Benefits of Immediate Repetition Versus Long Study Presentation On
Neuropsychology In the public domain 2010, Vol. 24, No. 4, 457–464 DOI: 10.1037/a0018625 Benefits of Immediate Repetition Versus Long Study Presentation on Memory in Amnesia Mieke Verfaellie and Karen F. LaRocque Suparna Rajaram Memory Disorders Research Center, VA Boston Healthcare Stony Brook University System, and Boston University School of Medicine Objective: This study aimed to resolve discrepant findings in the literature regarding the effects of massed repetition and a single long study presentation on memory in amnesia. Method: Experiment 1 assessed recognition memory in 9 amnesic patients and 18 controls following presentation of a study list that contained items shown for a single short study presentation, a single long study presentation, and three massed repetitions. In Experiment 2, the same encoding conditions were presented in a blocked rather than intermixed format to all participants from Experiment 1. Results: In Experiment 1, control participants showed benefits associated with both types of extended exposure, and massed repetition was more beneficial than long study presentation, F(2, 34) ϭ 14.03, p Ͻ .001, partial 2 ϭ .45. In contrast, amnesic participants failed to show benefits of either type of extended exposure, F Ͻ 1. In Experiment 2, both groups benefited from repetition, but did so in different ways, F(2, 50) ϭ 4.80, p ϭ .012, partial 2 ϭ .16. Amnesic patients showed significant and equivalent benefit associated with both types of extended exposure, F(2, 16) ϭ 5.58, p ϭ .015, partial 2 ϭ .41, but control participants again benefited more from massed repetition than from long study presentation, F(2, 34) ϭ 23.74, p Ͻ .001, partial 2 ϭ .58.
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