Central V4 receptive fields are scaled by the V1 cortical magnification and correspond to a constant-sized sampling of the V1 surface.
Central V4 receptive fields are scaled by the V1 cortical magnification and correspond to a constant-sized sampling of the V1 surface.
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DOI：
10.1523/jneurosci.4496-08.2009
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发表时间：
2009-05-06
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影响因子：
--
通讯作者：
Motter BC
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文献类型：
--
作者：
Motter BC
在整个皮层视觉区的层次结构中，视野到皮层区域的地形表示的映射发生变化。这些变化被认为反映了具有不同空间处理重点的模块的建立。然而，这些模块内的神经元的感受野（RF），可能不受相同的空间地形图参数。在这里，它表明，RF的V4区神经元（中心1-12度的偏心）是基于一个圆形对称采样的初级视觉皮层视网膜定位图。在V4神经元中没有明显的偏心率依赖性放大超过在V1中观察到的。V4 RF的大小和形状可以通过来自跨V1表面布置的视网膜定位图的视觉输入的简单、恒定大小的2D高斯样本来解释。关于神经元感受野内相互作用的空间尺度的推断不能基于来自地形图的视觉区域的明显皮层放大。
The mapping of the topographic representation of the visual field onto cortical areas changes throughout the hierarchy of cortical visual areas. The changes are believed to reflect the establishment of modules with different spatial processing emphasis. The receptive fields (RFs) of neurons within these modules, however, may not be governed by the same spatial topographic map parameters. Here it is shown that the RFs of area V4 neurons (centered 1–12 degs in eccentricity) are based on a circularly symmetric sampling of the primary visual cortical retinotopic map. No eccentricity dependent magnification beyond that observed in V1 is apparent in the V4 neurons. The size and shape of V4 RFs can be explained by a simple, constant sized, 2D Gaussian sample of visual input from the retinotopic map laid out across the surface of V1. Inferences about the spatial scale of interactions within the receptive fields of neurons cannot be based on a visual area’s apparent cortical magnification derived from topographic mapping.