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Brain Advance Access originally published online on July 27, 2005
Brain 2005 128(9):1964-1983; doi:10.1093/brain/awh608
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© The Author (2005). Published by Oxford University Press on behalf of the Guarantors of Brain. All rights reserved. For Permissions, please email: journals.permissions@oupjournals.org

Review Article

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

M. Natasha Rajah and Mark D'Esposito

Helen Wills Neuroscience Institute and Department of Psychology, University of California, Berkeley, CA, USA

Correspondence to: M. N. Rajah, PhD, Helen Wills Neuroscience Institute, 132 Barker Hall MC #3190, University of California, Berkeley, CA 94720-3190, USA E-mail: mnrajah{at}berkeley.edu

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.

Key Words: ageing; compensation; dedifferentiation; episodic memory; working memory

Abbreviations: BA = Brodmann area; EM = episodic memory; MFG = middle frontal gyrus; PFC = prefrontal cortex; WM = working memory

Received February 14, 2005. Revised May 31, 2005. Accepted July 12, 2005.


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