Contextual effects in speed perception may occur at an early stage of processing.
Contextual effects in speed perception may occur at an early stage of processing.
复制标题
速度感知中的情境效应可能发生在处理的早期阶段。
DOI：
10.1016/j.visres.2009.11.011
复制
发表时间：
2010
期刊：
影响因子：
1.8
通讯作者：
Baker DH
中科院分区：
文献类型：
--
作者：
Baker DH
附近的运动如何影响目标区域的感知速度？当中心漂移的Gabor贴片被平移噪声包围时，其速度可以在四倍范围内被误解。通常情况下，当环绕在同一方向移动时，感知的中心速度会降低;对于相反方向的环绕，它会增加。测量这种错觉的各种环绕属性显示，运动上下文的影响是一个饱和的功能，环绕速度（实验I）和对比度（实验II）。我们的分析表明，效果是一致的减法过程中，而不是与速度平均面积。在实验III中，我们利用运动系统的已知属性来询问这些环绕效果的影响。使用二维格子刺激，我们发现，周围引起的变化，在感知速度的一个格子组件产生实质性的变化，感知格子方向。这表明，在计算图案运动方向之前，环绕物在处理的早期就施加了它们的影响。这些发现涉及到正在进行的调查，环绕抑制方向歧视，并与单细胞的结果一致的方向调整抑制和促进初级视觉皮层（V1）的相互作用。
How does nearby motion affect the perceived speed of a target region? When a central drifting Gabor patch is surrounded by translating noise, its speed can be misperceived over a fourfold range. Typically, when a surround moves in the same direction, perceived centre speed is reduced; for opposite-direction surrounds it increases. Measuring this illusion for a variety of surround properties reveals that the motion context effects are a saturating function of surround speed (Experiment I) and contrast (Experiment II). Our analyses indicate that the effects are consistent with a subtractive process, rather than with speed being averaged over area. In Experiment III we exploit known properties of the motion system to ask where these surround effects impact. Using 2D plaid stimuli, we find that surround-induced shifts in perceived speed of one plaid component produce substantial shifts in perceived plaid direction. This indicates that surrounds exert their influence early in processing, before pattern motion direction is computed. These findings relate to ongoing investigations of surround suppression for direction discrimination, and are consistent with single-cell findings of direction-tuned suppressive and facilitatory interactions in primary visual cortex (V1).