Open Access. Powered by Scholars. Published by Universities.®
Articles 1 - 2 of 2
Full-Text Articles in Medicine and Health Sciences
The Impact Of Synchrony On Neuronal Coding And Behavior, Natasha Kharas
The Impact Of Synchrony On Neuronal Coding And Behavior, Natasha Kharas
Dissertations & Theses (Open Access)
Cortical columns represent the elementary functional and computational module of the neocortex. Although much is known about its laminar structure and synaptic connectivity, how patterns of spiking activity propagate within columnar circuits when the state of the brain changes remains poorly understood. We used multi-electrode laminar arrays to reveal that brain state modulates the propagation of neural activity across the layers of early and mid-level visual cortex (areas V1 and V4). We found a high prevalence of neuronal synchrony (vigorous (On) and weak (Off) spiking) in rest but low prevalence of synchrony during wakefulness. We next tested whether propagation of …
Investigating Diffusion Tensor Imaging Correlates Of Cognitive Impairment In Idiopathic Normal Pressure Hydrocephalus And Alzheimer's Disease, Omar Hasan, Omar Hasan
Investigating Diffusion Tensor Imaging Correlates Of Cognitive Impairment In Idiopathic Normal Pressure Hydrocephalus And Alzheimer's Disease, Omar Hasan, Omar Hasan
Dissertations & Theses (Open Access)
Modest expansion of the human brain cerebrospinal fluid (CSF)-filled ventricles is normal with aging, and because of this, it can be difficult for physicians to accurately diagnose and treat enlarged ventricles (ventriculomegaly), called hydrocephalus1 (fluid or water in the brain) Ventriculomegaly occurs due to an obstruction (such as a blood clot or tumor), or a change in CSF absorption2. Primary hydrocephalus, also called idiopathic normal pressure hydrocephalus (iNPH), is non-obstructive and may be comorbid with other neurodegenerative diseases such as Alzheimer’s disease (AD) or frontotemporal dementia (FTD). Clinically, it can be difficult to tell whether the pathophysiological …