Alzheimer's Disease Progressively Alters the Face-Evoked Visual-Processing Network
| Autor: | Andrea Bozoki, David C. Zhu, Jie Huang, Paul A. Beach |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
0301 basic medicine
Male Postmortem studies genetic structures media_common.quotation_subject Disease Functional networks Visual processing 03 medical and health sciences 0302 clinical medicine Alzheimer Disease medicine Contrast (vision) Humans Association (psychology) media_common Aged Visual Cortex Aged 80 and over Fusiform gyrus business.industry General Neuroscience General Medicine Middle Aged Psychiatry and Mental health Clinical Psychology 030104 developmental biology Visual cortex medicine.anatomical_structure Disease Progression Evoked Potentials Visual Female Geriatrics and Gerontology Nerve Net business Neuroscience Facial Recognition 030217 neurology & neurosurgery Photic Stimulation |
| Zdroj: | Journal of Alzheimer's disease : JAD. 77(3) |
| ISSN: | 1875-8908 |
| Popis: | Background: Postmortem studies of Alzheimer’s disease (AD) brains not only find amyloid-β (Aβ) and neurofibrillary tangles (NFT) in the primary and associative visual cortical areas, but also reveal a temporally successive sequence of AD pathology beginning in higher-order visual association areas, followed by involvement of lower-order visual processing regions with disease progression, and extending to primary visual cortex in late-stage disease. These findings suggest that neuronal loss associated with Aβ and NFT aggregation in these areas may alter not only the local neuronal activation but also visual neural network activity. Objective: Applying a novel method to identify the visual functional network and investigate the association of the network changes with disease progression. Methods: To investigate the effect of AD on the face-evoked visual-processing network, 8 severe AD (SAD) patients, 11 mild/moderate AD (MAD), and 26 healthy senior (HS) controls undertook a task-fMRI study of viewing face photos. Results: For the HS, the identified group-mean visual-processing network in the ventral pathway started from V1 and ended within the fusiform gyrus. In contrast, this network was disrupted and reduced in the AD patients in a disease-severity dependent manner: for the MAD patients, the network was disrupted and reduced mainly in the higher-order visual association areas; for the SAD patients, the network was nearly absent in the higher-order association areas, and disrupted and reduced in the lower-order areas. Conclusion: This finding is consistent with the current canonical view of the temporally successive sequence of AD pathology through visual cortical areas. |
| Databáze: | OpenAIRE |
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