“School of Cognitive Sciences”
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| Paper IPM / Cognitive Sciences / 8976 |
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How does information from successive fixations due to saccadic eye
movements amalgamate into a single precept? Here, we report that visual
motion aftereffect (MAE) transfers across separate fixations when adaptor
and test are presented in the same spatial position. After adaptation with
coherently moving random-dot stimuli embedded in a 4*4 grid, subjects
changed their fixation to a newly presented fixation point. A neutral test
method was employed to measure MAE strength. Test stimulus was a small
moving random-dot pattern filling one of the randomly selected grid holes in a
5*6 grid. Test-stimulus area corresponded to three different regions with
regard to adaptor: the same retinal region, the same external spatial
coordinates, and none. We found that MAE strength was significantly
(P <0.05) greater in the same spatial position in comparison with non-adapted
areas. Interestingly, the highest MAE strength was found in the center of
spatial coordinates and not at the edge. We suggest that motion-selective
area MT and far extra striatevisual areas are responsible for spatial MAE.
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