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Research article summary:
When does illusory contour formation depend on contrast polarity?
Abstract Extract:
Performance on a shape discrimination task was used to investigate when, and to what extent, illusory contour formation depends upon contrast polarity. It was found that shape discrimination performance was markedly worse when contrast polarity reversed ... (Full abstract text below) Published 2003Aug
in Journal: Vision Res
(Language : eng)
Full Pubmed Extract
This information was retrieved, real-time, on your behalf from the public area of the Pubmed website:
1. Vision Res.
2003 Aug;43(18):1915-9
When does illusory contour formation depend on contrast polarity?
Spehar B, Clifford CW
School of Psychology, The University of New South Wales, Sydney, NSW 2052, Australia. b.spehar@unsw.edu.au
Performance on a shape discrimination task was used to investigate when, and to what extent, illusory contour formation depends upon contrast polarity. It was found that shape discrimination performance was markedly worse when contrast polarity reversed within inducers, changing abruptly at the corners, than between inducers. This difference was most evident for stimulus durations from 80-320 ms and corresponded to a doubling of the critical stimulus duration for shape discrimination to reach threshold. At longer stimulus durations the performance was at ceiling level for all configurations regardless of the distribution of contrast polarity variations. These data reconcile previous findings that contrast polarity reversals within inducers disrupt illusory contrast formation at an effective stimulus duration of 120 ms but not 1 s. We conclude that the processes involved in the perception of illusory figures are sensitive to contrast polarity variations in a manner constrained by grouping and completion of the inducing elements into occluded regions.
PMID : 12831754 [PubMed - Indexed for MEDLINE]
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Full Author Information
| First Name | LastName | Initials |
| Branka | Spehar | B |
| Colin W G | Clifford | CW |
Affiliation: School of Psychology, The University of New South Wales, Sydney, NSW 2052, Australia. b.spehar@unsw.edu.au
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