Evidence for global motion interactions between first-order and second-order stimuli

Mather, George and Murdoch, Linda (1998) Evidence for global motion interactions between first-order and second-order stimuli. Perception, 27 (7). pp. 761-767. ISSN 0301-0066

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Abstract

Recent research indicates that the early stages of visual-motion analysis involve two parallel neural pathways, one conveying information from luminance-defined (first-order) image features, the other conveying information from texture-defined (second-order) features. It is still not clear whether these two pathways converge during later stages of global motion integration. According to one account they remain segregated, and feed separate global analyses. In the alternative account, all responses feed a common stage of global analysis. Two perceptual phenomena are universally held to result from interactions between detector responses during global motion integration - direction repulsion and motion capture. We conducted two psychophysical experiments on these phenomena to test for segregation of first-order and second-order responses during integration. Stimuli contained two components, either two random-block patterns transparently drifting in different directions (repulsion measurements), or a drifting square-wave grating superimposed on an incoherent random-block pattern (capture measurements). Repulsion and capture effects were measured when both stimulus components were the same order, and when one component was first order and the other was second order. Both effects were obtained for all combinations of first-order and second-order patterns. Repulsion effects were stronger with first-order inducing patterns, and capture effects were stronger with second-order inducers. The presence of perceptual interactions regardless of stimulus order strongly suggests that responses in first-order and second-order pathways interact during global motion analysis.

Item Type:Article
Keywords:article, computer graphics, human, movement perception, nerve tract, pattern recognition, physiology, psychologic test, Computer Graphics, Form Perception, Humans, Motion Perception, Neural Pathways, Psychological Tests
Subjects:B Subjects allied to Medicine > B140 Neuroscience
C Biological Sciences > C830 Experimental Psychology
Divisions:College of Social Science > School of Psychology
ID Code:16120
Deposited By: George Mather
Deposited On:03 Dec 2014 16:30
Last Modified:03 Dec 2014 16:30

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