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TWK: 7th Tübingen Perception Conference
30th Jan - 1st Feb 2004
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Visual Localization and Feature Processing During Eye Movements
Markus Lappe (Westfälische Wilhelms-Universität Münster)
Localization of briefly flashed stimuli around the time of a saccade Visual localization is distorted for stimuli that are briefly flashed in the wake of a saccadic eye movement. Objects flashed in the dark appear shifted in the direction of the eye movement. Objects flashed on a structured background appear compressed towards the saccade target. Also, the apparent position of the saccade target is influenced by a presaccadically flashed object. In the dark, the saccade target position appears shifted towards the flashed object. In the presence of a background, the saccade target is accurately localized. These results suggest that perisaccadic mislocalization arises from compression of the visual distances between elements of the presaccadic scene plus an uncertainty about postsaccadic target location. The compression affects only the location of the presented objects, not their visual properties or identity. When multiple objects with different colors are flashed before a saccade they appear to overlap in one place but their individual colors can still be distinguished. |
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