Falkenberg Helle K, Bex Peter J
Institute of Ophthalmology, University College London, London, UK.
J Exp Psychol Hum Percept Perform. 2007 Apr;33(2):257-70. doi: 10.1037/0096-1523.33.2.257.
The authors examined center-surround effects for motion perception in human observers. The magnitude of the motion aftereffect (MAE) elicited by a drifting grating was measured with a nulling task and with a threshold elevation procedure. A surround grating of the same spatial frequency, temporal frequency, and orientation significantly reduced the magnitude of the MAE elicited by adaptation to the center grating. This effect was bandpass tuned for spatial frequency, orientation, and temporal frequency. Plaid surrounds but not contrast-modulated surrounds that moved in the same direction also reduced the MAE. These results provide psychophysical evidence for center-surround interactions analogous to those previously observed in electrophysiological studies of motion processing in primates. Collectively, these results suggest that motion processing, similar to texture processing, is organized for the purpose of highlighting regions of directional discontinuity in retinal images.
作者研究了人类观察者运动感知中的中心-外周效应。通过归零任务和阈值提升程序测量了由漂移光栅诱发的运动后效（MAE）的大小。具有相同空间频率、时间频率和方向的外周光栅显著降低了适应中心光栅所诱发的MAE的大小。这种效应在空间频率、方向和时间频率上是带通调谐的。沿相同方向移动的格子外周而非对比度调制外周也降低了MAE。这些结果为类似于先前在灵长类动物运动处理的电生理研究中观察到的中心-外周相互作用提供了心理物理学证据。总体而言，这些结果表明，与纹理处理类似，运动处理是为了突出视网膜图像中方向不连续的区域而组织的。
