Long-range suppressive interactions between S-cone and luminance channels.
Long-range suppressive interactions between S-cone and luminance channels.
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DOI：
10.1016/j.visres.2009.03.023
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发表时间：
2009-06
期刊：
影响因子：
1.8
通讯作者：
Wade, Alex R.
中科院分区：
文献类型：
--
作者：
Wade, Alex R.
周围抑制（SS）是指在一个视觉位置中由相邻位置中出现的刺激产生的有效刺激对比度的降低。这种类型的抑制针对方向和空间频率进行调整，被认为是一种皮质过程。在本文中，我们使用心理物理学测量来确定 S 锥体驱动的信号是否受到环绕声抑制的影响，如果是，则确定 S 锥体和消色差信号是否在空间远程位置相互作用。我们的结果揭示了环绕声抑制的三个重要方面。首先，我们证明 S 锥体探针受到同时 S 锥体对比周围环境的抑制，并且这种抑制具有皮质机制的特征。其次，我们表明，当同时呈现探头和周围环境时，S 锥体和亮度刺激之间不存在抑制性相互作用。最后，我们证明这种明显的独立性是信号时序的产物：当刺激的 S 锥分量先于亮度分量大约 40 毫秒时，我们发现两条路径之间存在显着的相互作用。这种相互作用的幅度主要取决于两个组分的相对起始时间。这些结果表明，环绕抑制的某些组成部分取决于 S 通路和亮度通路在纹状皮层中组合后发生的神经计算。此外，环绕声抑制的幅度对时间顺序的强烈依赖性表明大部分效果是由瞬态信号驱动的。
Surround suppression (SS) refers to a reduction in the effective stimulus contrast in one visual location produced by a stimulus presented in an adjacent location. This type of suppression is tuned for orientation and spatial frequency and is thought to be a cortical process. In this paper we used psychophysical measurements to determine whether S-cone-driven signals are affected by surround suppression and, if so, whether S-cone and achromatic signals interact at spatially-remote locations. Our results revealed three important aspects of surround suppression. Firstly, we show that S-cone probes are suppressed by simultaneous S-cone contrast surrounds and that this suppression has the characteristics of a cortical mechanism. Secondly, we show that when probes and surrounds are presented simultaneously, there are no suppressive interactions between S-cone and luminance stimuli. Finally, we demonstrate that this apparent independence is an artifact of signal timing: When the S-cone components of the stimuli precede the luminance components by approximately 40ms, we find a significant interaction between the two pathways. The amplitude of this interaction depends critically upon the relative onset times of the two components. These results indicate that some component of surround suppression depends on neural computations that occur after the S- and Luminance pathways are combined in striate cortex. In addition, the strong dependence of the magnitude of surround suppression on temporal ordering suggests that much of the effect is driven by transient signals.
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影响因子：
1.8
作者：
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通讯作者：
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影响因子：
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作者：
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DOI：
10.1364/josaa.4.001428
发表时间：
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