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 32 for “"neural coding"”.
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Neural coding of sound envelope in reverberant environments
… To assess the effect of reverberation on the neural coding of amplitude envelope, we recorded from single units in the inferior colliculus (IC) of unanesthetized rabbit using sinusoidally amplitude modulated broadband noise stimuli presented in simulated anechoic and reverberant environments. …
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The Impact of Cortical State On Neural Coding and Behavior
… the state of cortical networks influence sensory coding in neural circuits and the behavior of the animal are unknown. To shed light on this issue, we conducted multi-unit electrophysiology experiments in visual areas V1 and V4 of behaving monkeys. First, we studied the impact of neural population …
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Effects of Hearing Aid Amplification on Robust Neural Coding of Speech
… is growing evidence that relative timing in the neural signals (known as spatiotemporal coding) is important for speech perception, but there is little research that relates spatiotemporal coding and hearing aid amplification.</p> <p>This research uses a combination of computational modeling and …
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Efficient Neural Coding Under Resource Constraints: A Rate-Distortion Theory Perspective
L'abstract è presente nell'allegato / the abstract is in the attachment
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Task-optimized models of human hearing link perception and neural coding
… The ears convert pressure waves into patterns of neural activity which the brain can use to make powerful inferences about the source. While extensive modeling efforts in the past few decades have resulted in well-established computational descriptions of peripheral auditory coding, comparatively …
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Neural coding of time-varying interaural time differences and its relation to perception
… encode time-varying location cues and how the neural code relates to perception. Our focus was on time-varying interaural time differences (ITD), one of the main cues for localizing sounds in the horizontal plane. We recorded from single neurons in the inferior colliculus (IC) in the auditory …
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Optogenetic Interrogation of Primary Visual Cortex and Its Impact On Neural Coding and Behavior
… ability to causally manipulate the activity of neural populations and monitor the resultant effects. Here we focus on primary visual cortex (V1), which has been shown to be crucial for visual perception, and utilize optogenetic tools to render the activity of genetically- defined neural …
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Minimum-error, energy-constrained source coding by sensory neurons
Neural coding, the process by which neurons represent, transmit, and manipulate physical signals, is critical to the function of the nervous system. Despite years of study, neural coding is still not fully understood. Efforts to model neural coding could improve both the understanding of the …
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Invasive and Noninvasive Brain Stimulation Strategies for the Treatment of Tinnitus
… system also play a vital role in shaping neural coding along the auditory pathway. The work in this thesis seeks to investigate the organization and role of these modulatory pathways of the central auditory system, particularly to devise and improve upon existing neuromodulation strategies …
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Modelling the synaptic plasticity underlying habituation, sensitization and classical conditioning of the Aplysia Californica Gill Siphon withdrawal reflex
… Also included is a brief description of some neural coding schemes. The next chapter explains the basic functioning of synapses and introduces some common forms of synaptic plasticity. This is followed by a discussion of some properties of learning and memory. Note that these chapters are …
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A global framework for scene gist
… aftereffects, thus providing evidence for the neural coding of these properties. Altogether, these results provide support for the hypothesis that rapid categorization of natural scenes may not be mediated primarily though objects and parts, but also through global properties of structure and …
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Time-varying phase relationship between spiking neuronal responses and local field potentials in olfactory processing in manduca sexta
… Oscillatory Model (TOM) seeks to explain neural coding in the first processing center of the invertebrate olfactory system - the antennal lobe - by proposing that activated primary output neurons participate in the encoding ensemble only transiently, based on the coincidence of their …
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Scalable Bundle Design for Massively Parallel Neuronal Recordings <i>In Vivo</i>
Neural coding consists of precise interactions between related neurons. New techniques are needed to measure the time sensitive interactions within entire neural networks to understand how the brain functions. Extracellular recording is the oldest method of measuring neural activity and can sample …
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Development of extracellular electrophysiology methods for scalable neural recording
In order to map the dynamics of neural circuits in mammalian brains, there is a need for tools that can record activity over large volumes of tissue and correctly attribute the recorded signals to the individual neurons that generated them. High-resolution neural activity maps will be critical for …
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Pitch Estimation of Musical Signals
… mechanisms, some support was found for temporal neural coding being the primary, but not singular pitch detection mechanism. A novel method for detecting musical pitch is demonstrated, based on spectrotemporal analysis of the signal. A Fourier analysis algorithm infers perceived pitch from the …
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Models and analysis of a stochastic neural source coder
… (spikes) which are metabolically expensive. A neural coding approach was developed by Johnson et al. (2016) that is optimal, high-fidelity, energy-efficient and well matches the experimental spiking behavior of real neurons. This coder, called a neural source-coder, uses an adaptive threshold …
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Optimizing sensorimotor behaviors through information integration and mental simulation
… integrated optimally. Following this work, the neural mechanism of time reproduction is revealed by analyzing the dynamics of low-dimensional state-space from large-scale electrophysiology recordings. This approach is further applied to uncover mechanisms underlying fear observational learning, …
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Prefrontal coding of naturalistic working memory: Mechanisms during normal maintenance and modelled disease
Neural activity in the primate lateral prefrontal cortex (LPFC) has been causally linked to working memory (WM) — the brief maintenance and mental manipulation of information. Primates use WM to perform tasks in complex contexts; however, neural mechanisms of WM and the pathophysiology related to …
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The Capabilities of Neural Systems Depend on a Hierarchically Structured World
… and computational approach, using artificial neural networks as a high-level quantitative model of basic neuroscientific principles. Neural networks are capable of reasoning by means of a series of specialized distinctions made by individual neurons that are integrated hierarchically. This …
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The Taste of Blood
… in blood and nectar, this unconventional taste coding mechanism confers context-specific information to distinguish between glucose present in blood versus nectar. Together these experiments reveal that specialized stylet neurons innately encode the distinction between blood and nectar at the …
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