Shorter latencies for motion trajectories than for flashes in population responses of cat primary visual cortex
Shorter latencies for motion trajectories than for flashes in population responses of cat primary visual cortex
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DOI：
10.1113/jphysiol.2003.058941
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发表时间：
2004-05-01
影响因子：
5.5
通讯作者：
Dinse, HR
中科院分区：
文献类型：
--
作者：
Jancke, D;Erlhagen, W;Dinse, HR
人类的心理物理学证据表明，定位是不同的固定闪光和连贯移动的对象。为了解决初级视觉皮层如何代表物体位置，我们使用了一种群体方法，该方法汇集了猫17区许多神经元的尖峰活动。为了响应闪烁的静止方块（0.4度），我们获得了视野坐标中的局部活动分布，我们将其称为“群体感受野”（PRF）的分布图。我们在这里展示了如何运动轨迹可以来自整个PRF的活动，以及如何表示移动和闪烁的刺激不同的位置。我们发现，运动是由人口活动的高峰，随后的刺激与速度依赖性滞后。然而，时间到峰值的lavenance是短的类似16毫秒相比，人口的反应，固定闪光。此外，运动表征表现出方向性偏差，因为与相反方向相比，外周到中心运动的延迟减少更多。我们认为，一个移动的刺激提供了“预激活”，允许更快速的处理比一个单一的闪光事件。
Psychophysical evidence in humans indicates that localization is different for stationary flashed and coherently moving objects. To address how the primary visual cortex represents object position we used a population approach that pools spiking activity of many neurones in cat area 17. In response to flashed stationary squares (0.4 deg) we obtained localized activity distributions in visual field coordinates, which we referred to as profiles across a 'population receptive field' (PRF). We here show how motion trajectories can be derived from activity across the PRF and how the representation of moving and flashed stimuli differs in position. We found that motion was represented by peaks of population activity that followed the stimulus with a speed-dependent lag. However, time-to-peak latencies were shorter by similar to16 ms compared to the population responses to stationary flashes. In addition, motion representation showed a directional bias, as latencies were more reduced for peripheral-to-central motion compared to the opposite direction. We suggest that a moving stimulus provides 'preactivation' that allows more rapid processing than for a single flash event.