Visual motion aftereffects arise from a cascade of two isomorphic adaptation mechanisms Export

@article{stocker_09_visual, abstract = {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 \^{a}€? signature\^{a}€? 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.}, author = {Stocker, Alan A. and Simoncelli, Eero P.}, citeulike-article-id = {5835510}, citeulike-linkout-0 = {http://journalofvision.org/9/9/9/}, eprint = {http://journalofvision.org/9/9/9/Stocker-2009-jov-9-9-9.pdf}, journal = {J. Vis.}, keywords = {adaptation, aperture, bias, coding, directional, discrimination, isomorphic, mechanism, motion, nondirectional, problem, signature, velocity, visual}, month = {August}, number = {9}, pages = {1--14}, posted-at = {2009-09-24 11:59:32}, priority = {2}, title = {{Visual motion aftereffects arise from a cascade of two isomorphic adaptation mechanisms}}, url = {http://journalofvision.org/9/9/9/}, volume = {9}, year = {2009} }

TY - JOUR ID - stocker_09_visual L3 - citeulike-article-id:5835510 N2 - 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. IS - 9 JF - J. Vis. EP - 14 TI - {Visual motion aftereffects arise from a cascade of two isomorphic adaptation mechanisms} VL - 9 SP - 1 KW - adaptation KW - aperture KW - bias KW - coding KW - directional KW - discrimination KW - isomorphic KW - mechanism KW - motion KW - nondirectional KW - problem KW - signature KW - velocity KW - visual AU - Stocker, Alan AU - Simoncelli, Eero PY - 2009/August// UR - http://journalofvision.org/9/9/9/ ER -