Perceived motion in orientational afterimages: direction and speed Export

@article{Francis2001Perceived, abstract = {Two sets of experiments demonstrate new properties of motion in orientational after-effects. In a previous report, we showed that when observers adapted to a static bar grating whose elements varied in size or intensity from one side to the other, offset of the grating resulted in a motion after-effect, with the perceived motion in the direction of the largest or most intense bar. In the first new experiment, we show that similar results can be produced by varying the duration of the bar elements, with the direction of the motion after-effect toward the bar with the longest duration. In the second new experiment we demonstrate that the perceived speed of the motion aftereffect is influenced by the spatial extent of the after-effect, with larger extents corresponding to faster speeds. The experimental findings are discussed in the context of a neural network theory of visual perception. In this theory, a moving oriented contour leaves a trail of activity among cortical cells tuned to orthogonal orientations. We hypothesize that the grating stimuli produce after-effects that mimic the pattern of oriented responses produced by a true moving contour, and the visual system interprets this pattern as a cue for motion. We also show how the model connects the properties of these motion after-effects to properties of visual persistence.}, author = {Francis, Gregory and Kim, Hyungjun}, citeulike-article-id = {2845117}, citeulike-linkout-0 = {http://dx.doi.org/10.1016/S0042-6989(00)00242-X}, citeulike-linkout-1 = {http://www.sciencedirect.com/science/article/B6T0W-423YMGY-4/1/a24a66e2378f90531b670b0403623472}, doi = {10.1016/S0042-6989(00)00242-X}, journal = {Vision Research}, keywords = {afterimage, bcs, dipole, motion, persistence, psychophysics}, month = {January}, number = {2}, pages = {161--172}, posted-at = {2008-05-29 17:18:49}, priority = {3}, title = {Perceived motion in orientational afterimages: direction and speed}, url = {http://dx.doi.org/10.1016/S0042-6989(00)00242-X}, volume = {41}, year = {2001} }

TY - JOUR ID - Francis2001Perceived L3 - citeulike-article-id:2845117 N2 - Two sets of experiments demonstrate new properties of motion in orientational after-effects. In a previous report, we showed that when observers adapted to a static bar grating whose elements varied in size or intensity from one side to the other, offset of the grating resulted in a motion after-effect, with the perceived motion in the direction of the largest or most intense bar. In the first new experiment, we show that similar results can be produced by varying the duration of the bar elements, with the direction of the motion after-effect toward the bar with the longest duration. In the second new experiment we demonstrate that the perceived speed of the motion aftereffect is influenced by the spatial extent of the after-effect, with larger extents corresponding to faster speeds. The experimental findings are discussed in the context of a neural network theory of visual perception. In this theory, a moving oriented contour leaves a trail of activity among cortical cells tuned to orthogonal orientations. We hypothesize that the grating stimuli produce after-effects that mimic the pattern of oriented responses produced by a true moving contour, and the visual system interprets this pattern as a cue for motion. We also show how the model connects the properties of these motion after-effects to properties of visual persistence. IS - 2 JF - Vision Research EP - 172 TI - Perceived motion in orientational afterimages: direction and speed VL - 41 SP - 161 KW - afterimage KW - bcs KW - dipole KW - motion KW - persistence KW - psychophysics AU - Francis, Gregory AU - Kim, Hyungjun PY - 2001/01// UR - http://dx.doi.org/10.1016/S0042-6989(00)00242-X ER -