Internal spatial organization of receptive fields of complex cells in the early visual cortex.
Internal spatial organization of receptive fields of complex cells in the early visual cortex.
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DOI：
10.1152/jn.00429.2007
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发表时间：
2007-09
影响因子：
2.5
通讯作者：
K. Sasaki;I. Ohzawa
中科院分区：
文献类型：
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作者：
K. Sasaki;I. Ohzawa
在早期的视觉皮层的复杂细胞的感受野经济地建模相结合的线性滤波器的正交对的输出。对于实际的复杂细胞，这样的最小模型可能是不够的，因为许多更简单的细胞被认为是组成一个复杂的细胞感受野。为了从生理学上研究极简模型，我们通过双刺激相互作用技术分析了单个复杂细胞的内部结构（亚基）和整体感受野之间的空间关系。复合细胞的感受野更圆，仅略大于其亚单位的大小。此外，复杂的细胞亚基占据的空间范围类似于简单的细胞感受野。因此，在这些方面，极简图式是对实际复杂细胞的合理近似。然而，也有违反最低模式的情况。简单细胞感受野的亚区比复杂细胞亚基少得多，一般来说，简单细胞感受野的水平伸长比垂直伸长多。这种偏向在复杂的细胞亚基和感受野中是不存在的。因此，简单细胞不能等同于单个复杂细胞亚基，并且简单细胞的空间汇集可以各向异性地发生以构成复杂细胞亚基。此外，当针对亮响应和暗响应分别检查用于复杂细胞亚基的线性滤波器时，它们之间存在显著的不平衡和位置位移。这表明，实际复杂的细胞感受野是由一个更丰富的线性滤波器的组合比最低限度的模型提出的。
The receptive fields of complex cells in the early visual cortex are economically modeled by combining outputs of a quadrature pair of linear filters. For actual complex cells, such a minimal model may be insufficient because many more simple cells are thought to make up a complex cell receptive field. To examine the minimalist model physiologically, we analyzed spatial relationships between the internal structure (subunits) and the overall receptive fields of individual complex cells by a two-stimulus interaction technique. The receptive fields of complex cells are more circular and only slightly larger than their subunits in size. In addition, complex cell subunits occupy spatial extents similar to those of simple cell receptive fields. Therefore in these respects, the minimalist schema is a fair approximation to actual complex cells. However, there are violations against the minimal model. Simple cell receptive fields have significantly fewer subregions than complex cell subunits and, in general, simple cell receptive fields are elongated more horizontally than vertically. This bias is absent in complex cell subunits and receptive fields. Thus simple cells cannot be equated to individual complex cell subunits and spatial pooling of simple cells may occur anisotropically to constitute a complex cell subunit. Moreover, when linear filters for complex cell subunits are examined separately for bright and dark responses, there are significant imbalances and position displacements between them. This suggests that actual complex cell receptive fields are constructed by a richer combination of linear filters than proposed by the minimalist model.