Neuropsychiatric Symptoms and Functional Connectivity in Mild Cognitive Impairment

Journal of Alzheimer's Disease : JAD
Catherine E MunroGad A Marshall

Abstract

Neuropsychiatric symptoms (NPS), such as apathy and depression, commonly accompany cognitive and functional decline in early Alzheimer's disease (AD). Prior studies have shown associations between affective NPS and neurodegeneration of medial frontal and inferior temporal regions in mild cognitive impairment (MCI) and AD dementia. To investigate the association between functional connectivity in four brain networks and NPS in elderly with MCI. NPS were assessed using the Neuropsychiatric Inventory in 42 subjects with MCI. Resting-state functional connectivity in four networks (default mode network, fronto-parietal control network (FPCN), dorsal attention network, and ventral attention network) was assessed using seed-based magnetic resonance imaging. Factor analysis was used to identify two factors of NPS: Affective and Hyperactivity. Linear regression models were utilized with the neuropsychiatric factors as the dependent variable and the four networks as the predictors of interest. Covariates included age, gender, premorbid intelligence, processing speed, memory, head movement, and signal-to-noise ratio. These analyses were repeated with the individual items of the affective factor, using the same predictors. There was a sign...Continue Reading

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