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Cited by 92Spatial Neglect and Hemispheric DysfunctionPsychosomatic Disorders and Their TreatmentsHemispheric Asymmetry in Neuroscience

Anosognosia and asomatognosia during intracarotid amobarbital inactivation.

Meador, K.J., Loring, D.W., Feinberg, T.E., Lee, G.P., Nichols, M.E.·2000·Neurology
DOI 10.1212/wnl.55.6.816
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Abstract

BACKGROUND: Anosognosia (i.e., denial of hemiparesis) and asomatognosia (i.e., inability to recognize the affected limb as one's own) occur more frequently with right cerebral lesions. However, the incidence, relative recovery, and underlying mechanisms remain unclear. METHODS: Anosognosia and asomatognosia were examined in 62 patients undergoing the intracarotid amobarbital procedure as part of their preoperative evaluation for epilepsy surgery. Additional questions were asked in the last 32 patients studied. RESULTS: During inactivation of the non-language-dominant cerebral hemisphere, 88% of the 62 patients were unaware of their paralysis, and 82% could not recognize their own hand at some point. Only 3% did not exhibit anosognosia or asomatognosia. In general, asomatognosia resolved earlier than anosognosia. When patients could not recognize their hand, they uniformly thought that it was someone else's hand. Dissociations in awareness were seen in the second series of 32 patients. Although 23 patients (72%) thought that both arms were in the air, 31% pointed to the correct position of the paralyzed arm on the table. Despite the inability of 24 of 32 patients (75%) to recognize their own hand, 21% of these patients were aware that their arm was weak, and 38% had correctly located their paralyzed arm on the angiography table. CONCLUSIONS: Anosognosia and asomatognosia are both common during acute dysfunction of the non-language-dominant cerebral hemisphere. Dissociations of perception of location, weakness, and ownership of the affected limb are frequent, as are misperceptions of location and body part identity. The dissociations suggest that multiple mechanisms are involved.

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  • People with pathological conditions affecting frontal and parietal lobes can sometimes fail to recognise their limbs as belonging to themselves.

    “From neurology we know that these functions can break down as people with pathological conditions affecting frontal and parietal lobes can sometimes fail to recognise their limbs as belonging to themselves [12], [13], [14].”

    From If I were you: Perceptual illusion of body swapping (2008) · cites this paper as [14]

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Authors
Meador, K. J., Loring, D. W., Feinberg, T. E., Lee, G. P., & Nichols, M. E.
Affiliations
Mount Sinai Beth Israel (US)
ORCID
Venue
Neurology
Publisher
Ovid Technologies (Wolters Kluwer Health)
Published
2000-09-26
Volume
55
Issue
6
Pages
816-820
ISSN
  • 0028-3878 (ISSN-L)
  • 1526-632X
DOI
10.1212/wnl.55.6.816
OpenAlex
W1978495002
Cited by
92
References
27
Citations by year
2026: 1 · 2024: 2 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 1 · 2019: 5 · 2018: 2 · 2017: 1 · 2016: 3 · 2015: 3 · 2014: 3 · 2013: 3 · 2012: 1
FWCI
1.88
Type
journal article
Language
en
Open access
closed
Locations
  • Neurology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Spatial Neglect and Hemispheric Dysfunction
  • Health Sciences › Medicine › Psychiatry and Mental health › Psychosomatic Disorders and Their Treatments
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Hemispheric Asymmetry in Neuroscience
Keywords
anosognosia, asomatognosia, hemispatial neglect, right hemisphere damage, hemiparesis, body ownership, epilepsy surgery, preoperative assessment
MeSH terms
Adolescent, Adult, Agnosia, Amobarbital, Awareness, Denial, Psychological, Epilepsy, Female, Humans, Functional Laterality, Male, Middle Aged

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