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The cognitive neuropsychology of depression in the elderly

Published online by Cambridge University Press:  05 July 2007

LUCIE L. HERRMANN
Affiliation:
Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford OX3 7JX, UK
GUY M. GOODWIN
Affiliation:
Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford OX3 7JX, UK
KLAUS P. EBMEIER*
Affiliation:
Department of Psychiatry, University of Oxford, Warneford Hospital, Oxford OX3 7JX, UK
*
*Address for correspondence: Klaus P. Ebmeier, M.D., Professor of Old Age Psychiatry, University of Oxford, Department of Psychiatry, Warneford Hospital, Oxford OX3 7JX, UK. (Email: klaus.ebmeier@psych.ox.ac.uk)

Abstract

Background

The cognitive impairment of older depressed patients with late- as opposed to early-onset illness may show important differences, in that patients with early onset may suffer predominantly from impaired episodic memory, and those with late onset mainly from reductions of executive function and processing speed.

Method

We searched Medline and EMBASE as well as individual papers' reference lists for relevant publications, recording comparisons in neuropsychological test results between early-onset depression (EOD), late-onset depression (LOD) and healthy volunteers. Effect sizes are presented for cognitive domains, such as executive function, processing speed, episodic memory, semantic memory and mental state examination.

Results

Patients with LOD showed greater reductions in processing speed and executive function than patients with EOD and controls. Both patient groups showed reduced function in all domains, except mental state, compared with controls.

Conclusion

Pronounced executive deficits are typical of the late-onset patients described in published studies, while episodic memory impairment is not specific to early-onset illness. Possible reasons and confounders are discussed.

Type
Review Article
Copyright
Copyright © Cambridge University Press 2007

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