Progressive impairment on neuropsychological tasks in a longitudinal study of preclinical Alzheimer's disease.
Previous research suggests that patients with Alzheimer's disease exhibit cognitive impairment in the years preceding a clinical diagnosis. Memory impairments are particularly pronounced, but the relative degree to which other cognitive functions are impaired and the speed with which they decline during the preclinical years remains unclear. The authors report a detailed neuropsychological evaluation of 11 patients over the course of 3 years up to and including the 1st year of nonnormal diagnosis. The results suggest that performance falls off rapidly in all areas of cognitive functioning but that abilities thought to be subserved by the medial and lateral temporal lobes (episodic and semantic memory, respectively) appear to be substantially more impaired than those abilities thought to be subserved by the frontal lobes.
Mickes
Laura
L
Department of Psychology, University of California, San Diego, CA 92093-0109, USA. lmickes@ucsd.edu
Wixted
John T
JT
Fennema-Notestine
Christine
C
Galasko
Douglas
D
Bondi
Mark W
MW
Thal
Leon J
LJ
Salmon
David P
DP
D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000150:complications* / Q000175:diagnosis*; D000704:Analysis of Variance; D003072:Cognition Disorders / Q000209:etiology*; D018450:Disease Progression; D005260:Female; D006801:Humans; D008137:Longitudinal Studies; D008297:Male; D008570:Memory, Short-Term / Q000502:physiology; D008609:Mental Status Schedule; D009483:Neuropsychological Tests; D011340:Problem Solving / Q000502:physiology; D011594:Psychometrics / Q000379:methods; D012016:Reference Values; D012660:Semantics