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 81 for “"Auditory cortex"”.
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Prediction of templates in the auditory cortex.
In this study variation of human auditory evoked mismatch field amplitudes in response to complex tones as a function of the removal in single partials in the onset period was investigated. It was determined: 1-A single frequency elimination in a sound stimulus plays a significant role in human …
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Thalamocortical forward modulation in the auditory cortex
Auditory masking is a psychoacoustic phenomenon with strong physiological correlates in the central auditory system such as in the primary auditory cortex. The caveat of conventional two-tone paradigms in testing the neurophysiology of forward masking (i.e., forward suppression) is that tones are …
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Predictive Novelty Detection in Songbird Auditory Cortex
… detects both types of novelty, we studied an auditory region of the avian brain that performs both absolute and relative novelty detection. We introduce a predictive model, called the Agnotron, that is capable of performing both kinds of novelty detection with the same circuit mechanism. Armed …
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Representation of statistical sound properties in human auditory cortex
… of statistical sound properties in human auditory cortex. It addressed four key aspects in auditory neuroscience: the representation of different analysis time windows in auditory cortex; mechanisms for the analysis and segregation of auditory objects; information-theoretic constraints on …
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Nonlinear Representation of Auditory Stimuli Across the Auditory Cortex
… 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 scale …
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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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Lateralized Temporal Integration Properties of the Mouse Auditory Cortex
… modulating signals and the ability of the auditory system to perceive such transient signals is a remarkable phenomenon. The mechanism by which the auditory cortex (ACx) is believed to be capable of processing these signals is through recurrent connectivity in the cortical circuits. …
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Mesoscopic dynamics of pitch processing in human auditory cortex.
… that pitch is decoded in the peripheral auditory system fail to explain the perception of complex stimuli. More recent mechanistic models, focused on how subcortical structures process periodic discharges of the auditory nerve activity, are unable to explain fully key aspects of the …
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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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Experience dependent coding of intonations by offsets in mouse auditory cortex
… is transformed between primary to secondary auditory cortical areas. Moreover, learning in a natural communication paradigm engages auditory cortical plasticity mechanisms in ways that are distinct from laboratory operant training paradigms, emphasizing the importance of studying learning in …
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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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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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Long Term Plasticity Induced by Intracellular Tetanization in the Rat Auditory Cortex
… changes at non-activated synapses. In visual cortex a potential candidate mechanism for normalization is plasticity induced by purely postsynaptic protocol, intracellular tetanization. Here we asked if intracellular tetanization can induce long-term plasticity in auditory cortex. We recorded …
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Denoising techniques reveal neural correlates of modulation masking release in auditory cortex
… hearing impaired (HI) individuals to regain auditory perception in quiet settings. However, despite advances in hearing aid technology, HI individuals do not perform as well in situations with background sound as normally hearing (NH) listeners. An extensive literature demonstrates that when …
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Neural circuits for solving the cocktail party problem in mouse auditory cortex
… within these circuits. An example problem in the auditory domain is how cortical circuits process complex natural sounds amidst competing stimuli from different spatial sources, also known as the "cocktail party effect". A pre-study recorded cortical responses in songbirds and found that neurons …
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Abnormal Anatomy of the Auditory Cortex in Schizophrenic Brains with Auditory Hallucinations
… psychiatric literature has suggested that the auditory cortex region is smaller in people with schizophrenia who experience auditory hallucinations than in normal control individuals. These findings are not without controversy. While there has been significant research considering volumetric …
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Functional magnetic resonance imaging of the frequency organization of human auditory cortex
Thesis (Ph.D.)--Harvard--Massachusetts Institute of Technology Division of Health Sciences and Technology, 1998.
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The functional organization of the auditory cortex in myotis lucifugus, an echolocating bat
This document only includes an excerpt of the corresponding thesis or dissertation. To request a digital scan of the full text, please contact the Ruth Lilly Medical Library's Interlibrary Loan Department (rlmlill@iu.edu).
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Impact of Thalamocortical Synaptic Transmission on Input specific plasticity in Mouse Auditory Cortex
… established that learning and experience lead to auditory cortical plasticity that is highly specific to the frequency of the acquired sound. Frequency specificity is demonstrated as the shift in the receptive field of cortical neurons towards the frequency of the acquired sound. Jafari and others …
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