Brain responses to detection of right or left somatic targets are symmetrical in unilateral Parkinson's disease: a case against the concept of "parkinsonian neglect'.
Identifieur interne : 001517 ( PubMed/Curation ); précédent : 001516; suivant : 001518Brain responses to detection of right or left somatic targets are symmetrical in unilateral Parkinson's disease: a case against the concept of "parkinsonian neglect'.
Auteurs : L. García-Larrea [France] ; E. Brousolle ; M F Gravejat ; G. Chazot ; F. MauguièreSource :
- Cortex; a journal devoted to the study of the nervous system and behavior [ 0010-9452 ] ; 1996.
English descriptors
- KwdEn :
- MESH :
- physiology : Evoked Potentials, Functional Laterality, Reaction Time.
- physiopathology : Parkinson Disease.
- Adult, Age Distribution, Aged, Female, Humans, Male, Middle Aged.
Abstract
Signs of attentional dysfunction mimicking spatial neglect have been described both in humans with lateralised Parkinson's Disease (PD) and in animals with MPTP-related hemiparkinsonism. Such deficits have been attributed to dopamine loss in basal ganglia and cortical targets. However, in previous studies the existence of neglect was assumed from behavioural tests which needed a motor output, thus entailing interpretation ambiguities due to effects of directional hypokinesia. We recorded brain event-related potentials (ERPs) evoked by the presentation of target somatic stimuli to the affected and non-affected sides in 44 patients with unilateral or asymmetrical PD. The N2 and P3 ERP components were specifically analysed, since (a) they are triggered selectively by task-relevant, attended sensory stimuli; (b) their latency reflects stimulus evaluation time, independently from the execution of a motor response, and (c) they have proved to be abnormal in hemineglect syndromes due to focal brain lesions. Irrespective of the side (left or right) of motor symptom predominance there were no significant ERP differences to stimulation of the affected and non-affected limbs, nor was there any correlation between ERP latencies and the degree of dopamine-related motor impairment. The P3 latency was abnormally delayed in 23% of the patients, but there was no trend for abnormalities to concentrate on the affected side. This study does not confirm the existence of a significant attentional impairment toward the affected limb in lateralised PD, and suggests that previous clinical evidence of "neglect' behaviour in PD might be linked to directional hypokinesia, thus reflecting intentional, rather than attentional lateralised deficits.
PubMed: 8954246
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Brousolle</name></author><author><name sortKey="Gravejat, M F" sort="Gravejat, M F" uniqKey="Gravejat M" first="M F" last="Gravejat">M F Gravejat</name></author><author><name sortKey="Chazot, G" sort="Chazot, G" uniqKey="Chazot G" first="G" last="Chazot">G. Chazot</name></author><author><name sortKey="Mauguiere, F" sort="Mauguiere, F" uniqKey="Mauguiere F" first="F" last="Mauguière">F. 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Mauguière</name></author></analytic><series><title level="j">Cortex; a journal devoted to the study of the nervous system and behavior</title><idno type="ISSN">0010-9452</idno><imprint><date when="1996" type="published">1996</date></imprint></series></biblStruct></sourceDesc></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>Adult</term><term>Age Distribution</term><term>Aged</term><term>Evoked Potentials (physiology)</term><term>Female</term><term>Functional Laterality (physiology)</term><term>Humans</term><term>Male</term><term>Middle Aged</term><term>Parkinson Disease (physiopathology)</term><term>Reaction Time (physiology)</term></keywords><keywords scheme="MESH" qualifier="physiology" xml:lang="en"><term>Evoked Potentials</term><term>Functional Laterality</term><term>Reaction Time</term></keywords><keywords scheme="MESH" qualifier="physiopathology" xml:lang="en"><term>Parkinson Disease</term></keywords><keywords scheme="MESH" xml:lang="en"><term>Adult</term><term>Age Distribution</term><term>Aged</term><term>Female</term><term>Humans</term><term>Male</term><term>Middle Aged</term></keywords></textClass></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">Signs of attentional dysfunction mimicking spatial neglect have been described both in humans with lateralised Parkinson's Disease (PD) and in animals with MPTP-related hemiparkinsonism. Such deficits have been attributed to dopamine loss in basal ganglia and cortical targets. However, in previous studies the existence of neglect was assumed from behavioural tests which needed a motor output, thus entailing interpretation ambiguities due to effects of directional hypokinesia. We recorded brain event-related potentials (ERPs) evoked by the presentation of target somatic stimuli to the affected and non-affected sides in 44 patients with unilateral or asymmetrical PD. The N2 and P3 ERP components were specifically analysed, since (a) they are triggered selectively by task-relevant, attended sensory stimuli; (b) their latency reflects stimulus evaluation time, independently from the execution of a motor response, and (c) they have proved to be abnormal in hemineglect syndromes due to focal brain lesions. Irrespective of the side (left or right) of motor symptom predominance there were no significant ERP differences to stimulation of the affected and non-affected limbs, nor was there any correlation between ERP latencies and the degree of dopamine-related motor impairment. The P3 latency was abnormally delayed in 23% of the patients, but there was no trend for abnormalities to concentrate on the affected side. This study does not confirm the existence of a significant attentional impairment toward the affected limb in lateralised PD, and suggests that previous clinical evidence of "neglect' behaviour in PD might be linked to directional hypokinesia, thus reflecting intentional, rather than attentional lateralised deficits.</div></front></TEI><pubmed><MedlineCitation Status="MEDLINE" Owner="NLM"><PMID Version="1">8954246</PMID><DateCreated><Year>1997</Year><Month>03</Month><Day>14</Day></DateCreated><DateCompleted><Year>1997</Year><Month>03</Month><Day>14</Day></DateCompleted><DateRevised><Year>2009</Year><Month>11</Month><Day>11</Day></DateRevised><Article PubModel="Print"><Journal><ISSN IssnType="Print">0010-9452</ISSN><JournalIssue CitedMedium="Print"><Volume>32</Volume><Issue>4</Issue><PubDate><Year>1996</Year><Month>Dec</Month></PubDate></JournalIssue><Title>Cortex; a journal devoted to the study of the nervous system and behavior</Title><ISOAbbreviation>Cortex</ISOAbbreviation></Journal><ArticleTitle>Brain responses to detection of right or left somatic targets are symmetrical in unilateral Parkinson's disease: a case against the concept of "parkinsonian neglect'.</ArticleTitle><Pagination><MedlinePgn>679-91</MedlinePgn></Pagination><Abstract><AbstractText>Signs of attentional dysfunction mimicking spatial neglect have been described both in humans with lateralised Parkinson's Disease (PD) and in animals with MPTP-related hemiparkinsonism. Such deficits have been attributed to dopamine loss in basal ganglia and cortical targets. However, in previous studies the existence of neglect was assumed from behavioural tests which needed a motor output, thus entailing interpretation ambiguities due to effects of directional hypokinesia. We recorded brain event-related potentials (ERPs) evoked by the presentation of target somatic stimuli to the affected and non-affected sides in 44 patients with unilateral or asymmetrical PD. The N2 and P3 ERP components were specifically analysed, since (a) they are triggered selectively by task-relevant, attended sensory stimuli; (b) their latency reflects stimulus evaluation time, independently from the execution of a motor response, and (c) they have proved to be abnormal in hemineglect syndromes due to focal brain lesions. Irrespective of the side (left or right) of motor symptom predominance there were no significant ERP differences to stimulation of the affected and non-affected limbs, nor was there any correlation between ERP latencies and the degree of dopamine-related motor impairment. The P3 latency was abnormally delayed in 23% of the patients, but there was no trend for abnormalities to concentrate on the affected side. 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