Journal
CLINICAL NEUROPHYSIOLOGY
Volume 130, Issue 9, Pages 1581-1595Publisher
ELSEVIER IRELAND LTD
DOI: 10.1016/j.clinph.2019.05.027
Keywords
Alzheimer's Disease; Dementia; Electroencephalography; Cognitive impairment
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Funding
- EPSRC [EP/P021417/1, EP/N014391/1]
- Wellcome Trust [WT105618MA]
- Alzheimers Society
- Garfield Weston Foundation [231]
- University of Bristol
- EPSRC [EP/N014391/1, EP/P021417/1] Funding Source: UKRI
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Objectives: Functional and structural disconnection of the brain is a prevailing hypothesis to explain cognitive impairment in Alzheimer's Disease (AD). We aim to understand the link between alterations to networks and cognitive impairment using functional connectivity analysis and modelling. Methods: EEG was recorded from 21 AD patients and 26 controls, mapped into source space using eLORETA, and functional connectivity was calculated using phase locking factor. The mini-mental state exam (MMSE) was used to assess cognitive impairment. A computational model was used to uncover mechanisms of altered functional connectivity. Results: Small-worldness (SW) of functional networks decreased in AD and was positively correlated with MMSE score and the language sub-score. Reduced SW was a result of increased path lengths, predominantly localized to the temporal lobes. Combining observed differences in local oscillation frequency with reduced temporal lobe effective connectivity in the model could account for observed functional network differences. Conclusions: Temporal lobe disconnection plays a key role in cognitive impairment in AD. Significance: We combine electrophysiology, neuropsychological scores, and computational modelling to provide novel insight into the relationships between the disconnection hypothesis and cognitive decline in AD. (C) 2019 International Federation of Clinical Neurophysiology. Published by Elsevier B.V.
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