ECVP 2006 Abstract

Cite as:
Wattam-Bell J, Braddick O J, Atkinson J, 2006, "Interaction between global form and motion processing" Perception 35 ECVP Abstract Supplement

Interaction between global form and motion processing

J Wattam-Bell, O J Braddick, J Atkinson

Global form and global motion are thought to be processed separately by the ventral and dorsal visual streams respectively. Form and motion coherence thresholds are increasingly used as independent measures of normal and abnormal function and development of the two streams. But how independent are they? To assess this, we have examined the effect of motion masks on form coherence thresholds, and vice versa. The form stimulus consisted of dots arranged in short concentric arcs to produce a static global circular organisation. The motion stimulus contained dots moving along similar arcs, resulting in global rotation. Coherence was varied by changing the proportion of arcs that were concentrically arranged, with the rest being randomly oriented, and coherence thresholds for detecting the concentric organisation were measured in a 2IFC task. Form and motion thresholds were measured with no mask, and with superimposed masks of coherence between 0% and 32%. Across all conditions, coherence thresholds lay between 6% and 9% and were unaffected by the presence or coherence of the masks in the other domain. These results suggest little or no interaction between form and motion at either local or global levels for these stimuli; they provide effective measures of two independent systems.
[Supported by MRC programme grant G7908507.]

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