Wright M J
Perception. 1986;15(5):603-12. doi: 10.1068/p150603.
Adapting to a drifting grating (temporal frequency 4 Hz, contrast 0.4) in the periphery gave rise to a motion aftereffect (MAE) when the grating was stopped. A standard unadapted foveal grating was matched to the apparent velocity of the MAE, and the matching velocity was approximately constant regardless of the visual field position and spatial frequency of the adapting grating. On the other hand, when the MAE was measured by nulling with real motion of the test grating, nulling velocity was found to increase with eccentricity. The nulling velocity was constant when scaled to compensate for changes in the spatial 'grain' of the visual field. Thus apparent velocity of MAE is constant across the visual field, but requires a greater velocity of real motion to cancel it in the periphery. This confirms that the mechanism underlying MAE is spatially-scaled with eccentricity, but temporally homogeneous. A further indication of temporal homogeneity is that when MAE is tracked, by matching or by nulling, the time course of temporal decay of the aftereffect is similar for central and for peripheral stimuli.
在外周适应一个漂移光栅（时间频率4赫兹，对比度0.4）后，当光栅停止时会产生运动后效（MAE）。将一个标准的未适应的中央凹光栅与MAE的视在速度相匹配，并且无论适应光栅的视野位置和空间频率如何，匹配速度大致恒定。另一方面，当通过用测试光栅的真实运动进行抵消来测量MAE时，发现抵消速度随离心率增加。当进行缩放以补偿视野空间“粒度”的变化时，抵消速度是恒定的。因此，MAE的视在速度在整个视野中是恒定的，但在外周需要更大的真实运动速度来抵消它。这证实了MAE背后的机制在空间上随离心率缩放，但在时间上是均匀的。时间均匀性的另一个迹象是，当通过匹配或抵消来跟踪MAE时，中央和外周刺激的后效时间衰减的时间进程是相似的。
