Attention network dysfunction underlies memory impairment in posterior cortical atrophy
File(s)
Published version
Author(s)
Veldsman, Michele
Zamboni, Giovanna
Butler, Christopher
Ahmed, Samrah
Type
Journal Article
Abstract
Accumulating evidence suggests that memory is impaired in posterior cortical atrophy (PCA), alongside the early and defining visual disorder. The posterior parietal cortex is a key region of pathology in PCA and memory impairment may be the result of dysfunction of parietally dependent network function rather than the medial temporal lobe dependent dysfunction that defines the storage deficits in typical Alzheimer's disease.
We assessed episodic memory performance and network function in16 PCA patients and 19 healthy controls who underwent structural and resting-state functional MRI and neuropsychological testing. Memory was assessed using the Free and Cued Selective Reminding Test (FCSRT), a sensitive test of episodic memory storage and retrieval. We examined correlations between memory performance and functional connectivity in the dorsal attention (DAN) and default mode network (DMN).
Immediate recall on the FCSRT was relatively preserved in PCA patients. Total recall performance was impaired in patients relative to healthy controls and performance benefitted from retrieval cues. In patients only, disrupted connectivity in the DAN, but not the DMN, was associated with total recall.
Memory impairment may arise from disruption to the dorsal attention network, subserved by the dorsal posterior parietal cortex, a key region of pathology in PCA, rather than classic medial temporal lobe memory circuitry.We propose that functional dysconnectivity in attentional circuits underpins memory impairment in PCA.
We assessed episodic memory performance and network function in16 PCA patients and 19 healthy controls who underwent structural and resting-state functional MRI and neuropsychological testing. Memory was assessed using the Free and Cued Selective Reminding Test (FCSRT), a sensitive test of episodic memory storage and retrieval. We examined correlations between memory performance and functional connectivity in the dorsal attention (DAN) and default mode network (DMN).
Immediate recall on the FCSRT was relatively preserved in PCA patients. Total recall performance was impaired in patients relative to healthy controls and performance benefitted from retrieval cues. In patients only, disrupted connectivity in the DAN, but not the DMN, was associated with total recall.
Memory impairment may arise from disruption to the dorsal attention network, subserved by the dorsal posterior parietal cortex, a key region of pathology in PCA, rather than classic medial temporal lobe memory circuitry.We propose that functional dysconnectivity in attentional circuits underpins memory impairment in PCA.
Date Issued
2019-03-13
Date Acceptance
2019-03-10
Citation
NeuroImage: Clinical, 2019, 22, pp.1-8
ISSN
2213-1582
Publisher
Elsevier
Start Page
1
End Page
8
Journal / Book Title
NeuroImage: Clinical
Volume
22
Copyright Statement
© 2019 Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license
(http://creativecommons.org/licenses/BY-NC-ND/4.0/).
(http://creativecommons.org/licenses/BY-NC-ND/4.0/).
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000470123000085&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Life Sciences & Biomedicine
Neuroimaging
Neurosciences & Neurology
Posterior cortical atrophy
Episodic memory
Default mode network
Resting-state
ALZHEIMERS-DISEASE
FUNCTIONAL CONNECTIVITY
FRONTOTEMPORAL DEMENTIA
EPISODIC MEMORY
DEFAULT-MODE
PARIETAL CORTEX
DORSAL
BRAIN
DEFICITS
CRITERIA
Publication Status
Published
Article Number
ARTN 101773
Date Publish Online
2019-03-13