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Paper   IPM / Cognitive Sciences / 8976
School of Cognitive Sciences
  Title:   Topographic map of motion aftereffect after saccade
1.  A. Ezzati
2.  S.R. Afraz
3.  A. Golzar
  Status:   In Proceedings
  Proceeding: The European Conference on Visual Perception (ECVP)
  Year:  2007
  Supported by:  IPM
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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