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Title: Reaction time asymmetries between expansion and contraction
Author: López i Moliner, Joan
Keywords: Percepció visual
Temps de reacció (Psicologia)
Visual perception
Reaction time (Psychology)
Issue Date: 2005
Publisher: Universitat de València
Abstract: Different asymmetries between expansion and contraction (radial motions) have been reported in the literature. Often these patterns have been regarded as implying different channels for each type of radial direction (outward versus inwards) operating at a higher level of visual motion processing. In two experiments (detection and discrimination tasks) we report reaction time asymmetries between expansion and contraction. Power functions were fitted to the data. While an exponent of 0.5 accounted for the expansion data better, a value of unity yielded the best fit for the contraction data. Instead of interpreting these differences as corresponding to different higher order motion detectors, we regard these findings as reflecting the fact that expansion and contraction tap two distinct psychophysical input channels underlying the processing of fast and slow velocities respectively.
Note: Reproducció del document publicat a:
It is part of: Psicologica, 2005, vol. 26, p. 139-146
ISSN: 0211-2159
Appears in Collections:Articles publicats en revistes (Cognició, Desenvolupament i Psicologia de l'Educació)

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