Region-specific changes in prefrontal function with age: a review of PET and fMRI studies on working and episodic memory

被引:391
作者
Rajah, MN
D'Esposito, M
机构
[1] Univ Calif Berkeley, Helen Wills Neurosci Inst, Berkeley, CA 94720 USA
[2] Univ Calif Berkeley, Dept Psychol, Berkeley, CA 94720 USA
基金
美国国家卫生研究院;
关键词
ageing; compensation; dedifferentiation; episodic memory; working memory;
D O I
10.1093/brain/awh608
中图分类号
R74 [神经病学与精神病学];
学科分类号
摘要
Several neuroimaging studies of cognitive ageing have found that age-related deficits in working memory (WM) and episodic memory abilities are related to changes in prefrontal cortex (PFC) function. Reviews of these neuroimaging studies have generally concluded that with age there is a reduction in the hemispheric specialization of cognitive function in the frontal lobes that may either be due to dedifferentiation of function, deficits in function and/or functional reorganization and compensation. Moreover, previous reviews have considered the PFC as homogeneous in function and have not taken into account the possibility that region specific changes in PFC function may occur with age. In the current review we performed a qualitative meta-analytic review of all the functional magnetic resonance imaging ageing studies and positron emission tomography ageing studies of WM and episodic memory that report PFC activation, to determine if any region-specific changes occur. The results indicated that in normal ageing distinct PFC regions exhibit different patterns of functional change, suggesting that age-related changes in PFC function are not homogeneous in nature. Specifically, we hypothesize that normal ageing is related to the differentiation of cortical function in a bilateral ventral PFC and deficits in function in right dorsal and anterior PFC. As a result of these changes, functional compensation in left dorsal and anterior PFC may occur. We hope that future studies will be conducted to either confirm or counter these hypotheses.
引用
收藏
页码:1964 / 1983
页数:20
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