Center-surround inhibition and facilitation as a function of size and contrast at multiple levels of visual motion processing
Center-surround inhibition and facilitation as a function of size and contrast at multiple levels of visual motion processing
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DOI：
10.1167/5.6.8
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发表时间：
2005-01-01
影响因子：
1.8
通讯作者：
Verstraten, FAJ
中科院分区：
文献类型：
--
作者：
Paffen, CLE;van der Smagt, MJ;Verstraten, FAJ
视觉环境在视觉加工中起着至关重要的作用。在视觉运动处理领域，神经元的经典感受野对刺激的反应可以通过向其周围环境提供刺激来调节。这些中心-周围相互作用的性质通常是抑制性的;当向中心和周围呈现相同的运动方向时，神经反应会降低。在这里，我们使用双目竞争作为一种工具来研究中心周围的相互作用。我们发现，环绕抑制的幅度作为亮度对比度和环绕宽度的函数而变化。增加环绕运动的大小增加了高对比度下的环绕抑制。此外，大的，高对比度的周围促进了中心的相反方向的运动。对于在低对比度下呈现的刺激，环绕抑制在较小的环绕宽度处达到峰值。此外，我们提供的证据表明，环绕抑制发生在多个层次的视觉处理：运动处理中的环绕抑制很可能起源于单眼和双眼处理阶段。
Visual context often plays a crucial role in visual processing. In the domain of visual motion processing, the response to a stimulus presented to a neuron's classical receptive field can be modulated by presenting stimuli to its surround. The nature of these center-surround interactions is often inhibitory; the neural response decreases when the same direction of motion is presented to center and surround. Here we use binocular rivalry as a tool to study center-surround interactions. We show that magnitude of surround suppression varies as a function of luminance contrast and surround width. Increasing the size of surround motion increased surround suppression at high contrast. Furthermore, large, high-contrast surrounds facilitated opposite-direction motion in the center. For stimuli presented at low contrast, surround suppression peaked at a smaller surround width. In addition, we provide evidence that surround inhibition occurs at multiple levels of visual processing: Surround inhibition in motion processing is likely to originate from both monocular and binocular processing stages.