Fractal rotation isolates mechanisms for form-dependent motion in human vision

被引:8
作者
Benton, Christopher P.
O'Brien, Justin M. D.
Curran, W.
机构
[1] Univ Bristol, Dept Expt Psychol, Bristol BS8 1TU, Avon, England
[2] Brunel Univ, Ctr Cognit & Neuroimaging, Uxbridge UB8 3PH, Middx, England
[3] Queens Univ Belfast, Sch Psychol, Belfast BT7 1NN, Antrim, North Ireland
关键词
motion; visual perception; after-effect; psychophysics; feature tracking;
D O I
10.1098/rsbl.2007.0056
中图分类号
Q [生物科学];
学科分类号
07 ; 0710 ; 09 ;
摘要
Here, we describe a motion stimulus in which the quality of rotation is fractal. This makes its motion unavailable to the translation-based motion analysis known to underlie much of our motion perception. In contrast, normal rotation can be extracted through the aggregation of the outputs of translational mechanisms. Neural adaptation of these translation-based motion mechanisms is thought to drive the motion after-effect, a phenomenon in which prolonged viewing of motion in one direction leads to a percept of motion in the opposite direction. We measured the motion after-effects induced in static and moving stimuli by fractal rotation. The after-effects found were an order of magnitude smaller than those elicited by normal rotation. Our findings suggest that the analysis of fractal rotation involves different neural processes than those for standard translational motion. Given that the percept of motion elicited by fractal rotation is a clear example of motion derived from form analysis, we propose that the extraction of fractal rotation may reflect the operation of a general mechanism for inferring motion from changes in form.
引用
收藏
页码:306 / 308
页数:3
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