Dual multiple-scale processing for motion in the human visual system. Export

@article{Nishida97:Motion, abstract = {A number of psychophysical and physiological studies have suggested that first- and second-order motion signals are processed, at least initially, by independent pathways, and that the two pathways both consist of multiple motion-detecting channels that are each narrowly tuned to a different spatial scale (spatial frequency). However, the precise number and nature of the mechanisms that subserve first- and second-order motion perception in human vision remain both controversial and speculative. We sought to clarify this issue by conducting selective adaptation experiments, in which modulation-depth thresholds for identifying the direction of stimulus motion of first-order (luminance-defined) and second-order (contrast-defined) drifting gratings were measured both prior to and following adaptation to motion. The drift direction, spatial frequency and stimulus type (either first- or second-order) of the adaptation and test stimuli were systematically manipulated. When the adaptation and test stimuli were either both first-order gratings or both second-order gratings, robust elevations of direction-identification thresholds were found and, importantly, these aftereffects exhibited both direction-selectivity and spatial-frequency selectivity. Cross-over-adaptation effects between first- and second-order gratings were also sometimes observed, but were very weak and not spatial-frequency selective. These findings give direct support for the existence of multiple-scale processing for first- and second-order motion in the human visual system and provide additional evidence that the two varieties of motion are initially processed by independent pathways.}, address = {Information Science Research Laboratory, NTT Basic Research Laboratories, Kanagawa, Japan. nishida@apollo3.brl.ntt.co.jp}, author = {Nishida, S. and Ledgeway, T. and Edwards, M.}, citeulike-article-id = {2616740}, citeulike-linkout-0 = {http://view.ncbi.nlm.nih.gov/pubmed/9373668}, citeulike-linkout-1 = {http://www.hubmed.org/display.cgi?uids=9373668}, issn = {0042-6989}, journal = {Vision Res}, keywords = {motion, separable, vision}, month = {October}, number = {19}, pages = {2685--2698}, posted-at = {2008-03-31 17:31:32}, priority = {2}, title = {Dual multiple-scale processing for motion in the human visual system.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/9373668}, volume = {37}, year = {1997} }

TY - JOUR ID - Nishida97:Motion L3 - citeulike-article-id:2616740 N2 - A number of psychophysical and physiological studies have suggested that first- and second-order motion signals are processed, at least initially, by independent pathways, and that the two pathways both consist of multiple motion-detecting channels that are each narrowly tuned to a different spatial scale (spatial frequency). However, the precise number and nature of the mechanisms that subserve first- and second-order motion perception in human vision remain both controversial and speculative. We sought to clarify this issue by conducting selective adaptation experiments, in which modulation-depth thresholds for identifying the direction of stimulus motion of first-order (luminance-defined) and second-order (contrast-defined) drifting gratings were measured both prior to and following adaptation to motion. The drift direction, spatial frequency and stimulus type (either first- or second-order) of the adaptation and test stimuli were systematically manipulated. When the adaptation and test stimuli were either both first-order gratings or both second-order gratings, robust elevations of direction-identification thresholds were found and, importantly, these aftereffects exhibited both direction-selectivity and spatial-frequency selectivity. Cross-over-adaptation effects between first- and second-order gratings were also sometimes observed, but were very weak and not spatial-frequency selective. These findings give direct support for the existence of multiple-scale processing for first- and second-order motion in the human visual system and provide additional evidence that the two varieties of motion are initially processed by independent pathways. IS - 19 JF - Vision Res SN - 0042-6989 AD - Information Science Research Laboratory, NTT Basic Research Laboratories, Kanagawa, Japan. nishida@apollo3.brl.ntt.co.jp EP - 2698 TI - Dual multiple-scale processing for motion in the human visual system. VL - 37 SP - 2685 KW - motion KW - separable KW - vision AU - Nishida, S AU - Ledgeway, T AU - Edwards, M PY - 1997/10// UR - http://view.ncbi.nlm.nih.gov/pubmed/9373668 ER -