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首页> 外文期刊>Journal of Neurophysiology >Properties of pattern and component direction-selective cells in area MT of the macaque
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Properties of pattern and component direction-selective cells in area MT of the macaque

机译：猕猴区域MT中的模式和方向选择单元格的属性

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Neurons in area MT/V5 of the macaque visual cortex encode visual motion. Some cells are selective for the motion of oriented features (component direction-selective, CDS); others respond to the true direction of complex patterns (pattern-direction selective, PDS). There is a continuum of selectivity in MT, with CDS cells at one extreme and PDS cells at the other; we compute a pattern index that captures this variation. It is unknown how a neuron's pattern index is related to its other tuning characteristics. We therefore analyzed the responses of 792 MT cells recorded in the course of other experiments from opiate-anesthetized macaque monkeys, as a function of the direction, spatial frequency, drift rate, size, and contrast of sinusoidal gratings and of the direction and speed of random-dot textures. We also compared MT responses to those of 718 V1 cells. As expected, MT cells with higher pattern index tended to have stronger direction selectivity and broader direction tuning to gratings, and they responded better to plaids than to gratings. Strongly PDS cells also tended to have smaller receptive fields and stronger surround suppression. Interestingly, they also responded preferentially to higher drift rates and higher speeds of moving dots. The spatial frequency preferences of PDS cells depended strongly on their preferred temporal frequencies, whereas these preferences were independent in component-selective cells. Pattern direction selectivity is statistically associated with many response properties of MT cells but not strongly associated with any particular property. Pattern-selective signals are thus available in association with most other signals exported by MT.
机译：猕猴视觉皮层区域MT / V5中的神经元编码视觉运动。一些单元对于定向特征的运动是选择性的（组件方向选择性，CDS）;其他人则响应复杂模式的真实方向（模式方向选择，PDS）。 MT具有选择性的连续性，一个极端是CDS细胞，另一个极端是PDS细胞。我们计算出捕获这种变化的模式索引。未知神经元的模式指数如何与其其他调节特性相关。因此，我们分析了鸦片麻醉的猕猴在其他实验过程中记录的792 MT细胞的响应，这些响应是方向，空间频率，漂移率，大小和正弦光栅对比度以及函数的方向和速度的函数。随机点纹理。我们还比较了MT反应与718 V1细胞的反应。不出所料，具有较高图案索引的MT单元倾向于对光栅具有更强的方向选择性和更宽的方向调谐性，并且它们对格子的响应比对光栅的响应更好。强烈的PDS细胞也倾向于具有较小的感受野和较强的环绕抑制。有趣的是，他们还优先响应较高的漂移率和较高的移动点速度。 PDS细胞的空间频率偏好在很大程度上取决于它们的首选时间频率，而这些偏好在组件选择细胞中是独立的。模式方向选择性在统计上与MT细胞的许多响应特性相关，但与任何特定特性均不相关。因此，模式选择信号可与MT输出的大多数其他信号相关联。

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