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Research article summary:
Speed tuning of direction repulsion describes an inverted U-function.
Abstract Extract:
Direction repulsion describes the phenomenon in which observers typically overestimate the direction difference between two superimposed motions moving in different directions (Marshak & Sekuler, Science 205 (1979) 1399). Previous research has found ... (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(17):1847-53
Speed tuning of direction repulsion describes an inverted U-function.
Curran W, Benton CP
School of Psychology, Queen's University of Belfast, Belfast BT7 1NN, UK. w.curran@qub.ac.uk
Direction repulsion describes the phenomenon in which observers typically overestimate the direction difference between two superimposed motions moving in different directions (Marshak & Sekuler, Science 205 (1979) 1399). Previous research has found that, when a relatively narrow range of distractor speeds is considered, direction repulsion of a target motion increases monotonically with increasing speed of the distractor motion. We sought to obtain a more complete measurement of this speed-tuning function by considering a wider range of distractor speeds than has previously been used. Our results show that, contrary to previous reports, direction repulsion as a function of distractor speed describes an inverted U-function. For a target of 2.5 deg/s, we demonstrate that the attenuation of repulsion magnitude with high-speed disractors can be largely explained in terms of the reduced apparent contrast of the distractor. However, when we reduce target motion speed, this no longer holds. When considered from the perspective of Edwards et al.'s (Edwards, Badcock, & Smith, Vision Research 38 (1998) 1573) two global-motion channels, our results suggest that direction repulsion is speed dependent when the distractor and target motions are processed by different global-motion channels, but is not speed dependent when both motions are processed by the same, high-speed channel. The implications of these results for models of direction repulsion are discussed.
PMID : 12826108 [PubMed - Indexed for MEDLINE]
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Full Author Information
| First Name | LastName | Initials |
| William | Curran | W |
| Christopher P | Benton | CP |
Affiliation: School of Psychology, Queen's University of Belfast, Belfast BT7 1NN, UK. w.curran@qub.ac.uk
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Category links from this article:- Adaptation, Ocular - physiology
- Humans
- Motion Perception - physiology
- Observer Variation
- Optical Illusions - physiology
- Photic Stimulation - methods
- Reaction Time
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