Anarchic hand syndrome: Bimanual coordination and sensitivity to irrelevant information in unimanual reaches

Kritikos, Ada, Breen, Nora and Mattingley, Jason B. (2005) Anarchic hand syndrome: Bimanual coordination and sensitivity to irrelevant information in unimanual reaches. Cognitive Brain Research, 24 3: 634-647. doi:10.1016/j.cogbrainres.2005.03.015

Author Kritikos, Ada
Breen, Nora
Mattingley, Jason B.
Title Anarchic hand syndrome: Bimanual coordination and sensitivity to irrelevant information in unimanual reaches
Journal name Cognitive Brain Research   Check publisher's open access policy
ISSN 0926-6410
Publication date 2005-01-01
Year available 2005
Sub-type Article (original research)
DOI 10.1016/j.cogbrainres.2005.03.015
Open Access Status Not yet assessed
Volume 24
Issue 3
Start page 634
End page 647
Total pages 14
Place of publication Amsterdam, Netherlands
Publisher Elsevier Science
Language eng
Subject 170101 Biological Psychology (Neuropsychology, Psychopharmacology, Physiological Psychology)
170299 Cognitive Science not elsewhere classified
Abstract Anarchic hand syndrome is characterised by unintended but purposeful and autonomous movements of the upper limb and intermanual conflict. Based on predictions of internal models of movement generation, we examined the role of visual cues in unimanual and bimanual movements in a patient with anarchic hand syndrome and in a matched control. In Experiment 1, participants made unimanual movements in a sequential button-pressing task. The cue for the next target in a sequence appeared either prior to (exogenous) or after (endogenous) the initiation of movement. For the patient, performance of the anarchic left hand was selectively impaired in the endogenous condition. In Experiment 2, participants made unimanual movements on a digitising tablet to a target, which appeared either alone or with a distractor. While the presence of a distractor was associated with increased Initiation time in general, the patient's anarchic left hand was particularly vulnerable to disruption by the distractor. The findings of Experiments 1 and 2 indicate excessive reliance on salient environmental stimuli for movement production in anarchic hand syndrome. We conclude that in AHS goal-directed actions of the affected limb are particularly vulnerable to disruption by non-relevant information. Finally, in Experiment 3, participants performed unimanual and mirror-image bimanual movements on a digitising tablet to targets in the left or right hemispace. Coupling of the parameters of the two hands was evident such that, compared with a unimanual baseline, Initiation time of the intact right hand deteriorated while it improved for the anarchic left hand.
Keyword Neural basis of behaviour
Anarchic hand syndrome
Unimanual action
Bimanual coordination
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Excellence in Research Australia (ERA) - Collection
Queensland Brain Institute Publications
ERA 2012 Admin Only
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Citation counts: TR Web of Science Citation Count  Cited 20 times in Thomson Reuters Web of Science Article | Citations
Scopus Citation Count Cited 23 times in Scopus Article | Citations
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Created: Wed, 17 Oct 2007, 23:55:56 EST