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Brain Cogn. 2004 Apr;54(3):212-4.

Cognitive slowing and learning of target detection skills in pre-demented subjects.

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INSERM U593, Université de Bordeaux II, Bordeaux, France.


Alzheimer's disease produces a generalized slowing of cognitive processing increasing with the progression of dementia. However little is known about this phenomenon in the pre-demented stages. Our purpose was to investigate cognitive slowing in pre-demented subjects and their ability to develop target detection skills while performing a cancellation task. The results on 16 pre-demented subjects and 32 matched controls show that cognitive slowing is already present 3 years before subjects fulfill dementia criteria, at a stage where errors are still not different between pre-demented and control subjects. Additionally, the two groups significantly improved their time performances all along the test suggesting that both groups including the pre-demented group were able to progressively acquire a target detection skill.

[Indexed for MEDLINE]

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