Illusory perceptions of space and time preserve cross-saccadic perceptual continuity
Illusory perceptions of space and time preserve cross-saccadic perceptual continuity
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DOI：
10.1038/35104551
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发表时间：
2001-11-15
期刊：
影响因子：
64.8
通讯作者：
Rothwell, JC
中科院分区：
文献类型：
--
作者：
Yarrow, K;Haggard, P;Rothwell, JC
当一个静默滴答的时钟被自发地跳动眼球时，观察者有时会认为秒针移动到下一个位置的时间比正常情况下长(1)。在很短的一段时间内，时钟似乎已经停止(时间停滞)。在这里，我们表明，错觉的产生是因为大脑将眼跳目标的感知时间向后延伸到恰好在眼跳开始之前。每次我们移动眼睛时都会发生这种情况，但只有当外部时间基准提醒我们注意这一现象时，才能感觉到这一点。这种错觉似乎并不依赖于伴随扫视而来的空间注意力的转移。然而，如果目标在扫视过程中不可预测地移动，打破了对目标空间连续性的感知，那么错觉就会消失。我们认为，目标知觉的时间延伸是在眼跳抑制过程中“填补”知觉“缺口”的机制之一。这种效应与识别目标空间稳定性的感知机制密切相关。
When voluntary saccadic eye movements are made to a silently ticking clock, observers sometimes think that the second hand takes longer than normal to move to its next position(1). For a short period, the clock appears to have stopped (chronostasis). Here we show that the illusion occurs because the brain extends the percept of the saccadic target backwards in time to just before the onset of the saccade. This occurs every time we move the eyes but it is only perceived when an external time reference alerts us to the phenomenon. The illusion does not seem to depend on the shift of spatial attention that accompanies the saccade. However, if the target is moved unpredictably during the saccade, breaking perception of the target's spatial continuity, then the illusion disappears. We suggest that temporal extension of the target's percept is one of the mechanisms that 'fill in' the perceptual 'gap' during saccadic suppression. The effect is critically linked to perceptual mechanisms that identify a target's spatial stability.