Memory. 1999 Sep-Nov;7(5-6):715-32.

The hippocampus and delayed recall: bigger is not necessarily better?

Foster JK, Meikle A, Goodson G, Mayes AR, Howard M, Sünram SI, Cezayirli E, Roberts N.

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Department of Psychology, University of Manchester, UK. foster@psy.man.ac.uk

Abstract

Healthy young female participants were tested on a measure of delayed verbal recall and then received volumetric Magnetic Resonance Imaging (MRI) scans. The analysis of the MRI scans focused on the volume of the hippocampus. Left hippocampal volume was negatively associated with the level of delayed verbal recall performance. This relationship was confirmed in further testing. This finding is consistent with a previous report of a similar relationship in healthy elderly individuals, but not in patients with Alzheimer's disease, in whom the opposite relationship was observed. An explanation of these findings in terms of impaired neural pruning of the hippocampus is advanced, whereby insufficient pruning of the hippocampus during childhood and adolescence (following adequate growth) may lead to reduced mnemonic efficiency.

PMID:: 10659094; [PubMed - indexed for MEDLINE]

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