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The alien hand syndrome: What makes the alien hand alien?

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Title: The alien hand syndrome: What makes the alien hand alien?
Authors: Biran, Iftah (AUTHOR), Giovannetti, Tania (AUTHOR), Buxbaum, Laurel (AUTHOR), Chatterjee, Anjan (AUTHOR)
Source: Cognitive Neuropsychology. Jun2006, Vol. 23 Issue 4, p563-582. 20p. 3 Charts, 8 Graphs.
Subjects: Brain damaged patients, Extremities (Anatomy), Corpus callosum, Telencephalon, Ischemia
Abstract: The alien hand syndrome is a deeply puzzling phenomenon in which brain-damaged patients experience their limb performing seemingly purposeful acts without their intention. Furthermore, the limb may interfere with the actions of their normal limb. We report a case of alien hand syndrome following a left medial frontal and corpus callosum ischemic lesion. From our clinical observations and the patient's performances on experimental tasks, we postulate that three factors contribute to the sense of alienness: First, the errant limb must be disinhibited and disproportionately reactive to external environmental stimuli. Second, the limb is under less volitional control and produces perseverative movements in which motor stereotypies are concatenated. Consequently, the disinhibited limb perseverates on external stimuli and appears purposeful, despite not being engaged in true goal-directed intentions. Finally, the patient needs to have a relatively intact action-monitoring system to be aware of the abnormal movements as they are occurring. [ABSTRACT FROM AUTHOR]
Copyright of Cognitive Neuropsychology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Psychology and Behavioral Sciences Collection
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  Data: The alien hand syndrome: What makes the alien hand alien?
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  Data: <searchLink fieldCode="AR" term="%22Biran%2C+Iftah%22">Biran, Iftah</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Giovannetti%2C+Tania%22">Giovannetti, Tania</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Buxbaum%2C+Laurel%22">Buxbaum, Laurel</searchLink> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Chatterjee%2C+Anjan%22">Chatterjee, Anjan</searchLink> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Cognitive+Neuropsychology%22">Cognitive Neuropsychology</searchLink>. Jun2006, Vol. 23 Issue 4, p563-582. 20p. 3 Charts, 8 Graphs.
– Name: Subject
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  Data: <searchLink fieldCode="DE" term="%22Brain+damaged+patients%22">Brain damaged patients</searchLink><br /><searchLink fieldCode="DE" term="%22Extremities+%28Anatomy%29%22">Extremities (Anatomy)</searchLink><br /><searchLink fieldCode="DE" term="%22Corpus+callosum%22">Corpus callosum</searchLink><br /><searchLink fieldCode="DE" term="%22Telencephalon%22">Telencephalon</searchLink><br /><searchLink fieldCode="DE" term="%22Ischemia%22">Ischemia</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: The alien hand syndrome is a deeply puzzling phenomenon in which brain-damaged patients experience their limb performing seemingly purposeful acts without their intention. Furthermore, the limb may interfere with the actions of their normal limb. We report a case of alien hand syndrome following a left medial frontal and corpus callosum ischemic lesion. From our clinical observations and the patient's performances on experimental tasks, we postulate that three factors contribute to the sense of alienness: First, the errant limb must be disinhibited and disproportionately reactive to external environmental stimuli. Second, the limb is under less volitional control and produces perseverative movements in which motor stereotypies are concatenated. Consequently, the disinhibited limb perseverates on external stimuli and appears purposeful, despite not being engaged in true goal-directed intentions. Finally, the patient needs to have a relatively intact action-monitoring system to be aware of the abnormal movements as they are occurring. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Cognitive Neuropsychology is the property of Taylor & Francis Ltd and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1080/02643290500180282
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        Text: English
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        Type: general
      – SubjectFull: Extremities (Anatomy)
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      – SubjectFull: Corpus callosum
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      – SubjectFull: Telencephalon
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              M: 06
              Text: Jun2006
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              Y: 2006
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            – TitleFull: Cognitive Neuropsychology
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