Prism adaptation reverses the local processing bias in patients with right temporo-parietal junction lesions
Identifieur interne : 001321 ( Pmc/Curation ); précédent : 001320; suivant : 001322Prism adaptation reverses the local processing bias in patients with right temporo-parietal junction lesions
Auteurs : Janet H. Bultitude ; Robert D. Rafal ; Alexandra ListSource :
- Brain [ 0006-8950 ] ; 2009.
Abstract
Lesions to the right temporo-parietal cortex commonly result in hemispatial neglect. Lesions to the same area are also associated with hyperattention to local details of a scene and difficulty perceiving the global structure. This local processing bias is an important factor contributing to neglect and may contribute to the higher prevalence of the disorder following right compared with left hemisphere strokes. In recent years, visuomotor adaptation to rightward-shifting prisms has been introduced as a promising treatment for hemispatial neglect. Explanations for these improvements have generally described a leftward realignment of attention, however, the present investigation provides evidence that prism adaptation reduces the local processing bias. Five patients with right temporal-parietal junction lesions were asked to identify the global or local levels of hierarchical figures before and after visuomotor adaptation to rightward-shifting prisms. Prior to prism adaptation the patients had difficulty ignoring the local elements when identifying the global component. Following prism adaptation, however, this pattern was reversed, with greater global interference during local level identification. The results suggest that prism adaptation may improve non-spatially lateralized deficits that contribute to the neglect syndrome.
Url:
DOI: 10.1093/brain/awp096
PubMed: 19416951
PubMed Central: 2724913
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PMC:2724913Le document en format XML
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<front><div type="abstract" xml:lang="en"><p>Lesions to the right temporo-parietal cortex commonly result in hemispatial neglect. Lesions to the same area are also associated with hyperattention to local details of a scene and difficulty perceiving the global structure. This local processing bias is an important factor contributing to neglect and may contribute to the higher prevalence of the disorder following right compared with left hemisphere strokes. In recent years, visuomotor adaptation to rightward-shifting prisms has been introduced as a promising treatment for hemispatial neglect. Explanations for these improvements have generally described a leftward realignment of attention, however, the present investigation provides evidence that prism adaptation reduces the local processing bias. Five patients with right temporal-parietal junction lesions were asked to identify the global or local levels of hierarchical figures before and after visuomotor adaptation to rightward-shifting prisms. Prior to prism adaptation the patients had difficulty ignoring the local elements when identifying the global component. Following prism adaptation, however, this pattern was reversed, with greater global interference during local level identification. The results suggest that prism adaptation may improve non-spatially lateralized deficits that contribute to the neglect syndrome.</p>
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<article-categories><subj-group subj-group-type="heading"><subject>Original Articles</subject>
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<title-group><article-title>Prism adaptation reverses the local processing bias in patients with right temporo-parietal junction lesions</article-title>
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<contrib-group><contrib contrib-type="author" corresp="yes"><name><surname>Bultitude</surname>
<given-names>Janet H.</given-names>
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<contrib contrib-type="author"><name><surname>Rafal</surname>
<given-names>Robert D.</given-names>
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<contrib contrib-type="author"><name><surname>List</surname>
<given-names>Alexandra</given-names>
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<aff>Wolfson Centre for Clinical and Cognitive Neuroscience, School of Psychology, Bangor University, Bangor, Gwynedd, UK</aff>
<author-notes><corresp>Correspondence to: Janet H. Bultitude, School of Psychology, Brigantia Building, Penrallt Rd, Bangor University, Bangor, Gwynedd, LL57 2AS, UK E-mail: <email>j.bultitude@bangor.ac.uk</email>
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<pub-date pub-type="ppub"><month>6</month>
<year>2009</year>
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<pub-date pub-type="epub"><day>4</day>
<month>5</month>
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<volume>132</volume>
<issue>6</issue>
<fpage>1669</fpage>
<lpage>1677</lpage>
<history><date date-type="received"><day>31</day>
<month>10</month>
<year>2008</year>
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<date date-type="rev-recd"><day>6</day>
<month>3</month>
<year>2009</year>
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<date date-type="accepted"><day>10</day>
<month>3</month>
<year>2009</year>
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<permissions><copyright-statement>© The Author (2009). Published by Oxford University Press on behalf of the Guarantors of Brain. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org</copyright-statement>
<copyright-year>2009</copyright-year>
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<abstract><p>Lesions to the right temporo-parietal cortex commonly result in hemispatial neglect. Lesions to the same area are also associated with hyperattention to local details of a scene and difficulty perceiving the global structure. This local processing bias is an important factor contributing to neglect and may contribute to the higher prevalence of the disorder following right compared with left hemisphere strokes. In recent years, visuomotor adaptation to rightward-shifting prisms has been introduced as a promising treatment for hemispatial neglect. Explanations for these improvements have generally described a leftward realignment of attention, however, the present investigation provides evidence that prism adaptation reduces the local processing bias. Five patients with right temporal-parietal junction lesions were asked to identify the global or local levels of hierarchical figures before and after visuomotor adaptation to rightward-shifting prisms. Prior to prism adaptation the patients had difficulty ignoring the local elements when identifying the global component. Following prism adaptation, however, this pattern was reversed, with greater global interference during local level identification. The results suggest that prism adaptation may improve non-spatially lateralized deficits that contribute to the neglect syndrome.</p>
</abstract>
<kwd-group><kwd>hemispatial neglect</kwd>
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<kwd>prism adaptation</kwd>
<kwd>hierarchical processing</kwd>
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