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 70 for “"Evoked potential"”.
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Visual Evoked Potential Measures of Blur Adaptation
… effects through the measurement of the visual evoked potential (VEP). VEP measurements were taken over time as subjects were exposed to a reversing sine-wave grating both with blur and with blur adaptation. The VEP measurement gave insight about the visual acuity, which can be used to interpret …
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Pre-Saccadic Modulation of the Visually Evoked Potential
… electroencephalography (EEG). Event related potentials were compared for attended and unattended stimuli in three tasks: one involving saccades only, one involving saccades and a perceptual task, and one involving a perceptual task without eye movements. We found that it is unlikely that the …
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Stimulus intensity effects on the steady-state visual evoked potential
… that the amplitude of the steady-state visual evoked potential (SSVEP), a neural response to repetitive visual stimuli, is positively correlated with stimulus intensity. SSVEPs are often used as input mechanisms for brain-computer interfaces (BCIs), systems that establish a direct communication …
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The mouse visually evoked potential : neural correlates and functional applications
The visually evoked potential (VEP) is a local field potential (LFP) evoked in visual cortex in response to visual stimuli. Unlike extracellular single unit recordings, which allow us to probe the function of single spiking cells acutely, the chronic VEP technique gives us insight into ensemble …
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Use of evolutionary algorithms to select filters for evoked potential enhancement
Evoked potentials are electrical signals produced by the nervous system in response to a stimulus. In general these signals are noisy with a low signal to noise ratio. The aim was to investigate ways of extracting the evoked response within an evoked potential recording, achieving a similar signal …
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A distance adaptable brain-computer interface based on steady-state visual evoked potential
… BCIs include motor sensory rhythm, slow cortical potential, P300 and steady-state visual evoked potential (SSVEP). Compared to the other EEG based BCI paradigms, SSVEP based BCI has the advantage of high information transfer rate, high detection rate, less user training time required and commands …
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Contrast adaptation reveals increased organizational complexity of chromatic processing in the visual evoked potential
… directions in color space. The chromatic visual evoked potential (crVEP) has demonstrated chromatic processing selective for cardinal axes of color space. However, crVEP evidence for higher-order color mechanisms is lacking. The present study aimed to assess the contribution of lower and higher …
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Comparison of tripolar and traditional recording of the pattern-reversal visual evoked potential: signal and noise
… noise reduction in recording muscle-related potentials and seizure detection. However, less has been done to study the efficacy of this promising technology for studying the visual system. Here, we investigate TCRE tEEG recording to evaluate any potential drawbacks or benefits over …
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The Contingent Negative Variation and Late Evoked Potential as a Function of Task Difficulty and Short-Term Memory Load
Made available in DSpace on 2014-12-10T21:08:01Z (GMT). No. of bitstreams: 1 7511829.pdf: 5973362 bytes, checksum: 9c86105ad062045630e4070ecf5e0f46 (MD5) Previous issue date: 1974
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Manatee Sound Localization: Performance Abilities, Interaural Level Cues, and Usage of Auditory Evoked Potential Techniques to Determine Sound Conduction Pathways
… as compared to in front of them. Auditory evoked potential (AEP) techniques were used to map manatee sound conduction pathways in-water and in-air using 15 and 24 kHz carriers. All subjects produced AEPs at each position the transducer was placed, however specific sound conduction …
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Surgeon directed transcranial motor evoked potential spinal cord monitoring in spinal deformity surgery: A review of viability, safety and efficacy
… directed intra-operative transcranial motor evoked potential (TcMEP) monitoring a useful compromise. Our experience using surgeon directed TcMEP is presented in terms of viability, safety and efficacy. Methods A retrospective review was performed on a single surgeon's prospectively maintained …
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The Development of Flash Visual Evoked Potential Techniques for the Diagnosis of Visual Disorders with Dense Opacities of the Optic Media
Visual evoked potentials (VEP)were recorded in a large normal population. Significant age differences were found, and the P2 component (latency 116 m.sec.) was the most consistent component of the VEP both between and within the individuals. The validity of the normal VEP criteria were tested in …
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Electrophysiological and behavioural measures of central auditory processing in adult cochlear implant users
… to determine the relationship between auditory evoked potential measures, speech perception and frequency discrimination in 12 experienced adult cochlear implant (CI) users and to compare the evoked potential results in the CI subjects to those of a group of age- and gender-matched control …
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Electrically Evoked Auditory Potentials Recorded at Three Levels of the Auditory Pathway From Multichannel Cochlear Implant Subjects: Characterization and Comparison to Behavioral Measures
… and ELAR with regard to latency, amplitude and evoked potential thresholds (EPT). Comparisons between the EPTs and behavioral measures suggest that thresholds of either the Wave V, the Na-Pa complex, or the N1-P2 complex may be used to select stimulus levels that are audible for subjects, …
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Stimulus parameters influencing cortical responses by transcranial magnetic stimulation targeting I-wave dynamics : duration, intensity and interval between interventions
… excitability changes, single-pulse motor evoked potential (MEP) amplitude before and following the intervention, and paired-pulse motor evoked potential (iMEP) amplitude during the intervention from the first dorsal interosseous (FDI) muscle were recorded in the studies. In Study 1, the …
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Cognitive Functioning of Male Adult Children of Alcoholics and Control Subjects While Under the Influence of Acute Alcohol Intoxication
… addition to certain components of the auditory evoked potential, supporting speculation that biological or psychological markers exist as predictors of future alcoholism. The present study examined 20 males ACA and 20 male control subjects under either placebo or alcohol experimental conditions …
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State-space modeling of MEG time series
… neural activity using MEG recordings made in evoked-potential studies, in which the subject is repeatedly presented with a stimulus and only the stimulus effect is of interest. In contrast with other dynamic source-localization techniques, StimEM accepts arbitrary description of neural …
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