Effects of prismatic adaptation on spatial gradients in unilateral neglect: A comparison of visual and auditory target detection with central attentional load

Eramudugolla, Ranmalee, Boyce, Angel, Irvine, Dexter R. F. and Mattingley, Jason B. (2010) Effects of prismatic adaptation on spatial gradients in unilateral neglect: A comparison of visual and auditory target detection with central attentional load. Neuropsychologia, 48 9: 2681-2692. doi:10.1016/j.neuropsychologia.2010.05.015


Author Eramudugolla, Ranmalee
Boyce, Angel
Irvine, Dexter R. F.
Mattingley, Jason B.
Title Effects of prismatic adaptation on spatial gradients in unilateral neglect: A comparison of visual and auditory target detection with central attentional load
Journal name Neuropsychologia   Check publisher's open access policy
ISSN 0028-3932
1873-3514
Publication date 2010-07-01
Year available 2010
Sub-type Article (original research)
DOI 10.1016/j.neuropsychologia.2010.05.015
Open Access Status DOI
Volume 48
Issue 9
Start page 2681
End page 2692
Total pages 12
Place of publication Oxford, United Kingdom
Publisher Pergamon
Language eng
Subject 3205 Experimental and Cognitive Psychology
2805 Cognitive Neuroscience
2802 Behavioral Neuroscience
Abstract Prismatic adaptation is increasingly recognised as an effective procedure for rehabilitating symptoms of unilateral spatial neglect - producing relatively long-lasting improvements on a variety of spatial attention tasks. The mechanisms by which the aftereffects of adaptation change neglect patients' performance on these tasks remain controversial. It is not clear, for example, whether adaptation directly influences the pathological ipsilesional attention bias that underlies neglect, or whether it simply changes exploratory motor behaviour. Here we used visual and auditory versions of a target detection task with a secondary task at fixation. Under these conditions, patients with neglect demonstrated a spatial gradient in their ability to orient to the brief, peripheral visual or auditory targets. Following prism adaptation, we found that overall performance on both the auditory and visual task improved, however, most patients in our sample did not show changes in their visual or auditory spatial gradient of attention, despite adequate aftereffects of adaptation and significant improvement in neglect on visual cancellation. Although there were individual cases that suggested prism-induced changes in visual target detection, and even reversal of the visual spatial gradient, such cases were not evident for the auditory modality. The findings indicate that spatial gradients in stimulus-driven attention may be less responsive to the effects of prism adaptation than neglect symptoms in voluntary orienting and exploratory behaviour. Individual factors such as lesion site and symptom severity may also determine the expression of prism effects on spatial neglect.
Keyword Unilateral spatial neglect
Auditory perception
Visual attention
Attentional load
Prism adaptation
Q-Index Code C1
Q-Index Status Confirmed Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Official 2011 Collection
Queensland Brain Institute Publications
School of Psychology Publications
 
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Created: Sun, 22 Aug 2010, 10:05:24 EST