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• W3157292010 abstract "Abstract Individuals with posttraumatic stress disorder (PTSD) are at increased risk for the development of various forms of dementia. Nevertheless, the neuropathological link between PTSD and neurodegeneration remains unclear. Degeneration of the human basal forebrain constitutes a pathological hallmark of neurodegenerative diseases, such as Alzheimer's and Parkinson's disease. In this seed‐based resting‐state (rs‐)fMRI study identifying as outcome measure the temporal BOLD signal fluctuation magnitude, a seed‐to‐voxel analyses assessed temporal correlations between the average BOLD signal within a bilateral whole basal forebrain region‐of‐interest and each whole‐brain voxel among individuals with PTSD ( n = 65), its dissociative subtype (PTSD+DS) ( n = 38) and healthy controls ( n = 46). We found that compared both with the PTSD and healthy controls groups, the PTSD+DS group exhibited increased BOLD signal variability within two nuclei of the seed region, specifically in its extended amygdaloid region: the nucleus accumbens and the sublenticular extended amygdala. This finding is provocative, because it mimics staging models of neurodegenerative diseases reporting allocation of neuropathology in early disease stages circumscribed to the basal forebrain. Here, underlying candidate etiopathogenetic mechanisms are neurovascular uncoupling, decreased connectivity in local‐ and large‐scale neural networks, or disrupted mesolimbic dopaminergic circuitry, acting indirectly upon the basal forebrain cholinergic pathways. These abnormalities may underpin reward‐related deficits representing a putative link between persistent traumatic memory in PTSD and anterograde memory deficits in neurodegeneration. Observed alterations of the basal forebrain in the dissociative subtype of PTSD point towards the urgent need for further exploration of this region as a potential candidate vulnerability mechanism for neurodegeneration in PTSD." @default.
• W3157292010 created "2021-05-10" @default.
• W3157292010 creator A5012499268 @default.
• W3157292010 creator A5051255489 @default.
• W3157292010 creator A5069979654 @default.
• W3157292010 creator A5070535489 @default.
• W3157292010 creator A5091781989 @default.
• W3157292010 date "2021-05-07" @default.
• W3157292010 modified "2023-10-17" @default.
• W3157292010 title "Altered basal forebrain BOLD signal variability at rest in posttraumatic stress disorder: A potential candidate vulnerability mechanism for neurodegeneration in PTSD" @default.
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