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Abnormalities of resting-state functional cortical connectivity in patients with dementia due to Alzheimer's and Lewy body diseases: an EEG study

Babiloni, Claudio
Del Percio, Claudio
Lizio, Roberta
Noce, Giuseppe
Lopez, Susanna
Soricelli, Andrea
Ferri, Raffaele
Nobili, Flavio
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Published in Neurobiology of Aging. 2018, vol. 65, p. 18-40
Abstract Previous evidence showed abnormal posterior sources of resting-state delta (<4 Hz) and alpha (8-12 Hz) rhythms in patients with Alzheimer's disease with dementia (ADD), Parkinson's disease with dementia (PDD), and Lewy body dementia (DLB), as cortical neural synchronization markers in quiet wakefulness. Here, we tested the hypothesis of additional abnormalities in functional cortical connectivity computed in those sources, in ADD, considered as a "disconnection cortical syndrome", in comparison with PDD and DLB. Resting-state eyes-closed electroencephalographic (rsEEG) rhythms had been collected in 42 ADD, 42 PDD, 34 DLB, and 40 normal healthy older (Nold) participants. Exact low-resolution brain electromagnetic tomography (eLORETA) freeware estimated the functional lagged linear connectivity (LLC) from rsEEG cortical sources in delta, theta, alpha, beta, and gamma bands. The area under receiver operating characteristic (AUROC) curve indexed the classification accuracy between Nold and diseased individuals (only values >0.7 were considered). Interhemispheric and intrahemispheric LLCs in widespread delta sources were abnormally higher in the ADD group and, unexpectedly, normal in DLB and PDD groups. Intrahemispheric LLC was reduced in widespread alpha sources dramatically in ADD, markedly in DLB, and moderately in PDD group. Furthermore, the interhemispheric LLC in widespread alpha sources showed lower values in ADD and DLB than PDD groups. At the individual level, AUROC curves of LLC in alpha sources exhibited better classification accuracies for the discrimination of ADD versus Nold individuals (0.84) than for DLB versus Nold participants (0.78) and PDD versus Nold participants (0.75). Functional cortical connectivity markers in delta and alpha sources suggest a more compromised neurophysiological reserve in ADD than DLB, at both group and individual levels.
Keywords AgedAlzheimer Disease/complicationsCerebral Cortex/diagnostic imaging/physiologyCognition/physiologyCortical Synchronization/physiologyDementia/diagnosis/etiology/physiopathology/psychologyElectroencephalographyFemaleHumansLewy Body Disease/complicationsMaleRest/physiology
PMID: 29407464
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Research group Troubles de mémoire et maladie d'Alzeimer (935)
Directorate for Mathematical & Physical Sciences: 0721281
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BABILONI, Claudio et al. Abnormalities of resting-state functional cortical connectivity in patients with dementia due to Alzheimer's and Lewy body diseases: an EEG study. In: Neurobiology of Aging, 2018, vol. 65, p. 18-40. doi: 10.1016/j.neurobiolaging.2017.12.023 https://archive-ouverte.unige.ch/unige:124472

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Deposited on : 2019-10-16

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