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首页> 外文期刊>Journal of Neurophysiology >Neural mechanisms for processing binocular information II. Complex cells.
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Neural mechanisms for processing binocular information II. Complex cells.

机译：处理双眼信息的神经机制II。复杂的细胞。

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Complex cells in the striate cortex exhibit extensive spatiotemporal nonlinearities, presumably due to a convergence of various subunits. Because these subunits essentially determine many aspects of a complex cell receptive field (RF), such as tuning for orientation, spatial frequency, and binocular disparity, examination of the RF properties of subunits is important for understanding functional roles of complex cells. Although monocular aspects of these subunits have been studied, little is known about their binocular properties. Using a sophisticated RF mapping technique that employs binary m-sequences, we have examined binocular interactions exhibited by complex cells in the cat's striate cortex and the binocular RF properties of their underlying functional subunits. We find that binocular interaction RFs of complex cells exhibit subregions that are elongated along the frontoparallel axis at different binocular disparities. Therefore responses of complex cells are largely independent of monocular stimulus position or phase as long as the binocular disparity of the stimulus is kept constant. The binocular interaction RF is well described by a sum of binocular interaction RFs of underlying functional subunits, which exhibit simple cell-like RFs and a preference for different monocular phases but the same binocular disparity. For more than half of the complex cells examined, subunits of each cell are consistent with the characteristics specified by an energy model, with respect to the number of subunits as well as relationships between the subunit properties. Subunits exhibit RF binocular disparities that are largely consistent with a phase mechanism for encoding binocular disparity. These results indicate that binocular interactions of complex cells are derived from simple cell-like subunits, which exhibit multiplicative binocular interactions. Therefore binocular interactions of complex cells are also multiplicative. This suggests that complex cells compute something analogous to an interocular cross-correlation of images for a local region of visual space. The result of this computation can be used for solving the stereo correspondence problem.
机译：条纹皮层中的复杂细胞表现出广泛的时空非线性，可能是由于各种亚基的收敛所致。因为这些亚基实质上决定了复杂细胞接受场（RF）的许多方面，例如方向，空间频率和双眼视差的调整，所以检查亚基RF特性对于理解复杂细胞的功能作用非常重要。尽管已经研究了这些亚基的单眼特性，但对其双眼特性知之甚少。使用采用二进制m序列的先进的RF映射技术，我们已经检查了猫的纹状皮质中复杂细胞所表现出的双目相互作用以及其潜在功能亚基的双目RF特性。我们发现，复杂细胞的双眼相互作用RF表现出在不同的双眼视差处沿着额平行轴拉长的子区域。因此，只要刺激的双眼视差保持恒定，复杂细胞的反应就很大程度上与单眼刺激位置或相位无关。基本功能亚基的双目相互作用RF的总和很好地描述了双眼相互作用RF，这些功能亚基表现出简单的细胞样RF，并且偏爱不同的单眼相位但具有相同的双眼视差。对于一半以上的复杂细胞，每个细胞的亚基与能量模型指定的特征一致，关于亚基的数量以及亚基性质之间的关系。亚基表现出RF双眼视差，其与编码双眼视差的相位机制基本一致。这些结果表明，复杂细胞的双眼相互作用源自简单的细胞样亚基，其表现出倍增的双眼相互作用。因此，复杂细胞的双眼相互作用也是倍增的。这表明复杂的单元格计算类似于视觉空间局部区域的图像的眼间互相关。该计算的结果可以用于解决立体对应问题。

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