[Awareness of memory deficits in patients with probable Alzheimer's disease]

Thirty-eight patients with Alzheimer's disease were asked to give a qualitative (estimation of memory changes) and quantitative assessment of their own performance on memory tasks and also of their relatives' performance. Qualitative assessment showed to be independent from measured memory-deficits, while the precision of quantitative prediction of performance deteriorated with increased cognitive impairment. Cognitive impairment of the demented patients did not influence the prediction of the performance of their relatives. Both, qualitative and quantitative assessment of memory performance were influenced by premorbid coping-strategies. Patients, who were attributed to use strategies of cognitive avoidance, more often claimed to have no changes in memory function or over-estimated their memory performance. The results of this investigation reveal that methodological issues influence studies on the association of meta-cognitive abilities with the severity of dementia to a great extent. They also suggest that awareness of deficits should be based on a complex, multi-dimensional concept.