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 13 of 13 for “"sensory adaptation"”.
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Sensory Adaptation and Chemotaxis in Bacillus Subtilis
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1983.
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Mechanisms of Sensory Adaptation in the Primate Visual System
… the mechanisms by which the brain adapts to the sensory signals that it encounters in the natural environment. We found that the processes underlying motion perception in ecological vision are mediated by an adaptive center-surround mechanism that trade-offs spatiotemporal resolution for signal …
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A Mechanism for Spatial Orientation Based on Sensory Adaptation in Caenorhabditis Elegans
… A behavioral analysis demonstrated that AWA sensory neurons drive chemotaxis over several orders of magnitude in odor concentration, providing an entry point for dissecting the mechanistic basis of chemotaxis at the level of neural activity. Precise microfluidic stimulation enabled me to …
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Evolution and functional specializations in nocturnal environments: insights from visual pigments in Chiroptera
Sensory systems act as a direct interface between organisms and their environment, constituting an ideal model to investigate how diverse evolutionary pressures shaped sensory adaptation. At the molecular level, vision is initiated through activation of visual pigments, light-sensitive complexes …
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Contributions of distinct interneuron types to neocortical dynamics
… of PV and SOM neurons in dynamic regulation of sensory processing. First, by combining extra- and intracellular recordings with optogenetic and sensory stimulation and pharmacology, we have shown that PV cells play a key role in the generation of neocortical gamma oscillations, confirming the …
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Functional aspects of blur adaptation in human vision. A study of the mechanism of blur adaptation in human vision - its origin and scope evidenced using subjective and objective procedures.
Sensory adaptation to blur improves visual acuity under defocused conditions. This phenomenon has been successfully demonstrated using subjective measures of acuity and is known as blur adaptation. This study investigates aspects of the mechanism of blur adaptation in human vision using subjective …
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Quantifying uncertainty in computational neuroscience with Bayesian statistical inference
… and modeling how neurons and networks process sensory information in order to represent the environment. In both of these endeavors, it is crucial to understand and quantify uncertainty - when describing how the brain itself draws conclusions about the physical world, and when the experimenter …
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Adaptive modality selection for navigation systems
… tasks, the combination can easily result in sensory or attentional overload and lead to major reductions in performance. Since the tasks that these people must perform often require intense visual attention, such as scanning an area for threats or targets, conventional visual navigation …
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Sensory representations optimized for the natural environment
… can impact and determine perceptual behavior and sensory representation in both biological and artificial systems. In Chapter 1, I provide a brief review of the theory of efficient coding, models of natural image statistics, and the interplay between these two fields. In Chapter 2, based on a …
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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)
… and/or detect deviations from established sensory patterns. Clinical 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 …
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Mechanical Control of Sensory Hair-Bundle Function
… organs in which they are situated. As the mechanosensory function of a hair bundle varies, so too do the mechanical properties of the bundle and its microenvironment. Hair bundles range in height from 1 μm to 100 μm and in stiffness from 100 μN/m to 10,000 μN/m. They are composed of actin-filled, …
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Neural Circuit Dependence of Acute and Subacute Nociception in C. Elegans
… Both neural circuits feature a direct path from sensory neurons to motor neurons that is connected by a single class of interneuron, bypassing the higher processing centers. Both neural circuits also feature higher processing pathways that receive information from sensory neurons and provide …
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Similarities and variations of the enterobacterial chemotaxis paradigm in Sinorhizobium meliloti
… pentapeptide-bearing receptors and the adaptation proteins that they tether in E. coli and S. meliloti. The stoichiometry data show that the ratio of pentapeptide-bearing chemoreceptors to chemotaxis protein (Che)R and CheB molecules are approximately 500- and 160-fold higher in S. …