Neural Correlates of Subsecond Time Distortion in the Middle Temporal Area of Visual Cortex
Neural Correlates of Subsecond Time Distortion in the Middle Temporal Area of Visual Cortex
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DOI：
10.1162/jocn_a_00071
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发表时间：
2011-12-01
影响因子：
3.2
通讯作者：
Cook, Erik P.
中科院分区：
文献类型：
--
作者：
Sadeghi, Navid G.;Pariyadath, Vani;Cook, Erik P.
大脑如何在亚秒尺度上表示时间的流逝？虽然人们提出了不同的时间知觉概念模型，但其神经生理学基础尚不清楚。我们利用新奇刺激产生的视觉持续时间错觉，将猴子皮层活动的变化与人类持续时间感知的扭曲联系起来。我们发现，人类受试者感知到具有新方向的亚秒运动脉冲的持续时间比具有重复方向的运动脉冲的持续时间长。通过对观察相同运动刺激但执行不同行为任务的猴子的记录，我们发现视觉皮层中颞叶区神经反应的持续时间和幅度与运动方向的新颖性程度呈正相关。与之前将持续时间感知的扭曲归因于假定的内部时钟速度的变化的说法相反，我们的研究结果表明，视觉皮层中已知的神经活动的适应性特性有助于亚秒级的时间扭曲。
How does the brain represent the passage of time at the subsecond scale? Although different conceptual models for time perception have been proposed, its neurophysiological basis remains unknown. We took advantage of a visual duration illusion produced by stimulus novelty to link changes in cortical activity in monkeys with distortions of duration perception in humans. We found that human subjects perceived the duration of a subsecond motion pulse with a novel direction longer than a motion pulse with a repeated direction. Recording from monkeys viewing identical motion stimuli but performing a different behavioral task, we found that both the duration and amplitude of the neural response in the middle temporal area of visual cortex were positively correlated with the degree of novelty of the motion direction. In contrast to previous accounts that attribute distortions in duration perception to changes in the speed of a putative internal clock, our results suggest that the known adaptive properties of neural activity in visual cortex contributes to subsecond temporal distortions.