Unilateral hemispheric activation does not affect free-viewing perceptual asymmetries

Nicholls, MER, Bradshaw, JL and Mattingley, JB (2001) Unilateral hemispheric activation does not affect free-viewing perceptual asymmetries. Brain And Cognition, 46 1-2: 219-223. doi:10.1016/S0278-2626(01)80070-1


Author Nicholls, MER
Bradshaw, JL
Mattingley, JB
Title Unilateral hemispheric activation does not affect free-viewing perceptual asymmetries
Journal name Brain And Cognition   Check publisher's open access policy
ISSN 0278-2626
Publication date 2001-01-01
Sub-type Article (original research)
DOI 10.1016/S0278-2626(01)80070-1
Volume 46
Issue 1-2
Start page 219
End page 223
Total pages 5
Place of publication San Diego
Publisher Academic Press Inc
Language eng
Abstract Strong leftward perceptual biases have been reported for the selection of the darker of two left/right mirror-reversed luminance gradients under free-viewing conditions. This study investigated the effect of unilateral hemispheric activation on this leftward bias in two groups of dextrals (N = 52 and N = 24). In Experiment 1, activation was manipulated by asking participants to tap with their left or right fingers along their midline. In Experiment 2, participants clenched their left or right hands in their respective hemispaces. Participants selected the stimulus that was darker on the left-hand side 73% of the time. Despite manipulations of activation strength and hemispace, activation had no effect on the asymmetry. If activation was important, the leftward bias should have been enhanced when the left hand/right hemisphere was active and reduced (or reversed) when the right hand/left hemisphere was active. The contribution of left-to-right scanning biases to free-viewing perceptual asymmetries is discussed as an alternative. (C) 2001 Academic press.
Keyword Neurosciences
Psychology, Experimental
Visual Line Bisection
Neglect
Hand
Pseudoneglect
Hemispace
Attention
Task
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

Document type: Journal Article
Sub-type: Article (original research)
Collection: Queensland Brain Institute Publications
 
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Created: Wed, 17 Oct 2007, 20:57:28 EST