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 26 for “"primary auditory cortex"”.
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Computational Analysis of Functional Imaging in the Primary Auditory Cortex
… principles of organizational structure in the auditory cortex of multiple species has been somewhat challenging with functional imaging as the studies have failed to reproduce results seen in electrophysiology. One difference might result from the way most functional imaging studies record the …
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Anatomical identification of primary auditory cortex in the developing gerbil
… and functionally. Furthermore, the gerbil auditory cortex is particularly amenable to investigation in that the gerbil's onset of hearing occurs approximately after 14 days of postnatal life. Despite these advantages of the gerbil for auditory cortex development not much is known about the …
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Feature Topography and Sound Intensity Level Encoding in Primary Auditory Cortex
The primary auditory cortex: A1) in mammals is one of the first areas in the neocortex that receives auditory related spiking activity from the thalamus. Because the neocortex is implicated in regulating high-level brain phenomena, such as attention and perception, it is therefore important in …
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Acute Physiological Effects of Brain-Generated 17β-Estradiol in the Rodent Primary Auditory Cortex
… that E2 is rapidly synthesized in the auditory forebrain in response to salient auditory experience, and this locally-synthesized E2 contributes to auditory signal processing and learning. Despite the role of E2 in auditory processing and learning, together with its effects on synaptic …
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Development and plasticity of the functional laminar mesoscale organization of the primary auditory cortex
… during a critical period of development is the primary auditory cortex (A1). The functional architecture of A1 in adult mammals has been widely studied on a macroscale and single-cell level, and it is evident that this sensory area is characterized by a tonotopic gradient of frequency preference …
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Representation of speech in the primary auditory cortex and its implications for robust speech processing
Speech has evolved as a primary form of communication between humans. This most used means of communication has been the subject of intense study for years, but there is still a lot that we do not know about it. It is an oft repeated fact, that even the performance of the best speech processing …
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Mechanisms of inhibition and neuronal integration for signal processing in the primary auditory cortex of the Mongolian gerbil (Meriones unguiculatus)
… organization of inhibitory circuits in the neocortex. To investigate the contribution of GABAergic inhibition to frequency tuning in the different cortical layers, single and multi units were recorded in near-radial penetrations before and during iontophoretic application of the GABAA-receptor …
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Source activity and tonotopic organization of the auditory cortex in musicians and non-musicians
… the processing of sinusoidal tones in the auditory cortex of nine professional musicians, nine amateur musicians and nine non-musicians. The frequency of the tones ranged from 100 to 5600 Hz. On average, the evoked source activity of the primary auditory cortex occuring at 19-30 ms was 87 …
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FMRI studies of effects of hearing status on audio-visual speech perception
… to be active for speechreading included: visual cortex, auditory cortex (but not primary auditory cortex), speech motor network areas, supramarginal gyrus, thalamus, superior parietal cortex and fusiform gyrus. For hearing impaired subjects, in addition to the areas listed above, Heschl's gyrus, …
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Protein and viral partitioning in two-phase aqueous micellar systems
… of labeling. Changes were seen not only in primary auditory cortex, but also in other cortical fields that have not been studied before. In contrast, there was little change in brainstem (inferior colliculus, dorsal and anteroventral cochlear nucleus) labeling. Second, the effect of past …
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Adenosine Production Is Essential for Closing the Critical Period of Cortical Plasticity
… the mechanism of cortical map plasticity in the primary auditory cortex (AI) occurs at thalamocortical (TC) synapses in the form of synaptic plasticity. As the critical period closes, adults develop an adenosine-dependent presynaptic gate that prevents TC synaptic plasticity from occurring. By …
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Nonlinear Representation of Auditory Stimuli Across the Auditory Cortex
<p>The neural evoke activity to pure tones in primary auditory cortex has been systematically studied for many years, as has the spatial organization of these responses. Unlike pure tones, natural sounds possess complex spectro-temporal structures across frequencies. How simple tuning properties …
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Auditory Cortex Projections Target the Peripheral Field Representation of Primary Visual Cortex
… present study was to identify projections from auditory to visual cortex and their organization. Retrograde tracer wheat germ agglutinin conjugated to horseradish peroxidase was used to identify the sources of auditory cortical projections to primary visual cortex (areas 17&18) in adult cats. …
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Encoding of Ultrasonic Communication Signals in Rat Auditory Cortex
… of rat vocalizations, and in the study of auditory objects in general. We develop a novel system for parameterizing, purifying, and modifying rat USVs. We model neural responses to USVs, and show that a simple model based on frequency modulation outperforms a more traditional, …
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Neural abnormalities underlying tinnitus and hyperacusis
… functional magnetic resonance imaging (fMRI) and auditory brainstem responses (ABRs) to measure sound-evoked activity in the auditory pathway. Subjects with clinically normal hearing thresholds, with and without tinnitus, underwent fMRI or ABR testing and behavioral assessment of sound-level …
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Invasive and Noninvasive Brain Stimulation Strategies for the Treatment of Tinnitus
The central auditory system consists of a series of relay stations at which auditory information is processed in stages before reaching the auditory cortex for sound perception. However, descending projections and non-auditory inputs into the central auditory system also play a vital role in …
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On the role of neuronal oscillations in auditory cortical processing
… was to describe the physiological mechanisms of auditory attention using direct electrophysiological recordings in macaque primary auditory cortex (A1). A major focus of my research was on the role ongoing neuronal oscillations play in attentional modulation of auditory responses in A1. </p> …
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Speech Network Regional Differences in Bulbar Amyotrophic Lateral Sclerosis: Neuroimaging and Neuropathology Investigations
… and diffusivity abnormalities underlying left primary auditory cortex (PAC) and posterior superior temporal gyrus (pSTG). Greater bulbar motor dysfunction was associated with greater structural abnormalities in selected SpN regions, while limb and disease severity were not. The second study …
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Examing the evidence for a pitch centre in human auditory cortex: a multi method approach
… evaluate the evidence for a pitch centre within auditory cortex according to the four pitch criteria: 1) pitch selectivity, 2) pitch constancy, 3) covariation with pitch salience, and 4) accounting for confounding factors, that were described in an article by Hall and Plack (2009). An fMRI study …
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The Interaction of Intensity and Deviance on Auditory Event-Related Potentials: Findings Using Principal Component Analysis (PCA) of Current Source Densities (CSDs)
… studies investigating the loudness-dependency of auditory evoked potential (LDAEP) have shown a relationship between the intensity of an auditory stimulus and neuro-physiological or -chemical activity of the primary auditory cortex. Unfortunately, these two bodies of literature remain disjointed. …
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