fMRI resting state networks and their association with cognitive fluctuations in dementia with Lewy bodies

NeuroImage: Clinical

Laura Bonanni¹  Marco Onofrj¹  John O'Brien²  Luis R. Peraza³  Sara Graziadio³  Sean J. Colloby³  John-Paul Taylor⁴  Michael Firbank⁴  Andrew Blamire⁵  Marcus Kaiser⁶ 

[1] Department of Neuroscience and Imaging, “G. d'Annunzio” University, Chieti, Italy;Department of Psychiatry, University of Cambridge, Addenbrooke's Hospital, Cambridge CB2 0QC, UK;Institute for Ageing and Health, Newcastle University, Campus for Ageing and Vitality, Newcastle upon Tyne NE4 5PL, UK;Institute for Ageing and Health, Newcastle University, Wolfson Research Centre, Campus for Ageing and Vitality, Newcastle upon Tyne NE4 5PL, UK;Newcastle Magnetic Resonance Centre, Campus for Ageing and Vitality, Newcastle upon Tyne NE4 5PL, UK;School of Computing Science, Newcastle University, Newcastle upon Tyne NE4 5PL, UK;

关键词: Cognitive fluctuations;    Visual hallucinations;    Resting state network;    Lewy bodies;    Dementia;   

DOI  :  10.1016/j.nicl.2014.03.013

来源: DOAJ

【 摘 要 】

Cognitive fluctuations are a core symptom in dementia with Lewy bodies (DLB) and may relate to pathological alterations in distributed brain networks. To test this we analysed resting state fMRI changes in a cohort of fluctuating DLB patients (n = 16) compared with age matched controls (n = 17) with the aim of finding functional connectivity (FC) differences between these two groups and whether these associate with cognitive fluctuations in DLB. Resting state networks (RSNs) were estimated using independent component analysis and FC between the RSN maps and the entirety of the brain was assessed using dual regression. The default mode network (DMN) appeared unaffected in DLB compared to controls but significant cluster differences between DLB and controls were found for the left fronto-parietal, temporal, and sensory–motor networks. Desynchronization of a number of cortical and subcortical areas related to the left fronto-parietal network was associated with the severity and frequency of cognitive fluctuations. Our findings provide empirical evidence for the potential role of attention–executive networks in the aetiology of this core symptom in DLB.

【 授权许可】

Unknown