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 16 of 16 for “"Cortical response"”.
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Processing of transient stimuli by the visual system of the rat
While three decades of intensive cortical electrophysiology using a variety of sustained visual stimuli has made a significant contribution to many aspects of visual function, it has not supported the existence of intracortical circuit operations in cortical processing. This study investigated …
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Differenzierung zwischen axonaler und demyelinisierender Schädigung bei Patienten mit Multipler Sklerose durch Untersuchung der hochfrequenten SEP-Komponenten nach Medianus-Stimulation
… (HFOs) are superimposed onto the primary cortical response (N20) in human median nerve somatosensory evoked potentials (SEPs). HFOs are generated both in deep axon segments of thalamo-cortical projection neurons and at the primary somatosensory cortex. To test the hypothesis that HFOs …
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The effect of television viewing on college students : an EEG analysis of cerebral asymmetry
… sought to investigate this area by looking at cortical response to television viewing.</p> <p>The subjects in the study consisted of 24 men and 24 women (m=l9 .6 years) who were monitored for bilateral EEG alpha (8-13 Hz) brain wave production while viewing a television commercial (verbal and …
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Exercise-Induced Modulation of Early Visual Evoked Responses: Chromatic and Achromatic Pathways
… exercise-induced modulations of visual responses have beenconstrained by (1) generalized stimuli that cannot distinguish global mechanisms from pathway- specific effects, (2) stimulus-directed tasks that may conflate exercise costs with attentional effects, and (3) traditional EEG …
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Unterschiedliche Generierung niedrig- und hochfrequenter Komponenten somatosensorisch evozierter Potenziale (SEP) beim Menschen
… (HFOs) which are superimposed onto the primary cortical response 'N20'. This study aimed to further clarify the cortical and subcortical structures involved in the generation of the HFOs. 128-channel recordings were obtained to right median nerve stimulation of 10 right-handed healthy human …
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Visual cortical plasticity : the role of parvalbumin expressing inhibitory neurons and abnormalities in models of neurodevelopmental disorders
The roles played by cortical inhibitory neurons in experience-dependent plasticity and learning are not well understood. Here we evaluate the participation of parvalbumin-expressing (PV+) GABAergic neurons in two forms of experience-dependent modification of primary visual cortex (V1) in adult …
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Evaluation of the visual pathway with ERG, mfERG and mfVEP in inherited eye disorders
… ERG demonstrates an absence of the rod response but normal amplitudes for the cones. However, after prolonged dark adaptation the rods recover completely. MfERG can be used for objective documentation of the disturbed macular function. Patients with retinitis pigmentosa may not always …
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Interrogating the infant mind with fMRI
… unclear whether the basic structure of adult cortical organization is present in young infants. Chapter 2 describes innovations to improve infant fMRI techniques including the design of MRI-safe infant headphones and a size-adaptive 32-channel infant head coil. These improvements resulted in …
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Postural Sway, EEG and EMG Analysis of Hip and Ankle Muscles during Eight Balance Training Tasks
… of this study was to examine postural sway, cortical response and muscle activation of the hip and ankle muscles during eight balance tasks routinely used in sensorimotor training. This was a single group repeated measure study. The postural sway; the power of alpha, beta and sigma wave …
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Zirkadiane Modulation hochfrequenter SEP-Komponenten (600 Hz) nach Medianusstimulation in Abhängigkeit von tonischer alertness
… oscillations superimposed onto the primary cortical response “N20”, which can be obtained by digitally filtering the wide-band SEPs. Previous EEG- and MEG-studies indicated these high-frequency oscillations (HFOs) to reflect at least in part activity generated at the thalamus and in the …
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Mechanisms of ocular dominance plasticity in the juvenile and adult mouse visual cortex
… deprivation (MD) leads to a rapid weakening of responses evoked through the deprived eye followed by a delayed strengthening of non-deprived eye inputs. It has been proposed that these bidirectional changes occur as a three-stage process: first, degradation of patterned visual input weakens …
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Imaging plasticity and structure of cortical maps in cat and mouse visual cortex
… by pairing a visual stimulus with an intracortical electrical stimulation. We found that the direction of plasticity within orientation maps depends critically on the relative timing between visual and electrical stimulation on a millisecond time scale: a shift in orientation preference …
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Spatio-temporal structure of thalamically evoked activity in the barrel cortex
… incoming information conveyed via thalamocortical pathways and ongoing activity thereby extracting the relevant details from spatio-temporal dynamic stimuli that carry information about the environment. In the course of this, the cortical response to the incoming information depends on the …
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A Neurophysiological Investigation of Listening Effort in Normal Hearing Adults Using fNIRS and Pupillometry
… not fully understood. Importantly, the pupillary response can be used to index listening effort, such that pupil size increases with increasing cognitive demand. I proposed that pupillometry can be used to characterize the cortical response, such that changes in pupil size would be associated with …
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State-space modeling of MEG time series
… and improves the localization of the evoked cortical response. In summary, we establish the feasibility of non-approximate SSM-based analysis of high-dimensional state-space models using a distributed-memory implementation of an accelerated KS+EM algorithm. We develop two novel algorithms to …
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Who is that talking? Function and dysfunction of efference copy and corollary discharge in healthy people and schizophrenic patients
… stimuli are "expected" and so the neural response to these stimuli is attenuated compared to externally generated sensory stimulation. This mechanism enables the brain to distinguish "self" from "other" <br>A dysfunction in this internal model has been hypothesized by Frith and colleagues …