The effect of strategy on pseudoneglect for luminance judgements

Nicholls, Michael E. R., Mattingley, Jason B. and Bradshaw, John L. (2005) The effect of strategy on pseudoneglect for luminance judgements. Cognitive Brain Research, 25 1: 71-77. doi:10.1016/j.cogbrainres.2005.04.006


Author Nicholls, Michael E. R.
Mattingley, Jason B.
Bradshaw, John L.
Title The effect of strategy on pseudoneglect for luminance judgements
Journal name Cognitive Brain Research   Check publisher's open access policy
ISSN 0926-6410
0006-8993
0169-328X
1385-299X
1872-6240
Publication date 2005
Sub-type Article (original research)
DOI 10.1016/j.cogbrainres.2005.04.006
Volume 25
Issue 1
Start page 71
End page 77
Total pages 7
Place of publication Amsterdam, Netherlands
Publisher Elsevier Science
Language eng
Abstract When judging the relative magnitude of the left and right sides of a stimulus, normal participants overestimate the leftward features (pseudoneglect). Although pseudoneglect and clinical neglect operate in opposite directions, the two phenomena may have a common cognitive and neural basis. For neglect, two strategies may be employed when inspecting horizontally aligned stimuli: (1) A global strategy where the stimuli are treated as a gestalt and asymmetries are detected or, (2) a comparison strategy where the qualities on the left and right sides of the stimuli are explicitly compared. To investigate the effect of these strategies on pseudoneglect, normal dextrals (n = 25 and 17) made two-alternative, forced-choice luminance discriminations between two mirror-reversed luminance gradients (greyscales). In an unseparated form, the stimuli are amenable to a global strategy. A comparison strategy was imposed by separating the stimuli into halves (Experiment 1) or quarters (Experiment 2). Despite the fact that the stimuli were equiluminant, participants predominantly chose the stimulus that was dark on the left as being darker overall in the unseparated condition. Response times were also faster for leftward responses. When the stimuli were separated into halves or quarters, the leftward bias was reduced, but not eliminated. The results demonstrate that both strategies contribute to pseudoneglect-though the global strategy may produce stronger pseudoneglect.
Keyword Neural basis of behavior
Cognition
Neglect
Line bisection
Right hemisphere
Asymmetry
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Queensland Brain Institute Publications
ERA 2012 Admin Only
 
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Created: Wed, 17 Oct 2007, 14:03:02 EST