Impaired working memory for location but not for colour or shape in visual neglect: A comparison of parietal and non-parietal lesions

Pisella, L, Berberovic, N and Mattingley, JB (2004) Impaired working memory for location but not for colour or shape in visual neglect: A comparison of parietal and non-parietal lesions. Cortex, 40 2: 379-390. doi:10.1016/S0010-9452(08)70132-1


Author Pisella, L
Berberovic, N
Mattingley, JB
Title Impaired working memory for location but not for colour or shape in visual neglect: A comparison of parietal and non-parietal lesions
Journal name Cortex   Check publisher's open access policy
ISSN 0010-9452
Publication date 2004-01-01
Sub-type Article (original research)
DOI 10.1016/S0010-9452(08)70132-1
Volume 40
Issue 2
Start page 379
End page 390
Total pages 12
Place of publication Milan
Publisher Masson Divisione Periodici
Language eng
Abstract Patients with spatial neglect due to right hemisphere pathology may show 'revisiting' behaviour during visual search and cancellation tasks, such that previously encountered targets are treated as if they are new discoveries. Revisiting behaviour is particularly evident when no visible trace is left to inform patients that a particular target has already been detected (Husain et al., 2001; Wojciulik et al., 2001), implying that spatial working memory may be impaired in neglect. To test whether working memory for location is selectively impaired relative to memory for colour and shape, we compared performances of right hemisphere neglect patients with parietal (n = 4) and non-parietal (n = 4) lesions on a change detection task. Patients were presented with a matrix containing four objects in different positions, and required to detect a change in the location, colour or shape of one of the objects following presentation of a brief visual mask. Parietal patients were selectively impaired in detecting location changes, regardless of the horizontal position of the object in the matrix, relative to colour and shape changes. This deficit of spatial working memory was not apparent for neglect patients with lesions that spared the parietal cortex. We conclude that the human parietal cortex is crucially involved in the updating and maintenance of spatial representations across saccades, and that neglect arising from parietal damage causes impairment in these re-mapping mechanisms.
Keyword Behavioral Sciences
Neurosciences
attention
change detection
parietal lobe
right hemisphere
spatial neglect
spatial working memory
Unilateral Neglect
Change-blindness
Eye-movements
Attention
Cortex
Representation
Awareness
Humans
Hemineglect
Activation
Q-Index Code C1

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, 22:53:05 EST