期刊
NEUROBIOLOGY OF AGING
卷 32, 期 12, 页码 -出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.neurobiolaging.2010.04.004
关键词
Dedifferentiation; Aging; fMRI; Implicit; Explicit; Learning; Medial temporal lobes; Striatum; Declarative; Nondeclarative; Memory
资金
- National Institute of Health [AG19731, AG023770, T32 AG000029]
Abundant research finds that in young adults explicit learning (EL) is more dependent on the medial temporal lobes (MTL) whereas implicit learning (IL) is more dependent on the striatum. Using fMRI, we investigated age differences in each task and whether this differentiation is preserved in older adults. Results indicated that, while young recruited the MTL for EL and striatum for IL, both activations were significantly reduced in older adults. Additionally, results indicated that older adults recruited the MTL for IL, and this activation was significantly greater in older compared with young adults. A significant Task x Age interaction was found in both regions-with young preferentially recruiting the MTL for EL and striatum for IL, and older adults showing no preferential recruit for either task. Finally, young adults demonstrated significant negative correlations between activity in the striatum and MTL during both the EL and IL tasks. These correlations were attenuated in older adults. Taken together results support dedifferentiation in aging across memory systems. (C) 2011 Elsevier Inc. All rights reserved.
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