Are object- and space-based attentional biases both important to free-viewing perceptual asymmetries?

Nicholls, Michael E. R., Hughes, Georgina, Mattingley, Jason B. and Bradshaw, John L. (2004) Are object- and space-based attentional biases both important to free-viewing perceptual asymmetries?. Experimental Brain Research, 154 4: 513-520. doi:10.1007/s00221-003-1688-x


Author Nicholls, Michael E. R.
Hughes, Georgina
Mattingley, Jason B.
Bradshaw, John L.
Title Are object- and space-based attentional biases both important to free-viewing perceptual asymmetries?
Journal name Experimental Brain Research   Check publisher's open access policy
ISSN 0014-4819
1432-1106
Publication date 2004-01-01
Year available 2004
Sub-type Article (original research)
DOI 10.1007/s00221-003-1688-x
Open Access Status
Volume 154
Issue 4
Start page 513
End page 520
Total pages 8
Place of publication Berlin / Heidelberg
Publisher Springer
Language eng
Subject 1702 Cognitive Sciences
1109 Neurosciences
Abstract In contrast to unilateral neglect patients, who overattend to the right hemispace, normal participants attend more to the left: a phenomenon known as pseudoneglect. Two experiments examined whether pseudoneglect results from object- or space-based attentional biases. Normal participants (n=38, 22) made luminance judgments for two left/right mirror-reversed luminance gradients (greyscales task). The relative lateral position of the greyscales stimuli was manipulated so that object- and space-based coordinates were congruent or incongruent. A baseline condition was also included. A leftward bias, found for the baseline condition, was annulled in the incongruent condition, demonstrating an opposition of object- and space-based biases. The leftward bias was reduced in the congruent condition where object- and space-based biases were expected to be additive. This effect was attributed to extraneous factors, which were avoided in the second experiment by presenting the greyscales stimuli sequentially. Once again, no bias was observed in the incongruent condition where object- and space-based biases were opposed. The leftward bias in the congruent condition was the same as the baseline. The results can be explained by a combination of space- and object-based biases or by space-based biases alone and are discussed with reference to a variety of models, which describe the distribution of attention across space.
Keyword Neurosciences
neglect
left
right
pseudoneglect
coordinate frames
In-line Bisection
Mediating Cerebral Activation
Selective Spatial Attention
Visual-attention
Visuospatial Attention
Unilateral Neglect
Cross-over
Pseudoneglect
Modulation
Mechanisms
Q-Index Code C1
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Queensland Brain Institute Publications
 
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Citation counts: TR Web of Science Citation Count  Cited 15 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 17 Oct 2007, 22:36:29 EST