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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.
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
URL: http://dx.doi.org/10.1016/j.visres.2005.02.020
DOI: 10.1016/j.visres.2005.02.020
PubMed id: 15924944
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