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Author Notes:

Susanne G. Mueller, Department of Veterans Affairs (DVA) Medical Center, Center for Imaging of Neurodegenerative Diseases, Clement Street 4150, San Francisco, CA 94121, USA. susanne.mueller@ucsf.edu.

Subjects:

Research Funding:

National Institutes of Health; Contract grant number: RO1-NS31966.

Keywords:

  • Science & Technology
  • Life Sciences & Biomedicine
  • Neurosciences
  • Neuroimaging
  • Radiology, Nuclear Medicine & Medical Imaging
  • Neurosciences & Neurology
  • TLE
  • CA1
  • CA3
  • dentate gyrus
  • MRI
  • recognition
  • recall
  • mesial temporal sclerosis
  • fusiform
  • HIGH-RESOLUTION MRI
  • RECOGNITION MEMORY
  • FUNCTIONAL NEUROANATOMY
  • HIPPOCAMPAL SCLEROSIS
  • EPISODIC MEMORY
  • PREFRONTAL CORTEX
  • NMDA RECEPTORS
  • SPATIAL MEMORY
  • DENTATE GYRUS

Different structural correlates for verbal memory impairment in temporal lobe epilepsy with and without mesial temporal lobe sclerosis

Tools:

Journal Title:

Human Brain Mapping

Volume:

Volume 33, Number 2

Publisher:

, Pages 489-499

Type of Work:

Article | Post-print: After Peer Review

Abstract:

Objectives: Memory impairment is one of the most prominent cognitive deficits in temporal lobe epilepsy (TLE). The overall goal of this study was to explore the contribution of cortical and hippocampal (subfield) damage to impairment of auditory immediate recall (AIMrecall), auditory delayed recall (ADMrecall), and auditory delayed recognition (ADMrecog) of the Wechsler Memory Scale III (WMS-III) in TLE with (TLE-MTS) and without hippocampal sclerosis (TLE-no). It was hypothesized that volume loss in different subfields determines memory impairment in TLE-MTS and temporal neocortical thinning in TLE-no. Methods: T1 whole brain and T2-weighted hippocampal magnetic resonance imaging and WMS-III were acquired in 22 controls, 18 TLE-MTS, and 25 TLE-no. Hippocampal subfields were determined on the T2 image. Free surfer was used to obtain cortical thickness averages of temporal, frontal, and parietal cortical regions of interest (ROI). MANOVA and stepwise regression analysis were used to identify hippocampal subfields and cortical ROI significantly contributing to AIMrecall, ADMrecall, and ADMrecog. Results: In TLE-MTS, AIMrecall was associated with cornu ammonis 3 (CA3) and dentate (CA3&DG) and pars opercularis, ADMrecall with CA1 and pars triangularis, and ADMrecog with CA1. In TLE-no, AIMrecall was associated with CA3&DG and fusiform gyrus (FUSI), and ADMrecall and ADMrecog were associated with FUSI. Conclusion: The study provided the evidence for different structural correlates of the verbal memory impairment in TLE-MTS and TLE-no. In TLE-MTS, the memory impairment was mainly associated by subfield-specific hippocampal and inferior frontal cortical damage. In TLE-no, the impairment was associated by mesial-temporal cortical and to a lesser degree hippocampal damage.

Copyright information:

© 2011 Wiley Periodicals, Inc.

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