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Coherent motion perception fails at low contrast

Lookup NU author(s): Dr Louise Delicato, Professor Andrew Derrington


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If the Fourier components of a moving plaid have similar temporal frequency, spatial frequency and contrast, coherent motion is perceived according to subjective judgements. We have devised a more objective method of determining the conditions required for coherent motion. Moving plaid stimuli were created with one stationary component. Plaids with a stationary component always have a single perceived direction of motion, which is determined by the presence or absence of coherent motion. In a temporal two-interval forced-choice paradigm we used a direction discrimination task to investigate the effect of varying the temporal and spatial characteristics of the Fourier components and pattern contrast on the probability of coherent motion perception. Agreement across observers regarding the conditions required for coherent motion was excellent using this more objective method. We find that patterns do not produce coherent motion when presented at contrast threshold, irrespective of how similar the Fourier components are. We also confirm that when the temporal frequency, spatial frequency and contrast of the gratings are sufficiently similar, observers report the direction of motion indicating coherent motion. © 2005 Elsevier Ltd. All rights reserved.

Publication metadata

Author(s): Delicato LS, Derrington AM

Publication type: Article

Publication status: Published

Journal: Vision Research

Year: 2005

Volume: 45

Issue: 17

Pages: 2310-2320

Print publication date: 01/08/2005

ISSN (print): 0042-6989

ISSN (electronic): 1878-5646

Publisher: Elsevier


DOI: 10.1016/j.visres.2005.02.020

PubMed id: 15924944


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