Verbal memory in left temporal lobe epilepsy: evidence for task-related localization.

Abstract:

:We explored the hypothesis that components of verbal memory are subserved by separate temporal lobe structures in patients with temporal lobe structures in patients with temporal lobe epilepsy [correction]. Uptake of 18F-fluorodeoxyglucose (FDG) measured by positron emission tomography, hippocampal volume, and memory for arbitrarily and semantically related verbal paired associates were examined in 27 patients with left temporary lobe epilepsy. Scores from memory tests performed outside the scanner were regressed against normalized resting FDG uptake at each voxel. Significant regression was seen in the left perirhinal cortex (Talaraich coordinates x, y, z: -29, 10, -34; p < 0.05) for arbitrarily related word pairs. For semantically related paired associates, significant regression was present in the left inferior temporal gyrus (x, y, z: -48, -18, -24; p < 0.05). In subsequent analyses, mean FDG uptake within a spherical region of interest centered on the perirhinal peak predicted performance on both tasks. Mean FDG uptake in a region of interest centered on the inferior temporal peak made an additional, independent contribution to memory for semantically related pairs. Hippocampal volumes did not explain any additional variance in memory scores. Our findings indicate that heterogeneity in the left temporal lobe structures mediating verbal memory function, and support the view that the perirhinal cortex is an important mnemonic substrate.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Weintrob DL,Saling MM,Berkovic SF,Berlangieri SU,Reutens DC

doi

10.1002/ana.10133

keywords:

subject

Has Abstract

pub_date

2002-04-01 00:00:00

pages

442-7

issue

4

eissn

0364-5134

issn

1531-8249

pii

10.1002/ana.10133

journal_volume

51

pub_type

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