期刊
JOURNAL OF VISION
卷 9, 期 9, 页码 -出版社
ASSOC RESEARCH VISION OPHTHALMOLOGY INC
DOI: 10.1167/9.9.9
关键词
motion adaptation; signature; bias; discrimination; isomorphic mechanism; directional; nondirectional; velocity; aperture problem
资金
- Howard Hughes Medical Institute Funding Source: Medline
Prolonged exposure to a moving stimulus can substantially alter the perceived velocity ( both speed and direction) of subsequently presented stimuli. Here, we show that these changes can be parsimoniously explained with a model that combines the effects of two isomorphic adaptation mechanisms, one nondirectional and one directional. Each produces a pattern of velocity biases that serves as an observable signature of the corresponding mechanism. The net effect on perceived velocity is a superposition of these two signatures. By examining human velocity judgments in the context of different adaptor velocities, we are able to separate these two signatures. The model. fits the data well, successfully predicts subjects' behavior in an additional experiment using a nondirectional adaptor, and is in agreement with a variety of previous experimental results. As such, the model provides a unifying explanation for the diversity of motion aftereffects.
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