Previous authors reported evidence for intact implicit memories (those retrieved without conscious effort) in a serial reaction time task for both Alzheimer's subjects and age-matched controls, although performance on an explicit memory task (requiring conscious effort for retrieval) was poor. The current study assessed latencies on a puzzle-assembly task to assess implicit (procedural) memory for 23 female volunteers. Nine participants suffered from probable Alzheimer's Disease and fourteen did not. Even when subjects had no explicit memory of practicing the task, they demonstrated savings upon relearning. Implications for research on memory dissociations in Alzheimer's Disease are discussed.
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References
1.
KnopmanD. S., & NissenM. J. (1987) Implicit learning in patients with probable Alzheimer's disease. Neurology, 37, 784–788.
2.
KnowltonB. J.MangelsJ. A., & SquireL. R. (1996) A neostriatal habit learning system in humans. Science, 273, 1399–1402.
3.
PerruchetP., & GallegoJ. (1993) Association between conscious knowledge and performance in normal subjects: reply to Cohen and Curran (1993) and Willingham, Greeley, and Bardone (1993). Journal of Experimental Psychology: Learning, Memory, & Cognition, 19, 1438–1444.
4.
ReberA. S. (1995). Implicit learning and tacit knowledge.New York: Oxford Univer. Press.
5.
ReisbergB.FerrisS. H.De LeonM. J., & CrookT. (1982) The Global Deterioration Scale for assessment of primary degenerative dementia. American Journal of Psychiatry, 139, 121–124.
6.
SchacterD. L. (1987) Implicit memory, history and current status. Journal of Experimental Psychology: Learning, Memory, and Cognition, 13, 501–518.
7.
SchacterD. L. (1992) Understanding implicit memory: a cognitive neuroscience approach. American Psychologist, 47, 559–569.
8.
SchacterD. L., & TulvingE. (1994) What are the memory systems of 1994? In SchacterD. L., & TulvingE. (Eds.), Memory Systems 1994.Cambridge, MA: MIT Press. Pp. 1–38.
