[en] Alzheimer's disease (AD) is a degenerative dementia characterized by different aspects of impaired consciousness. For example, there is a deficit of controlled processes that require conscious processing of information. Such an impairment is indexed by decreased performances at controlled cognitive tasks, and it is related to reduced brain metabolic activity in a network of frontal, posterior associative, and limbic regions. Another aspect of impaired consciousness is that AD patients show variable levels of anosognosia concerning their cognitive deficits. A discrepancy score between patient's and caregiver's assessment of cognitive functions is one of the most frequently used measures of anosognosia. A high discrepancy score has been related to impaired activity in the superior frontal sulcus and the parietal cortex in AD. Anosognosia for cognitive deficits in AD could be partly explained by impaired metabolism in parts of networks subserving self-referential processes (e.g., the superior frontal sulcus) and perspective-taking (e.g., the temporoparietal junction). We hypothesize that these patients are impaired in the ability to see themselves with a third-person perspective (i.e., being able to see themselves as other people see them).
Disciplines :
Neurology
Author, co-author :
Salmon, Eric ; Université de Liège - ULiège > Département des sciences cliniques > Neuroimagerie des troubles de la mémoire et révalid. cogn.
Ruby, Perrine
Perani, Daniela; Vita-Salute San Raffaele University
Kalbe, Elke; Max-Planck Institute for Neurological Research (Cologne)
Laureys, Steven ; Université de Liège - ULiège > Centre de recherches du cyclotron
Adam, Stéphane ; Université de Liège - ULiège > Département des sciences cognitives > Département des sciences cognitives
Collette, Fabienne ; Université de Liège - ULiège > Département des sciences cognitives > Neuropsychologie
Language :
English
Title :
Two Aspects of Impaired Consciousness in Alzheimer's Disease
Publication date :
2005
Journal title :
Progress in Brain Research
ISSN :
0079-6123
eISSN :
1875-7855
Publisher :
Elsevier Science Bv
Volume :
150
Issue :
Boundaries of Consciousness: Neurobiology and Neuropathology
Pages :
287-98
Peer reviewed :
Peer Reviewed verified by ORBi
Funders :
F.R.S.-FNRS - Fonds de la Recherche Scientifique [BE] FMRE - Fondation Médicale Reine Elisabeth [BE] NEST-DD InterUniversity Attraction Pole 5/04
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