Cite as:
Zimmermann E, Arrighi R, Pooresmaeili A, Morrone M C, Burr D C, 2010, "Size adaptation: Effects on perception and action" Perception 39 ECVP Abstract Supplement, page 76
Size adaptation: Effects on perception and action
E Zimmermann, R Arrighi, A Pooresmaeili, M C Morrone, D C Burr
All primary sensory attributes are adaptable. Maintained prolonged exposure to a specific stimulus property induces perceptual adaptation aftereffects, usually in the opposite direction to the adaptor. We applied this technique to investigate adaptation of stimulus size and found strong visual aftereffects. Adaptation to stationary stimuli of 10 deg diameter caused smaller stimuli (5 deg) to be perceived as smaller (about 30%) and larger stimuli (12 deg) to be perceived as larger (about 15%). The illusion also affected spatial position information: Visual space perception was measured by judging the apparent spatial location of briefly flashed bars. Stimuli flashed near to the adapted location were perceived shifted in the direction of the size aftereffect, while stimuli flashed in the center of the adapted location were perceived veridically. To test whether adaptation affected actions as well as perception we asked subjects to saccade to the border of an object. For reactive saccades, amplitudes were decreased as if the saccade had been executed to a larger object. Express saccades, however, tended to be veridical, thus showing that they were triggered by a signal representing the physical not the illusory target position .
[Supported by ‘STANIB’ (FP7 ERC)]
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