The flash-lag effect and the flash-drag effect in the same display
The flash-lag effect and the flash-drag effect in the same display
复制标题
同屏显示闪滞效果和闪拖效果
作者：
Murai;Y. & Murakami;I.
视觉运动会扭曲刺激的感知位置。在闪光拖曳效应(FDE)中，闪光的感知位置似乎向附近运动的方向移动。在闪光滞后效应(FLE)中，与运动刺激相邻的闪光似乎滞后。包括差异潜伏期假说在内的几个模型解释了FLE，即运动刺激比闪光具有更短的处理延迟。甚至当闪光早于运动刺激时，就会发生FDE，并讨论了这一时间特性是否可以用差分潜伏期模型来解释。在本研究中，我们使用随机跳跃技术(Murakami，2001b)同时量化了FDE和FLE，并比较了它们的时间特性。虽然随机跳跃刺激和闪光刺激之间的位置偏移决定了闪光效应，但在不同的刺激异步化时，闪光旁边出现了一个漂移的栅格来诱导FDE。在闪光诱发FDE后200ms出现栅格，其时间调谐由一个简单的卷积模型解释，该模型结合了从FLE数据估计的差分潜伏期的随机波动和运动信号的瞬时-持续的时间分布。因此，参考周围刺激计算刺激位置的共同时间机制管理FDE和FLE两者。
Visual motion distorts the perceived position of a stimulus. In the flash-drag effect (FDE), the perceived position of a flash appears to be shifted in the direction of nearby motion. In the flash-lag effect (FLE), a flash adjacent to a moving stimulus appears to lag behind. The FLE has been explained by several models, including the differential latency hypothesis, that a moving stimulus has a shorter processing latency than a flash does. The FDE even occurs when the flash is presented earlier than the moving stimulus, and it has been discussed whether this temporal property can be explained by the differential latency model. In the present study, we simultaneously quantified the FDE and FLE using the random jump technique (Murakami, 2001b) and compared their temporal properties. While the positional offset between a randomly jumping stimulus and a flashed stimulus determined the FLE, a drifting grating appeared next to the flash at various stimulus-onset asynchronies to induce the FDE. The grating presented up to 200 ms after the flash onset induced the FDE, whose temporal tuning was explained by a simple convolution model incorporating stochastic fluctuations of differential latency estimated from the FLE data and a transient-sustained temporal profile of motion signals. Thus, a common temporal mechanism to compute the stimulus position in reference to surrounding stimuli governs both the FDE and the FLE.