Illusory spatial offset of a flash relative to a moving stimulus is caused by differential latencies for moving and flashed stimuli
Illusory spatial offset of a flash relative to a moving stimulus is caused by differential latencies for moving and flashed stimuli
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DOI：
10.1016/s0042-6989(99)00166-2
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发表时间：
2000-01-01
期刊：
影响因子：
1.8
通讯作者：
Cavanagh, P
中科院分区：
文献类型：
--
作者：
Whitney, D;Murakami, I;Cavanagh, P
与连续移动的条相邻呈现的闪光被感知为滞后于条。对这种现象的一种解释是，闪光和光柱的持久性存在差异。另一种解释是，视觉系统通过在空间上沿着沿着其预期轨迹向前外推条的感知位置来补偿处理视觉运动信息（例如移动条）的神经延迟。两个实验表明，这两种模型都是不成立的。第一个实验在闪光出现后的一个视频帧中隐藏了闪光。闪光仍然被感知为滞后于条，这表明闪光和条的持续性的差异不会导致明显的偏移。第二个实验采用了不可预测的变化，在速度的酒吧，包括突然逆转，消失，加速和减速。如果外推模型成立，那么在速度突然变化之前，将继续根据其初始速度对棒进行外推。结果与这一预测不一致，这表明处理移动物体的神经延迟很少或根本没有空间补偿。结果支持一个新的模型的时间促进移动物体，其中明显的闪光灯滞后是由于一个延迟优势移动超过闪光刺激。(C)2000爱思唯尔科技有限公司版权所有。
A flash that is presented adjacent to a continuously moving bar is perceived to lag behind the bar. One explanation for this phenomenon is that there is a difference in the persistence of the flash and the bar. Another explanation is that the visual system compensates for the neural delays of processing visual motion information, such as the moving bar, by spatially extrapolating the bar's perceived location forward in space along its expected trajectory. Two experiments demonstrate that neither of these models is tenable. The first experiment masked the flash one video frame after its presentation. The flash was still perceived to lag behind the bar, suggesting that a difference in the persistence of the flash and bar, does not cause the apparent offset. The second experiment employed unpredictable changes in the velocity of the bar including an abrupt reversal, disappearance, acceleration, and deceleration. If the extrapolation model held, the bar would continue to be extrapolated in accordance with its initial velocity until the moment of an abrupt velocity change. The results were inconsistent with this prediction, suggesting that there is little or no spatial compensation for the neural delays of processing moving objects. The results support a new model of temporal facilitation for moving objects whereby the apparent flash lag is due to a latency advantage for moving over flashed stimuli. (C) 2000 Elsevier Science Ltd. All rights reserved.