Journal
ARCHIVES OF CLINICAL NEUROPSYCHOLOGY
Volume 22, Issue 1, Pages 15-24Publisher
OXFORD UNIV PRESS
DOI: 10.1016/j.acn.2006.08.013
Keywords
practice effects; cognitive outcome; mild cognitive impairment; HIV; Huntington's disease
Categories
Funding
- NATIONAL INSTITUTE OF MENTAL HEALTH [R21MH061801, R01MH048639, K02MH001579] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE OF NEUROLOGICAL DISORDERS AND STROKE [R01NS040068] Funding Source: NIH RePORTER
- NATIONAL INSTITUTE ON AGING [R03AG025850] Funding Source: NIH RePORTER
- NIA NIH HHS [R03 AG025850] Funding Source: Medline
- NIMH NIH HHS [R21 MH061801, MH01579, MH48639, MH61801] Funding Source: Medline
- NINDS NIH HHS [NS440068, R01 NS040068] Funding Source: Medline
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Practice effects, defined as improvements in cognitive test performance due to repeated exposure to the test materials, have traditionally been viewed as sources of error. However, they might provide useful information for predicting cognitive outcome. The current study used three separate patient samples (older adults with mild cognitive impairments, individuals who were HIV+, individuals with Huntington's disease) to examine the relationship between practice effects and cognitive functioning at a later point. Across all three samples, practice effects accounted for as much as 31-83% of the variance in the follow-up cognitive scores, after controlling for baseline cognitive functioning. If these findings can be replicated in other patients with neurodegenerative disorders, clinicians and researchers may be able to develop predictive models to identify the individuals who are most likely to demonstrate continued cognitive decline across time. The ability to utilize practice effects data would add a simple, convenient, and non-invasive marker for monitoring an individual patient's cognitive status. Additionally, this prognostic index could be used to offer interventions to patients who are in the earliest stages of progressive neurodegenerative disorders. (c) 2006 National Academy of Neuropsychology. Published by Elsevier Ltd. All rights reserved.
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