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dc.contributor.authorJenkinson, P.
dc.contributor.authorEdelstyn, N.M.J.
dc.contributor.authorEllis, S.J.
dc.date.accessioned2012-11-29T11:29:56Z
dc.date.available2012-11-29T11:29:56Z
dc.date.issued2009
dc.identifier.citationJenkinson , P , Edelstyn , N M J & Ellis , S J 2009 , ' Imagining the impossible : motor representations in anosognosia for hemiplegia ' , Neuropsychologia , vol. 47 , no. 2 , pp. 481-488 . https://doi.org/10.1016/j.neuropsychologia.2008.10.004
dc.identifier.issn0028-3932
dc.identifier.otherPURE: 193824
dc.identifier.otherPURE UUID: 00567e2b-c91b-453d-99c8-bce20b961020
dc.identifier.otherdspace: 2299/5580
dc.identifier.otherScopus: 58849156354
dc.identifier.otherORCID: /0000-0001-6887-0457/work/32418417
dc.identifier.urihttp://hdl.handle.net/2299/9248
dc.descriptionOriginal article available at: http://www.sciencedirect.com/ Copyright Elsevier
dc.description.abstractAnosognosia for hemiplegia (AHP) is characterised by poor insight or underestimation of hemiplegia after brain injury. Recent explanations of AHP have used an established ‘forward model’, which proposes that normal motor awareness involves comparing the predicted and actual sensory consequences of movements. These accounts propose that AHP patients may be able to form representations of their intended movements (i.e., motor representations), but fail to register discrepancy between intended and actual movements. A prediction arising from this proposal is that AHP patients are able to generate motor representations involving their hemiplegic limb(s). Our study provides the first direct examination of this prediction in patients with AHP. We used an existing ‘grip selection task’, which investigates motor representations by comparing how patients would grasp an object and how they actually grasp the same object. Eight right hemisphere stroke patients with AHP, 10 control patients (non-AHP), and 22 age-matched healthy volunteers (HVs) completed the task. Results showed that HVs outperformed both AHP and non-AHP patients in their motor representations for the hemiplegic limb; however, the performance of AHP and non-AHP patients did not differ significantly. Motor representations for the intact limb were lower than normal in AHP patients, whereas performance in non-AHP patients was midway between the AHP and HV groups. Findings suggested that the ability to form motor representations lie on a continuum, but that impaired motor representations for the paralysed limb cannot account for AHP. Distorted motor representations, in combination with other deficits, might contribute to the pathogenesis of AHP.en
dc.language.isoeng
dc.relation.ispartofNeuropsychologia
dc.subjectanosognosia for hemiplegia
dc.subjectmotor representation
dc.subjectmotor imagery
dc.subjectforward model
dc.titleImagining the impossible : motor representations in anosognosia for hemiplegiaen
dc.contributor.institutionDepartment of Psychology
dc.contributor.institutionSchool of Life and Medical Sciences
dc.contributor.institutionHealth & Human Sciences Research Institute
dc.contributor.institutionPsychology
dc.contributor.institutionCognitive Neuropsychology
dc.description.statusPeer reviewed
rioxxterms.versionofrecordhttps://doi.org/10.1016/j.neuropsychologia.2008.10.004
rioxxterms.typeJournal Article/Review
herts.preservation.rarelyaccessedtrue


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