Complex cells increase their phase sensitivity at low contrasts and following adaptation
Complex cells increase their phase sensitivity at low contrasts and following adaptation
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DOI：
10.1152/jn.00433.2007
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发表时间：
2007-09-01
影响因子：
2.5
通讯作者：
Ibbotson, M. R.
中科院分区：
文献类型：
--
作者：
Crowder, N. A.;Van Kleef, J.;Ibbotson, M. R.
神经科学中最著名的二分法之一是将哺乳动物初级视觉皮层的神经元分为简单细胞和复杂细胞。简单细胞具有具有单独的ON和OFF子区域的感受野，并且对移动光栅给出相敏响应，而复杂细胞具有均匀的感受野并且相位不变。单元格的相位灵敏度计算为第一傅里叶系数（F-1）与在100%对比度下移动正弦光栅响应的平均时间平均值（F-0）之比。然后在低对比度和适应后（特别是在第4层）将细胞分类为简单（F-1/F-0 >1）或复杂（F-1/F-0 1）。这一结果与“尖峰阈值假说”一致，认为细胞分裂为两种类型是由尖峰阈值与膜电位响应的非线性相互作用引起的。
One of the best-known dichotomies in neuroscience is the division of neurons in the mammalian primary visual cortex into simple and complex cells. Simple cells have receptive fields with separate ON and OFF subregions and give phase-sensitive responses to moving gratings, whereas complex cells have uniform receptive fields and are phase invariant. The phase sensitivity of a cell is calculated as the ratio of the first Fourier coefficient (F-1) to the mean time-average (F-0) of the response to moving sinusoidal gratings at 100% contrast. Cells are then classified as simple (F-1/F-0 >1) or complex (F-1/F-0 1 at low contrasts and after adaptation (particularly in layer 4). The results are consistent with the spike-threshold hypothesis, which suggests that the division of cells into two types arises from the nonlinear interaction of spike threshold with membrane potential responses.