Effects of prismatic adaptation on judgements of spatial extent in peripersonal and extrapersonal space

Berberovic, N and Mattingley, JB (2003) Effects of prismatic adaptation on judgements of spatial extent in peripersonal and extrapersonal space. Neuropsychologia, 41 4: 493-503. doi:10.1016/S0028-3932(02)00090-8


Author Berberovic, N
Mattingley, JB
Title Effects of prismatic adaptation on judgements of spatial extent in peripersonal and extrapersonal space
Journal name Neuropsychologia   Check publisher's open access policy
ISSN 0028-3932
Publication date 2003-01-01
Sub-type Article (original research)
DOI 10.1016/S0028-3932(02)00090-8
Volume 41
Issue 4
Start page 493
End page 503
Total pages 11
Place of publication Oxford
Publisher Pergamon-elsevier Science Ltd
Language eng
Abstract Recent research has shown that visuomotor adaptation to a lateral displacement of the visual field induces significant perceptual aftereffects in normal observers, and in right hemisphere patients with spatial neglect [Neuroreport 11 (2000) 1899; Nature 395 (1998) 166]. These findings suggest that adaptive realignment following prism exposure induces a bias in visual space perception, even in tasks that require no visually guided motor response. Given recent neurophysiological and behavioural data suggesting independent visual representations for peripersonal and extrapersonal space, here we asked whether adaptive aftereffects extend beyond participants' immediate reaching space to stimuli presented beyond arms' reach (i.e. in extrapersonal space). Thirty-two participants underwent adaptive realignment to 10degrees left- or right-displacing wedge-prisms. Before and after adaptation participants performed a visual landmark task that required estimation of the midpoint of horizontal line stimuli. There was a significant rightward shift in visual midpoint judgements following adaptation to left-deviating prisms, which was evident in both peripersonal and extrapersonal space. Paradoxically, a significant rightward shift also occurred following adaptation to right-deviating prisms, but only in extrapersonal space. We suggest that the pattern of adaptive aftereffects observed reflects the different reference frames used by participants to perform spatial judgements in peripersonal and extrapersonal space. We also propose that an underlying hemispheric asymmetry in the processing of spatial errors during adaptation may contribute to the direction of aftereffects in both normal observers, and in patients with unilateral lesions. (C) 2002 Elsevier Science Ltd. All rights reserved.
Keyword Behavioral Sciences
Neurosciences
Psychology, Experimental
allocentric coordinates
attention
egocentric coordinates
hemispheric asymmetry
line bisection
spatial neglect
Right-hemisphere Damage
Line Bisection Tasks
Unilateral Neglect
Hemispatial Neglect
Far Space
Attention
Displacement
Cortex
Vision
Bias
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

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 62 times in Thomson Reuters Web of Science Article | Citations
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Created: Wed, 17 Oct 2007, 21:56:02 EST