Frontal white matter volume and delta EEG sources negatively correlate in awake subjects with mild cognitive impairment and Alzheimer's disease

Claudio Babiloni, Giovanni Frisoni, Mircea Steriade, Lorena Bresciani, Giuliano Binetti, Claudio Del Percio, Cristina Geroldi, Carlo Miniussi, Flavio Nobili, Guido Rodriguez, Filippo Zappasodi, Tania Carfagna, Paolo M. Rossini

Research output: Contribution to journalArticle

Abstract

Objective: A relationship between brain atrophy and delta rhythmicity (1.5-4 Hz) has been previously explored in Alzheimer's disease (AD) subjects [Fernandez A, Arrazola J, Maestu F, Amo C, Gil-Gregorio P, Wienbruch C, Ortiz T. Correlations of hippocampal atrophy and focal low-frequency magnetic activity in Alzheimer disease: volumetric MR imaging-magnetoencephalographic study. Am J Neuroradiol. 2003 24(3):481-487]. In this study, we tested the hypothesis that such a relationship does exist not only in AD patients but also across the continuum of subjects with mild cognitive impairment (MCI) and AD. Methods: Resting, eyes-closed EEG data were recorded in 34 MCI and 65 AD subjects. EEG rhythms of interest were delta (2-4 Hz), theta (4-8 Hz), alpha 1 (8-10.5 Hz), alpha 2 (10.5-13 Hz), beta 1 (13-20 Hz), and beta 2 (20-30 Hz). EEG cortical sources were estimated by LORETA. Cortical EEG sources were correlated with MR-based measurements of lobar brain volume (white and gray matter). Results: A negative correlation was observed between the frontal white matter and the amplitude of frontal delta sources (2-4 Hz) across MCI and AD subjects. Conclusions: These results confirmed for the first time the hypothesis that the sources of resting delta rhythms (2-4 Hz) are correlated with lobar brain volume across MCI and AD subjects. Significance: The present findings support, at least at group level, the 'transition hypothesis' of brain structural and functional continuity between MCI and AD.

Original languageEnglish
Pages (from-to)1113-1129
Number of pages17
JournalClinical Neurophysiology
Volume117
Issue number5
DOIs
Publication statusPublished - May 2006

Keywords

  • Alzheimer's disease (AD)
  • Electroencephalography (EEG)
  • Low resolution brain electromagnetic tomography (LORETA)
  • Magnetic resonance imaging (MRI)
  • Mild cognitive impairment (MCI)

ASJC Scopus subject areas

  • Clinical Neurology
  • Radiology Nuclear Medicine and imaging
  • Neurology
  • Sensory Systems
  • Physiology (medical)

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