Friday, November 04, 2011

Computerized Cognitive Testing: A New CogState Paper

Reliability of repeated cognitive assessment of dementia using a brief computerized battery
American Journal of Alzheimers Disease and Other Dementias. 2011 Jun; 26(4): 326-333.
Hammers D, Spurgeon E, Ryan K, Persad C, Heidebrink J, Barbas N, Albin R, Frey K, Darby D, Giordani B


OBJECTIVE: The aim of this study was to evaluate the short-term stability and reliability of a brief computerized cognitive battery in established dementia types.
METHOD: Patients were administered the computerized battery twice with administrations approximately 2 hours apart, with intervening conventional neuropsychological tests. Patients were classified clinically, via consensus conference, as healthy controls (n = 23), mild cognitive impairment (n = 20), Alzheimer's disease (n = 52), dementia with Lewy Bodies ([DLB], n = 10), or frontotemporal dementia (n = 9).
RESULTS: Minimal practice effects were evident across Cog-State test administrations. Small magnitude improvements were seen across all groups on a working memory task, and healthy controls showed a mild practice effect on the accuracy of associative learning.
CONCLUSIONS: In established dementia, administration of the CogState tasks appears sensitive to cognitive impairment in dementia. Repeat administration also provided acceptable stability and test-retest reliability with minimal practice effects at short test-retest intervals despite intervening cognitive challenges.

PMID: 21636581 [PubMed - indexed for MEDLINE]

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