“School of Cognitive Sciences”
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| Paper IPM / Cognitive Sciences / 8975 |
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| Abstract: | |||||
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We measured potential effects of first- and second-order motion on the spatial
position of receptive fields (RF) in motion-detection hierarchy. After adaptation
with first- or second-order motion for 30 s, a dynamic counter-phase grating
(first-order adaptor) or a bistable stimulus composed of two identical
superimposed sinusoidal gratings with opposite motion direction )secondorder
adaptor) was presented as the test stimulus for 30 s. After adaptation, a
perceptual bias occurred in detection of motion direction (classical motion
aftereffect). Test stimuli were shown randomly in 8 different positions aligned
with the adaptor. Subjects' task was to report perceived direction of motion.
The fraction of time in which MAE was perceived in the expected direction
was used as a measure of MAE strength in each area. We found MAE
strength greater in the areas toward the direction of adaptation, both in the
area of adaptation ( p < 0.05) and outside it ( p < 5 0.05). This is congruent
with the idea that adaptation results in skewness of neuronal RFs toward the
direction of motion.
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