The continuous wagon wheel illusion is associated with changes in electroencephalogram power at ∼13 Hz
The continuous wagon wheel illusion is associated with changes in electroencephalogram power at ∼13 Hz
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DOI：
10.1523/jneurosci.4654-05.2006
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发表时间：
2006-01-11
影响因子：
5.3
通讯作者：
Koch, C
中科院分区：
文献类型：
--
作者：
VanRullen, R;Reddy, L;Koch, C
连续运动的物体有时会自发地逆转其运动方向。这种双稳态现象（“连续的马车轮错觉”）背后的机制备受争议，但有一种解释表明，运动信息是在10到15赫兹之间的离散事件中被感知的。在这里，我们要求观察者报告在记录32通道脑电图（EEG）的同时感知到的连续旋转车轮的方向。然后，我们将感知到的真实运动与虚幻（反向）运动分开，并比较在这两种感知不同但物理上相同的条件下的脑电图功率谱。唯一可靠的区别是在中央顶叶电极上观察到类似13赫兹的频率，与车轮的时间频率无关。因此，它很可能反映了内部过程，而不是纯粹的刺激驱动的活动。脑电功率（13 Hz）在虚幻运动开始前下降，在回归真实运动前上升。利用这种关系，在一次又一次的试验基础上，可以预测即将到来的感知转变的方向。这些数据与运动感知发生在持续时间< 100毫秒的快照中的想法是一致的。
Continuously moving objects sometimes appear to spontaneously reverse their motion direction. The mechanisms underlying this bistable phenomenon ( the "continuous wagon wheel illusion") are heavily debated, but one interpretation suggests that motion information is perceived in discrete episodes at a rate between 10 and 15 Hz. Here, we asked observers to report the perceived direction of a continuously rotating wheel while 32-channel electroencephalogram ( EEG) was recorded. We then separated periods of perceived true from illusory ( reversed) motion and compared the EEG power spectrum under these two perceptually distinct yet physically identical conditions. The only reliable difference was observed similar to 13 Hz over centroparietal electrodes, independent of the temporal frequency of the wheel. Thus, it is likely to reflect internal processes rather than purely stimulus-driven activity. EEG power ( 13 Hz) decreased before the onset of illusory motion and increased before transitions back to real motion. Using this relationship, it was possible to predict above chance, on a trial-by-trial basis, the direction of the upcoming perceptual transition. These data are compatible with the idea that motion perception occurs in snapshots < 100 ms in duration.