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Dement Geriatr Cogn Disord. 2018;45(1-2):105-120. doi: 10.1159/000486780. Epub 2018 May 3.

Functional Disconnectivity during Inter-Task Resting State in Dementia with Lewy Bodies.

Author information

1
IMIS/Neurocrypto, French National Centre for Scientific Research (CNRS), ICube Laboratory and Fédération de Médecine Translationnelle de Strasbourg (FMTS), University of Strasbourg, Strasbourg, France.
2
Geriatrics Day Hospital and Neuropsychology Unit, Geriatrics Department and Neurology Service, Memory Resources and Research Centre (CMRR), University Hospital of Strasbourg, Strasbourg, France.

Abstract

AIMS:

Limited research has been done on the functional connectivity in visuoperceptual regions in dementia with Lewy bodies (DLB) patients. This study aimed to investigate the functional connectivity differences between a task condition and an inter-task resting state condition within a visuoperceptual paradigm, in DLB patients compared with Alzheimer disease (AD) patients and healthy elderly control subjects.

METHODS:

Twenty-six DLB, 29 AD, and 22 healthy subjects underwent a detailed clinical and neuropsychological examination along with a functional MRI during the different conditions of a visuoperceptual paradigm. Functional images were analyzed using group-level spatial independent component analysis and seed-based connectivity analyses.

RESULTS:

While the DLB patients scored well and did not differ from the control and AD groups in terms of functional activity and connectivity during the task conditions, they showed decreased functional connectivity in visuoperceptual regions during the resting state condition, along with a temporal impairment of the default-mode network activity. Functional connectivity disturbances were also found within two attentional-executive networks and between these networks and visuoperceptual regions.

CONCLUSION:

We found a specific functional profile in the switching between task and resting state conditions in DLB patients. This result could help better characterize functional impairments in DLB and their contribution to several core symptoms of this pathology such as visual hallucinations and cognitive fluctuations.

KEYWORDS:

Dementia with Lewy bodies; Functional MRI; Independent component analysis; Visuoperception

PMID:
29723870
DOI:
10.1159/000486780
[Indexed for MEDLINE]

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