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Detection of prospective memory deficits in mild cognitive impairment of suspected Alzheimer’s disease etiology using a novel event-based prospective memory task

Published online by Cambridge University Press:  01 January 2009

ALBERTO BLANCO-CAMPAL*
Affiliation:
School of Psychology, University College Dublin, Dublin, Ireland North Eastern Area of the Health Service Executive, Dundalk, Ireland
ROBERT F. COEN
Affiliation:
Mercer’s Institute for Research on Ageing, St James’s Hospital, Dublin, Ireland
BRIAN A. LAWLOR
Affiliation:
Mercer’s Institute for Research on Ageing, St James’s Hospital, Dublin, Ireland
JOSEPH B. WALSH
Affiliation:
Mercer’s Institute for Research on Ageing, St James’s Hospital, Dublin, Ireland
TERESA E. BURKE
Affiliation:
School of Psychology, University College Dublin, Dublin, Ireland
*
*Correspondence and reprint requests to: Alberto Blanco-Campal, School of Psychology, University College Dublin, Belfield, Dublin 4, Ireland. E-mail: Alberto.Blanco-Campal@hse.ie

Abstract

We investigated the relative discriminatory efficacy of an event-based prospective memory (PM) task, in which specificity of the instructions and perceptual salience of the PM cue were manipulated, compared with two widely used retrospective memory (RM) tests (Rivermead Paragraph Recall Test and CERAD-Word List Test), when detecting mild cognitive impairment of suspected Alzheimer’s disease etiology (MCI-AD) (N = 19) from normal controls (NC) (N = 21). Statistical analyses showed high discriminatory capacity of the PM task for detecting MCI-AD. The Non-Specific-Non-Salient condition proved particularly useful in detecting MCI-AD, possibly reflecting the difficulty of the task, requiring more strategic attentional resources to monitor for the PM cue. With a cutoff score of <4/10, the Non-Specific-Non-Salient condition achieved a sensitivity = 84%, and a specificity = 95%, superior to the most discriminative RM test used (CERAD-Total Learning: sensitivity = 83%; specificity = 76%). Results suggest that PM is an early sign of memory failure in MCI-AD and may be a more pronounced deficit than retrospective failure, probably reflecting the greater self-initiated retrieval demands involved in the PM task used. Limitations include the relatively small sample size, and the use of a convenience sample (i.e. memory clinic attenders and healthy active volunteers), reducing the generalizability of the results, which should be regarded as preliminary. (JINS, 2009, 15, 154–159.)

Type
Brief Communications
Copyright
Copyright © INS 2009

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