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.
Results
Showing 1 to 20 of 21 for “"high gamma"”.
-
Nonuniform Power Changes and Spatial, Temporal and Spectral Diversity in High Gamma Band (>60 Hz) Signals in Human Electrocorticography
High-gamma band: >60Hz) power changes in cortical electrophysiology are a reliable indicator of focal, event-related cortical activity. In spite of discoveries of oscillatory subthreshold and synchronous suprathreshold activity at the cellular level, there is an increasingly popular view that …
-
Granular retrosplenial cortex layer 2/3 generates high frequency oscillation events coupled with hippocampal sharp wave-ripples and Str. LM high gamma
… (gRSC) is an associational area that exhibits high frequency oscillations (HFOs) during both hippocampal theta and SPW-Rs, and is potentially a period when the gRSC interprets incoming content from the hippocampus during encoding and systems consolidation. However, the precise laminar …
-
Development of a Borehole Log Signature for Oceanic Anoxic Events and Its Application to the Gulf of Mexico
… A general, though not fool proof, signature of high gamma ray, uranium, neutron porosity and low density was seen in nearly all of the ODP holes. Using this signature 20 potential OAE intervals were identified in the Gulf of Mexico.
-
Role of the precentral cortex in adapting behavior to different mechanical environments
… sensorimotor maps are adapted to maintain a high level of movement performance regardless of the mechanical environment. This dissertation explored the contribution of the precentral cortex to this process of motor adaptation. In the first experiment, we recorded precentral neural activity in …
-
Electrocorticographic Neural Correlates of Arm Movements and Associated Goal Orientation in Humans
… tuning was best represented spectrally in a high gamma band from around 90-150 Hz in the primary motor cortical regions. In dorsolateral prefrontal cortex: DLPFC), cortical activity in the 150-250 Hz band of the ECoG signal showed robust, non-directional encoding for the goal during both the …
-
Studies of Mammary Amino Acid Transport
… (1) Mammary tissue was shown to have relatively high (gamma)-glutamyl transpeptidase activity, and activity increased at the onset of lactation. This increase was shown to be dependent on prolactin. The timing and magnitude of the changes in (gamma)-glutamyl transpeptidase activity during …
-
Efeitos dos estímulos elétricos senoidais na resposta induzida cerebral: estudo da seletividade das fibras sensitivas
… and ERD/ERS profiles of the alpha, beta, gamma and high-gamma bands were evaluated 3 kHz and 5 Hz, at intensities 1,2xLS, 2xLS and 3xLS. Results indicate habituation in the contralateral parietal region for the 3 kHz stimulus, as opposed to 5 Hz’s, at 1.2xLS in the alpha band. Results show …
-
Temporal dynamics of MEG phase information during speech perception: Segmentation and neural communication using mutual information and phase locking
… found that both low (delta and theta) and high (gamma) frequency information is utilized to facilitate communication between brain areas thought to underlie speech perception. Distinct auditory/speech networks that operated exclusively using these frequencies were revealed, suggesting a …
-
Genetische Prädisposition der intrahepatischen Schwangerschaftscholestase : Mutationsanalyse des Phospholipidtransporters ABCB4 und der Gallensäurenexportpumpe ABCB11
… exogenous influence and, in patients with high gamma-glutamyl transferase (GGT), heterozygous mutations in the ABCB4 gene encoding the hepatic canalicular phospholipid transport protein MDR3 play a role in pathogenesis. Mutations in the ABCB11 encoding the bile salt export pump BSEP may as …
-
Cerebellar Coordination of Neuronal and Behavioral Rhythms
… each structure. Resting-state coherence of gamma oscillations between LS and mPFC was significantly increased in ataxic mice relative to their controls. Ataxic animals also showed significantly larger Granger causality from the mPFC to cerebellar LS in gamma frequencies compared to …
-
The effects of periodic and non-periodic inputs on the dynamics of a medial entorhinal cortex layer II stellate cell model
… peak in the signal gain which occurs at a much higher frequency (in the high gamma frequency band). These findings depart from the linear prediction. The corresponding linearized model does not exhibit three preferred frequency peaks for current inputs and a much higher frequency for conductance …
-
MEG coherence imaging in dyslexia: Activation of working memory pathways
… cortex and right superior temporal gyrus and higher, likely compensatory, activation in the right fusiform gyrus, left parahippocampal gyrus, and left precentral gyrus. Dyslexics performing a SWM task showed significantly reduced MEG coherence and lower 1) right frontal connectivity, 2) right …
-
Determination of Heterogeneity by High-Resolution Seismic Reservoir Characterization in the Heavy Oil Temblor Reservoir of Coalinga Field, California
… identified on seismic data and correlated to high-gamma coarsening-upward sands on logs and cores. The deeper one, shifting towards SSE with depth, lies between the Base Temblor and Buttonbed unconformities both in the southwestern and northwestern parts of the study area and is scattered in …
-
Neural correlates of auditory perceptual organization measured with direct cortical recordings in humans
… By sampling from widespread brain areas with high temporal resolution while participants simultaneously engaged in streaming and jittered multi-tone masking paradigms, the present experiments sought to overcome limitations inherent in previous work, namely sampling extent, resolution in time …
-
Investigations of Phytoplankton Diversity in Chesapeake Bay
… containing 1480 taxa was characterized as one of high richness and low evenness, with a single species accounting for at least half of the biomass in almost one third of all samples examined. High gamma-diversity was attributed to seasonal succession of dominant flora and spatial heterogeneity …
-
Photoneutron spectra from monoenergetic photons on Pb208 in the giant resonance
… from Pb208 was observed at 1150 for incident gamma ray energies of 9.90 MeV to 16.87 MeV. The University of Illinois 25 MeV betatron and bremsstrahlung monochromator facility were used to produce the gammas and determine their energies within 1.7% (full width). Neutrons above 200 keV were …
-
Design and development of radiation-resistant and low-noise semiconductor transistors for applications in high frequency communication systems
… in order to optimize their performance in high power microwave devices. A number of properties have been studied, starting from DC transport properties in bare 2DEG channels up to investigation of phase noise of a X-band HEMT-based oscillator. This work is separated into five parts. In the …
-
Stability of nickel-base superalloys for turbine disc applications
… which are deleterious to alloy performance. High $\gamma^\prime$ volume fractions, which are needed to provide high-temperature strength, exacerbate the problem by increasing the concentration of these elements in the $\gamma$ phase. Therefore, an understanding of TCP formation and the …
-
Coupled Correlates of Attention and Consciousness
… More generally, attention is a state of high arousal and salient conscious experience. Current models of consciousness suggest that both slow wave sleep and Propofol-induced unconsciousness lie at one end of the consciousness spectrum, while attentive states lie at the other end. …
-
Anatomical and Functional Organization of Domain-General Brain Regions
… revealed localized power increases in the gamma range (>30 Hz) that overlap with a canonical mask of the fronto-parietal control network. These findings contrast with spatially non-specific power decreases in the beta range (12-30 Hz). Thus, using similar task difficulty manipulations, …
Page 1 of 2