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Visual-spatial processing impairment in the occipital-frontal connectivity network at early stages of Alzheimer's disease

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dc.contributor.authorPlaza, Iván
dc.contributor.authorBrunetti, Enzo
dc.contributor.authorMontefusco, Rodrigo
dc.contributor.authorMadariaga, Samuel
dc.contributor.authorHafelin, Rodrigo
dc.contributor.authorMadariaga, Samuel
dc.contributor.authorPonce, Daniela
dc.contributor.authorBehrens, María
dc.contributor.authorMaldonado, Pedro
dc.contributor.authorLima, Andrea
dc.date.accessioned2024-05-02T21:12:22Z
dc.date.available2024-05-02T21:12:22Z
dc.date.issued2023
dc.description.abstractIntroduction: Alzheimer's disease (AD) is the leading cause of dementia worldwide, but its pathophysiological phenomena are not fully elucidated. Many neurophysiological markers have been suggested to identify early cognitive impairments of AD. However, the diagnosis of this disease remains a challenge for specialists. In the present cross-sectional study, our objective was to evaluate the manifestations and mechanisms underlying visual-spatial deficits at the early stages of AD. Methods: We combined behavioral, electroencephalography (EEG), and eye movement recordings during the performance of a spatial navigation task (a virtual version of the Morris Water Maze adapted to humans). Participants (69-88 years old) with amnesic mild cognitive impairment-Clinical Dementia Rating scale (aMCI-CDR 0.5) were selected as probable early AD (eAD) by a neurologist specialized in dementia. All patients included in this study were evaluated at the CDR 0.5 stage but progressed to probable AD during clinical follow-up. An equal number of matching healthy controls (HCs) were evaluated while performing the navigation task. Data were collected at the Department of Neurology of the Clinical Hospital of the Universidad de Chile and the Department of Neuroscience of the Faculty of Universidad de Chile. Results: Participants with aMCI preceding AD (eAD) showed impaired spatial learning and their visual exploration differed from the control group. eAD group did not clearly prefer regions of interest that could guide solving the task, while controls did. The eAD group showed decreased visual occipital evoked potentials associated with eye fixations, recorded at occipital electrodes. They also showed an alteration of the spatial spread of activity to parietal and frontal regions at the end of the task. The control group presented marked occipital activity in the beta band (15-20 Hz) at early visual processing time. The eAD group showed a reduction in beta band functional connectivity in the prefrontal cortices reflecting poor planning of navigation strategies. Discussion: We found that EEG signals combined with visual-spatial navigation analysis, yielded early and specific features that may underlie the basis for understanding the loss of functional connectivity in AD. Still, our results are clinically promising for early diagnosis required to improve quality of life and decrease healthcare costs.
dc.description.versionPublicada
dc.identifier.citationPlaza-Rosales I, Brunetti E, Montefusco-Siegmund R, Madariaga S, Hafelin R, Ponce DP, Behrens MI, Maldonado PE, Paula-Lima A. Visual-spatial processing impairment in the occipital-frontal connectivity network at early stages of Alzheimer's disease. Front Aging Neurosci. 2023 Feb 9;15:1097577. doi: 10.3389/fnagi.2023.1097577
dc.identifier.doihttps://doi.org/10.3389/fnagi.2023.1097577
dc.identifier.urihttps://hdl.handle.net/11447/8702
dc.language.isoen
dc.subjectAlzheimer’s disease
dc.subjectEEG
dc.subjecteye-tracking
dc.subjectmild cognitive impairment (MCI)
dc.subjectspatial memory
dc.subjectvirtual navigation
dc.titleVisual-spatial processing impairment in the occipital-frontal connectivity network at early stages of Alzheimer's disease
dc.typeArticle
dcterms.accessRightsAcceso abierto
dcterms.sourceFrontiers in aging neuroscience
dspace.entity.typePublication

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