Representation of spatial frequency and orientation in the visual cortex
Representation of spatial frequency and orientation in the visual cortex
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DOI：
10.1073/pnas.95.14.8334
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发表时间：
1998-07-07
影响因子：
11.1
通讯作者：
Kaplan, E
中科院分区：
文献类型：
--
作者：
Everson, RM;Prashanth, AK;Kaplan, E
初级视觉皮层对视觉场景中各种空间频率和方向的反应的知识应该有助于我们理解大脑识别模式的原理。由于难以记录和解释足够的数据，目前关于空间频率响应的皮层布局的信息仍然是不完整的。在这里，我们报告的结果，从猫的初级视觉皮层的研究中，我们采用了一种新的图像分析方法，可以改善分离的信号与噪声，我们用来检查的初级视觉皮层的神经光学响应漂移正弦光栅在一定范围内的方向和空间频率。我们发现：（i）对所有方向和空间频率的光学响应都可以很好地近似于两对基本图像的加权和，一对用于方向，另一对用于空间频率;（ii）每对中两个图像的权重近似正交（1/4周期间隔）;和（iii）我们的空间频率数据揭示了一个皮层地图，连续分配不同的最佳空间频率响应不同的皮层位置在整个空间频率范围。
Knowledge of the response of the primary visual cortex to the various spatial frequencies and orientations in the visual scene should help us understand the principles by which the brain recognizes patterns. Current information about the cortical layout of spatial frequency response is still incomplete because of difficulties in recording and interpreting adequate data. Here, we report results from a study of the cat primary visual cortex in which we employed a new image-analysis method that allows improved separation of signal from noise and that we used to examine the neurooptical response of the primary visual cortex to drifting sine gratings over a range of orientations and spatial frequencies. We found that (i) the optical responses to all orientations and spatial frequencies were well approximated by weighted sums of only two pairs of basis pictures, one pair for orientation and a different pair for spatial frequency; (ii) the weightings of the two pictures in each pair were approximately in quadrature (1/4 cycle apart); and (iii) our spatial frequency data revealed a cortical map that continuously assigns different optimal spatial frequency responses to different cortical locations over the entire spatial frequency range.