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The specific objective of this proposed research is to understand whether deficits in sleep-dependent memory changes reflect age-related changes in sleep, memory, or both. The central hypothesis is that changes in both memory and sleep contribute to age-related changes in sleep-dependent memory processing. To this end, the investigators will investigate changes in learning following intervals of sleep (overnight and nap) and wake in young and older adults.
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Exp 1: Using neuroimaging, the investigators will consider whether differences in brain areas engaged during memory encoding contribute to age-related changes in sleep-dependent memory consolidation for a word-pair learning task.
Exp 2: The investigators will examine the rate of memory decay between encoding and sleep using two probes of declarative memory (word-pair learning and visuo-spatial learning).
Exp 3: The investigators will provide additional opportunity for encoding of the word-pair and visuo-spatial learning tasks.
Exp 4: Using neuroimaging, the investigators will examine neural engagement during encoding and performance following intervals of sleep and wake.
Exp 5: The investigators will examine the rate of decay of motor sequence learning.
Exp 6: The investigators will examine whether enhanced training ('overtraining') improves sleep-dependent memory consolidation for older adults.
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Additionally, individuals will be excluded from magnetic resonance imaging studies (Exps 1, 4) for:
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584 participants in 2 patient groups
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Data sourced from clinicaltrials.gov
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