Dorsal stream contributions to perceptual asymmetries

Thomas, Nicole A., Schneider, Oliver, Gutwin, Carl, and Elias, Lorin J. (2012) Dorsal stream contributions to perceptual asymmetries. Journal of the International Neuropsychological Society, 18 (2). pp. 251-259.

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Neurologically normal individuals show a bias toward the left side of space, referred to as pseudoneglect due to its similarity to clinical hemispatial neglect. The left bias appears to be stronger in the lower visual field during free-viewing, which could result from preferential dorsal stream processing. The current experiments used modified greyscales tasks, incorporating motion and isoluminant color, to explore whether targeting dorsal or ventral stream processing influenced the strength of the left bias. It was expected that the left bias would be stronger on the motion task than on a task incorporating isoluminant color. In Study 1, similar left biases were observed during prolonged viewing for luminance, motion and red, but not green color. The unexpected finding of a leftward bias for red under prolonged viewing was replicated in Study 2. A leftward bias for motion was also evident during 150 ms viewing in Study 2. In Study 3, the left bias was not apparent when using a blue/yellow condition, suggesting the left bias for red under prolonged viewing was likely unique to red. Furthermore, the leftward bias for red disappeared under brief viewing conditions. It is suggested that dorsal stream processing likely underlies visual field differences in pseudoneglect.

Item ID: 52463
Item Type: Article (Research - C1)
ISSN: 1469-7661
Keywords: visuospatial attention; global motion; isoluminant color; presentation time; pseudoneglect
Funders: Natural Sciences and Engineering Research Council of Canada (NSERC)
Projects and Grants: NSERC fellowship grant
Date Deposited: 18 Jul 2018 05:09
FoR Codes: 17 PSYCHOLOGY AND COGNITIVE SCIENCES > 1701 Psychology > 170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology) @ 50%
17 PSYCHOLOGY AND COGNITIVE SCIENCES > 1701 Psychology > 170112 Sensory Processes, Perception and Performance @ 50%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970117 Expanding Knowledge in Psychology and Cognitive Sciences @ 100%
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