The greyscales task: a perceptual measure following unilateral hemispheric of attentional bias damage

Mattingley, JB, Berberovic, N, Corben, L, Slavin, MJ, Nicholls, MER and Bradshaw, JL (2004) The greyscales task: a perceptual measure following unilateral hemispheric of attentional bias damage. Neuropsychologia, 42 3: 387-394. doi:10.1016/j.neuropsychologia.2003.07.007

Author Mattingley, JB
Berberovic, N
Corben, L
Slavin, MJ
Nicholls, MER
Bradshaw, JL
Title The greyscales task: a perceptual measure following unilateral hemispheric of attentional bias damage
Journal name Neuropsychologia   Check publisher's open access policy
ISSN 0028-3932
Publication date 2004-01-01
Year available 2004
Sub-type Article (original research)
DOI 10.1016/j.neuropsychologia.2003.07.007
Open Access Status
Volume 42
Issue 3
Start page 387
End page 394
Total pages 8
Place of publication Oxford
Publisher Pergamon-elsevier Science Ltd
Language eng
Abstract The two cerebral hemispheres in humans have been suggested to control contralaterally opposed attentional biases. These biases may be revealed by unilateral hemispheric damage, which often causes contralesional spatial neglect, particularly when the right hemisphere (RH) is affected. Subtle attentional biases have also been observed in normal observers in tasks requiring judgements of horizontal spatial extent, brightness, numerosity and size. Here, we examined attentional biases for judging the darker of two left-right mirror-reversed brightness gradients under conditions of free viewing (the greyscales task). We compared performances of patients with damage to the RH (n = 78) and left hemisphere (LH; n = 20) with those of normal controls (n = 20). Controls showed a small but significant leftward bias, implying a subtle asymmetry favouring the RH. In contrast, RH and LH patients showed extreme rightward and leftward biases, respectively, both of which differed significantly from that of controls. For the patient groups, performance on clinical tests of neglect (cancellation and line bisection) did not predict their greyscales scores. Pathological biases were present in patients without clinical neglect or visual field defects, suggesting that the attentional bias measured by the greyscales task can be dissociated from clinical neglect and visual sensory loss. The greyscales task offers an efficient means of quantifying pathological attentional biases in unilateral lesion patients; it is easy to administer and score, and may be particularly useful for clinical trials of recovery and rehabilitation following stroke. (C) 2003 Elsevier Ltd. All rights reserved.
Keyword Behavioral Sciences
Psychology, Experimental
line bisection
neuropsychological assessment
spatial neglect
Visual Hemi-neglect
Line Bisection
Spatial Neglect
Parietal Lobe
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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Created: Wed, 17 Oct 2007, 22:33:21 EST