title: Impact of planned movement direction on judgments of visual locations.
abstract: The present study examined if and how the direction of planned hand movements affects the perceived direction of visual stimuli. In three experiments participants prepared hand movements that deviated regarding direction ("Experiment 1" and "2") or distance relative to a visual target position ("Experiment 3"). Before actual execution of the movement, the direction of the visual stimulus had to be estimated by means of a method of adjustment. The perception of stimulus direction was biased away from planned movement direction, such that with leftward movements stimuli appeared somewhat more rightward than with rightward movements. Control conditions revealed that this effect was neither a mere response bias, nor a result of processing or memorizing movement cues. Also, shifting the focus of attention toward a cued location in space was not sufficient to induce the perceptual bias observed under conditions of movement preparation ("Experiment 4"). These results confirm that characteristics of planned actions bias visual perception, with the direction of bias (contrast or assimilation) possibly depending on the type of the representations (categorical or metric) involved.
authors: Department of Psychology, University of Würzburg, Röntgenring 11, 97070, Würzburg, Germany, kirsch@psychologie.uni-wuerzburg.de.
authors: Wladimir
authors: W
authors: Kirsch
authors: Wilfried
authors: W
authors: Kunde
mesh_terms: D000293:Adolescent; D000328:Adult; D004215:Distance Perception / Q000502:physiology; D005260:Female; D006801:Humans; D007600:Judgment / Q000502:physiology*; D008297:Male; D009043:Motor Activity / Q000502:physiology*; D011597:Psychomotor Performance / Q000502:physiology*; D013028:Space Perception / Q000502:physiology*; D055815:Young Adult
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