Motion-induced position shifts occur after motion integration

Mather, George and Pavan, Andrea (2009) Motion-induced position shifts occur after motion integration. Vision research, 49 (23). pp. 2741-2746. ISSN 0042-6989

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Motion-induced position shifts occur after motion integration

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Abstract

Low-level motion processing in the primate visual system involves two stages. The first stage (in V1) contains
specialised motion sensors which respond to local retinal motion, and the second stage (in MT)pools local signals to encode rigid surface motion. Recent psychophysical research shows that motion signals influence the perceived position of an object (motion-induced position shift, MIPS). In the present paper we investigate the role played by the two processing stages in generating MIPS. We compared MIPS
induced by single grating components (Gabor patches) to MIPS induced by plaids created by combining pairs of components. If motion signals at the lowest level of motion analysis (V1) influence position assignment, MIPS from plaids should reflect the position shift induced by each component when presented separately. On the other hand, if signals generated in MT (or later) influence perceived position, then MIPS from plaids should be consistent with a motion integration computation on the components.
Results showed that MIPS from plaids is larger than the MIPS obtained from individual components, and can be explained by the output of an integration process that combines intersection-of-constraints and vector-sum computations.

Keywords:Motion perception, Motion-induced position shift, Motion integration
Subjects:C Biological Sciences > C800 Psychology
C Biological Sciences > C850 Cognitive Psychology
Divisions:College of Social Science > School of Psychology
ID Code:4741
Deposited On:13 Oct 2011 17:38

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