We compared fMRI findings (using SPM99) obtained with repetition task in normal subjects with those of two patients with Broca's and Wernicke's aphasia who received speech therapy and showed complete recovery. Both aphasic patients with left hemisphere damage who showed complete recovery exhibited activation of only the compensatory area in the right hemisphere during the repetition task. Recovery from Broca's aphasia involves reorganization and neuromodulation between the external temporopolar area and the anterior superior temporal area of the superior temporal gyrus, putamen and the inferior frontal gyrus, while that from Wernicke's aphasia involves reorganization and neuromodulation between the superior temporal gyrus of the temporal region, the posterior supramarginal gyrus and inferior parietal lobule of the parietal region.
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http://dx.doi.org/10.1097/00001756-200408260-00011 | DOI Listing |
Sci Rep
January 2025
Department of Ophthalmology, School of Medicine, University of Pittsburgh, Pittsburgh, PA, USA.
To assess the choroidal vessels in healthy eyes using a novel three-dimensional (3D) deep learning approach. In this cross-sectional retrospective study, swept-source OCT 6 × 6 mm scans on Plex Elite 9000 device were obtained. Automated segmentation of the choroidal layer was achieved using a deep-learning ResUNet model along with a volumetric smoothing approach.
View Article and Find Full Text PDFBackground: Alzheimer's disease (AD) is a devastating neurodegenerative disorder with few therapies to treat, mitigate or prevent its onset. Understanding of this disease is predominantly based on research in non-Hispanic Whites (NHW) although AD disproportionately affects African Americans (AA) and Latin Americans (LA), underrepresented in AD research. To address this knowledge gap, the Accelerating Medicine Partnership for Alzheimer's Disease (AMP-AD) Diversity Working Group was launched to generate multi-omics data from post-mortem brain tissue from donors of predominantly AA and LA descent.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Mass General Institute for Neurodegenerative Disease, Charlestown, MA, USA.
Background: Some individuals can tolerate the presence of Alzheimer disease neuropathologic changes (ADNC) (e.g., plaques and tangles) without developing dementia.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Yale School of Medicine, New Haven, CT, USA.
Background: While the apolipoprotein E (APOE) ε4 allele is a well-known risk factor for late-onset Alzheimer's disease (LOAD), not all carriers develop the condition, suggesting the presence of resilience and/or risk factors. The molecular signatures of resilience/risk in the brain, however, have not been thoroughly described, partly due to the scarcity of healthy APOEe4 carriers. This study addresses this gap using a novel multi-tissue, multi-omic dataset from the Religious Order Study and Memory and Aging Project cohorts highly enriched in APOEe4 carriers with and without LOAD.
View Article and Find Full Text PDFAlzheimers Dement
December 2024
Department of Pathology, University of Sao Paulo Medical School, São Paulo, São Paulo, Brazil.
Background: Individuals meeting neuropathological criteria for Alzheimer's disease (AD) may manifest with atypical clinical syndromes. Past work showed that the neurobiological basis for these differences is related to specific neuronal vulnerabilities for tau pathology. For instance, amnestic cases have a higher burden of neurofibrillary changes in CA1.
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