Hess R F, Doshi S
Department of Ophthalmology, McGill University, Montreal, Quebec, Canada.
Perception. 1995;24(12):1407-26. doi: 10.1068/p241407.
After prolonged viewing of a three-element target in which the middle element is spatially offset, subsequent viewing of the same three elements in alignment results in the middle element appearing to be offset in the opposite direction. This adaptational aftereffect to a spatial offset was investigated with elements which were spatial-frequency narrowband and equidetectable to ascertain (a) the properties of the mechanisms involved and (b) the nature of the underlying computation. Evidence is presented in favour of an orientational-grouping, rather than a purely positional computation, underlying this aftereffect. A dual site of adaptation is proposed: one which receives input from the orientation extracted from the output of linear filters, and another which receives input from the orientation derived from grouping processes working on the contrast-energy representation. These may correspond to the mechanisms which are thought to underlie the processing of real and subjective contours.
在长时间观察中间元素存在空间偏移的三元目标后，随后观察排列对齐的相同三元元素时，中间元素似乎会向相反方向偏移。使用空间频率窄带且等可检测的元素对这种空间偏移的适应性后效进行了研究，以确定：（a）所涉及机制的特性；（b）潜在计算的性质。提出了支持这种后效的基于方向分组而非纯粹位置计算的证据。提出了一个双重适应位点：一个接收来自线性滤波器输出中提取的方向的输入，另一个接收来自对对比度能量表示进行分组处理得出的方向的输入。这些可能对应于被认为是真实和主观轮廓处理基础的机制。
