Electrophysiological evidence for independent speed channels in human motion processing
Electrophysiological evidence for independent speed channels in human motion processing
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DOI：
10.1167/4.6.6
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发表时间：
2004-01-01
影响因子：
1.8
通讯作者：
Hoffmann, MB
中科院分区：
文献类型：
--
作者：
Heinrich, SP;van der Smagt, MJ;Hoffmann, MB
“各种心理物理学研究表明，人类的运动感知是由至少两个速度调节通道介导的。为了研究这些通道在人类视觉皮层的神经生理学基础，我们记录了视觉诱发电位（VEPs）到运动开始。我们采用了一种适应范式，允许我们(a)分离和提取方向特异性皮层反应，(b)评估速度域的交叉适应。在11名受试者的三个枕部记录部位记录了低速或高速向左或向右运动引起的vep。对于每一种测试刺激，在适应五种不同条件之一后收集反应：静态适应模式（基线），适应与测试相同或相反方向的低速运动（3.5度/秒），或适应与测试相同或相反方向的高速运动（32度/秒）。我们报告了相当大的方向特异性适应相同的适应和测试速度(28-37%的基线反应；p
'A variety of psychophysical studies suggests that motion perception in humans is mediated by at least two speed-tuned channels. To study the neurophysiological underpinnings of these channels in the human visual cortex, we recorded visual evoked potentials (VEPs) to motion onset. We applied an adaptation paradigm that allowed us (a) to isolate and extract direction-specific cortical responses and (b) to assess cross-adaptation in the speed domain. VEPs resulting from the onset of left- or rightward motion at either low or high speeds were recorded from three occipital recording sites in 11 subjects. For each of these test stimuli, responses were collected after adaptation to one of five different conditions: a static adaptation pattern (baseline), adaptation to low-speed motion (3.5degrees/s) either in the same or in the opposite direction as the test, or adaptation to high-speed motion (32degrees/s) either in the same or in the opposite direction as the test. We report considerable direction-specific adaptation for same adaptation and test speeds (by 28-37% of baseline response; p