific shape and orientation flashing in receptive field as compared with single light bar of preferred orientation. Most of these neurons (71.4%) were found to be highly selective to both the shape (the angle between the figure's lines) and orientation of these figures. In the neuronal selection studied we have also found all possible types of invariance of the cross and corner tuning to orientation and/or shape of these figures. We found neurons with selectivity to the form of the figures and invariance to their orientation and, on the contrary, units invariant to shape but selective to orientation. Some cells were found invariant to both the form and orientation of the cruciform or corner figure but highly sensitive to appearance of any such figure in the receptive field. Two main hypotheses about the mechanisms of selective sensitivity to crosses and angles can be considered. They are as follows: an excitatory convergence of two units with different preferred orientations, and intracortical inhibitory interactions. The cells with double orientation tuning for a single bar are found relatively rarely (about 20%), thus making the first suggestion the most unlikely. This circumstance is of special importance since it provides evidence against the hierarchic formation of the higher-order cortical units from a set of lower-order cells that is still under discussion.[8]The units with high sensitivity to cross or corner seem to be ideally suitable for their selection, rather than to serve as classical orientation detectors only.
影响因子：
2.5
作者：
GIZZI, MS;KATZ, E;MOVSHON, JA
通讯作者：
MOVSHON, JA
DOI：
10.1073/pnas.88.16.7071
发表时间：
1991-08
影响因子：
11.1
作者：
R. Born;R. Tootell
通讯作者：
R. Born;R. Tootell