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首页> 外文期刊>Cerebral cortex >The spatial pattern of response magnitude and selectivity for orientation and direction in cat visual cortex.
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The spatial pattern of response magnitude and selectivity for orientation and direction in cat visual cortex.

机译：猫视觉皮层中方向和方向的响应幅度和选择性的空间模式。

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摘要

Optical imaging studies of orientation and direction preference in visual cortex have typically used vector averaging to obtain angle and magnitude maps. This method has shown half-rotation orientation singularities (pinwheels) located within regions of low orientation vector magnitude. Direction preference is generally orthogonal to orientation preference, but often deviates from this, particularly in regions of low direction vector magnitude. Linear regions of rapid change in direction preference terminate in or near orientation singularities. The vector-averaging method is problematic however because it does not clearly disambiguate spatial variation in orientation tuning width from variation in height. It may also wrongly estimate preferred direction in regions where preference is weak. In this paper we analyze optical maps of cat visual cortex by fitting model tuning functions to the responses. This new method reveals features not previously evident. Orientation tuning height and width vary independently across the map: tuning height is always low near singularities, however regions of broad and narrow orientation tuning width can be found in regions of low tuning height, often alternating in a spoke-like fashion around singularities. Orientation and direction preference angles are always closely orthogonal. Reversals in direction preference form lines that originate precisely in orientation singularities.
机译：视觉皮层中方向和方向偏好的光学成像研究通常使用矢量平均来获得角度和大小图。此方法显示了位于低定向矢量幅度区域内的半旋转定向奇异点（风车）。方向偏好通常与方向偏好正交，但通常会偏离方向偏好，尤其是在方向向量幅值较低的区域中。方向偏好快速变化的线性区域终止于或接近方向奇异点。然而，矢量平均方法是有问题的，因为它不能从高度变化中清楚地消除定向调谐宽度的空间变化。在偏好较弱的地区，它也可能会错误地估计首选方向。在本文中，我们通过将模型调整函数拟合到响应中来分析猫视皮层的光学图。这种新方法揭示了以前不明显的功能。方向调整高度和宽度在整个地图上独立变化：调整高度在奇点附近始终较低，但是，在较低调整高度的区域中可以找到宽而窄的方向调整宽度区域，通常在奇点周围以轮辐状交替出现。方向角和方向偏好角始终紧密正交。方向首选项的反转形成了精确起源于方向奇点的线。

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