Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 40 for “"intracortical"”.
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3-Dimensional Intracortical Neural Interface For The Study Of Epilepsy
<p>Epilepsy is a chronic disease characterized by recurrent, unprovoked seizures, where seizures are described as storms of uncontrollable neuro-electrical activity within the brain. Seizures are therefore identified by observation of electrical spiking observed through electrical contacts …
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Device design factors for enhancing the functionality of chronic intracortical microelectrodes
<p>Intracortical microelectrodes are devices used in brain-computer interfaces (BCI) to help regain lost motor, sensory, and cognitive functions of individuals with neurological disorders. However, the long-term performance of microelectrode arrays is hampered by a series of inflammatory tissue …
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Effects of Dip-coated films on the Properties of Implantable Intracortical Microelectrodes
<p>The successful clinical use of implantable intracortical microelectrodes (ICMs) to treat certain types of deafness, blindness, and paralysis is limited by a reactive tissue response (RTR) of the brain. This RTR culminates in the formation of a tight glial scar and a loss of neuronal density …
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Relating cortical bone mechanics to intracortical pore morphology, distribution and remodeling history within the fibula diaphysis
… The aim of this study was to investigate the intracortical compression-induced strain energy distribution, and determine whether the intracortical pores associated with high strain energy density (SED) in the surrounding bone have a different morphology, distribution and remodeling history …
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Seeking the neural basis of grammar : English noun and verb morphological processing investigated with rapid event-related fMRI and intracortical electrophysiology
(cont.) the functionality of the fMRI data analysis and visualization tools used at Massachusetts General Hospital. I analyze and interpret an 18-subject fMRI experiment I ran using the new task design and software tools. Finally, I present preliminary findings on linguistic questions as well as …
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Age-related changes in intrahemispherical interactions within motor areas of the brain
… Several studies examined the effects of intracortical inhibition during a motor task but the evidence between younger adults and elderly is limited. Objectives: The aim of our experiment is to explore the influence of aging on the intracortical inhibitory system during a motor reaction …
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Plasticity of the cortical representation of finger extensors induced by paired associative stimulation
… First the role of interstimulus timing and intracortical facilitation on modulation of cortical excitability is explored in the extrinsic hand muscles by showing that PAS can be conditioned by these facilitatory intracortical networks. Using standard indirect approaches utilizing peripheral …
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Cortical Pyramidal Neuron Subtype Classification and Visual Response Diversity
… are hypothesized to correspond to thalamic and intracortical inputs, respectively. Cluster analysis of the dominant late response does not support evidence for subtypes.Our study shows that the answer to the posed question appears to be both yes and no. Visual responses to whole-field flashes …
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Estudio mediante estimulación magnética transcraneal del cerebelo y de la corteza parietal posterior en la distonia primaria cervical
… intra-cortical a intervalo corto y facilitación intracortical (SICI/ICF) y 2c sobre la inhibición cerebelo-cortical (CBI). 3. Comparar, entre pacientes y controles, los efectos de la estimulación repetitiva cerebelosa tipo cTBS 3a sobre la excitabilidad cortical (protocolo 20 Test), 3b sobre la …
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From thoughts to actions: cracking the neural code across scales and modalities
… scalp EEG, invasive stereotactic EEG, and intracortical microelectrode arrays. At the macroscopic level, I first demonstrate how low-frequency phase dynamics in scalp EEG relate to fluctuations in attention. Using information-theoretic and signal processing approaches, I show that EEG phase …
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CHOLESTEROL INDUCED GENE EXPRESSION CHANGES IN THE BRAIN AND CEREBRAL VESSELS
… on gene expression in both regions. Acute intracortical administration of oxysterols at low concentration was more potent in inducing gene expression alterations than cholesterol. In contrast, consumption of a high-cholesterol diet for an extended period chronically induced massive gene …
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Skilled Behaviour and Bilateral Motor Map Expression
… the electrical kindling model and short-duration intracortical microstimulation (SD-ICMS). Forelimb motor map movements changed considerably from contralateral in sham-kindled rats to ipsilateral and bilateral in rats kindled for over 5 sessions. Furthermore, bilateral movement representations …
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Mechanisms of ocular dominance plasticity in the juvenile and adult mouse visual cortex
… synapses without any influences of polysynaptic intracortical inhibition. In the second part of my work, I try to resolve the nature/identity of the molecular mechanism that underlies the regulation of [theta]m. Using a transgenic mouse model, I find that a reduction in the NR2A/B subunit ratio …
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ΣΥΜΒΟΛΗ ΤΟΥ ΑΚΤΙΝΟΛΟΓΙΚΟΥ ΕΛΕΓΧΟΥ ΣΤΗΝ ΕΚΤΙΜΗΣΗ ΤΗΣ ΝΕΦΡΙΚΗΣ ΟΣΤΕΟΔΥΣΤΡΟΦΙΑΣ
… OF SUBPERIOSTEAL RESORPTION IN 47%. HOWEVER WHEN INTRACORTICAL AND ENDOSTEAL BONE RESORPTION WERE INCLUDED THE PERCENTAGE PATIENTS WITH EVIDENCE OF BONE LOSS WAS 62%. RADIOLOGICAL FINDINGS WERE CORRELATED WITH CLINICAL AND LABORATORY PARAMETERS. SUBPERIOSTEAL RESOPRTIONS OF MIDDLE PHALANGES …
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Exploring Microstructural Signatures of Physiological Stress through Cross-Sectional Geometry and Cortical Bone Histology
… accounting for variation across periosteal, intracortical, and endosteal membranes. ArcGIS Pro was used to manually annotate remodeling events (including osteon morphotype) and ImageJ was used to automate osteocyte lacunae counts, allowing for histomorphometrics osteon morphotype and …
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Effects of load and fatigue during unilateral resistance training on neuromuscular adaptations.
… excitabilidad cortical y disminuye la inhibición intracortical. Sin embargo, se observó una falta de consistencia en los resultados, probablemente debido a la influencia de variables de entrenamiento como el tipo de contracción, la intensidad de entrenamiento, la fatiga o la estrategia para el …
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Representation of Whole-body Navigation in the Primary Sensorimotor and Premotor Cortex
… the design and implementation of the first intracortical BMI</p><p>for continuous wheelchair navigation. Two rhesus monkeys were chronically im-</p><p>planted with multichannel microelectrode arrays that allowed wireless recordings</p><p>from ensembles of premotor and sensorimotor cortical …
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