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| Research article summary (published 30 Dec 2002): |
Timing accuracy in motion extrapolation: reverse effects of target size and visible extent of motion at low and high speeds.
Full Abstract
By varying target size, speed, and extent of visible motion we examined the timing accuracy in motion extrapolation. Small or large targets (0.2 or 0.8 deg) moved at either 2.5, 5, or 10 deg s(-1) across a horizontal path (2.5 or 10 deg) and then vanished behind an occluder. Observers responded when they judged that the target had reached a randomly specified position between 0 and 12 deg. With higher speeds, the timing accuracy (the reverse of absolute error) was better for small than for large targets, and for long than for short visible extents. With low speed, these effects were reversed. In addition, while long visible extents yielded a greater accuracy at high than at low speeds, for short extents the accuracy was much better with the low speed. The findings suggest that, when extrapolating motion with targets and visible extents of different sizes, the visual system implements different scaling algorithms depending on target speed. At higher speeds, processing of visible and occluded motion is likely to share a common scaling mechanism based on velocity transposition. Reverse effects for target size and extent of visible motion at low and high speeds converge with the assumption of two distinct speed-tuned motion-processing mechanisms in human vision.
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Author information
Author/s: Sokolov, Alexander (A); Pavlova, Marina (M);
Affiliation: Institut für Psychologie, Technische Universität Braunschweig, Spielmannstrasse 19, D 38106 Braunschweig, Germany. a.sokolov(-atsign-)tu-bs.de
Journal and publication information
Publication Type: Journal Article
Journal: Perception (Perception), published in England. (Language: eng)
Reference: 2003-; vol 32 (issue 6) : pp 699-706
Dates: Created 2003/08/01; Completed 2003/10/09; Revised 2004/11/17;
PMID: 12892430, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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