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.
Results
Showing 1 to 20 of 42 for “"receptive fields"”.
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An Analysis of Spatial Summation in the Receptive Fields of Goldfish Retinal Ganglion Cells
… within either the center or the surround of the receptive field of the ganglion cell. A generalized model for this restricted processing is proposed: the independent signals in each of two separately stimulated areas may undergo non-linear transformation; the two areas may interact at one or …
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Somatosensory processing by rat medial pontomedullary reticular formation neurones : responses to innocuous and noxious thermal and mechanical stimuli
… responses to cutaneous mechanical stimuli and receptive field properties, and spontaneous discharge characteristics. Ramp, step and sine wave cutaneous thermal stimuli (35-48 °C) were applied to the glabrous skin on the hindpaw by means of a computer-controlled Peltier device. The location of …
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A Modular Computational Framework for Integrating Motion and Chromatic Representations in Mice Retina
… sensitivity is described through spatiotemporal receptive fields, while chromatic sensitivity is summarized using temporal response kernels. This work addresses the challenge of combining these heterogeneous representations into a unified and interpretable computational system. The proposed …
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Investigating The Neural Basis of Audiovisual Speech Perception With Intracranial Recordings In Humans
… higher region. To test this, I first mapped the receptive fields of different regions in the visual cortex and then measured their responses to visual (silent) and audiovisual speech stimuli. I found that visual regions that have central receptive fields show greater response enhancement to …
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Pontomedullary reticular formation neurones : a study of microanatomy, transmitter sensitivity and connections from the substantia nigra pars reticulata
… discharge, polymodal sensory responses and large receptive fields.
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Case Studies in Invertebrate Visual Processing: I. Spectral and Spatial Processing in the Early Visual System of Drosophila melanogaster II. Binocular Stereopsis in Sepia officinalis
… responses, intensity-response relationships, and receptive fields of neurons in the early visual system of a variety of genetically modified strains of Drosophila. Specifically, I compared visual responses in the medulla of flies expressing either a subset or all photoreceptor opsins, with …
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Functional Dynamics of Primate Retinal Ganglion Cells
… and the functional organization of the cells' receptive fields. Previously tried methods as well as a new method described here were used to study the interactions of contrast signals within the receptive fields of M and P cells. The first-order responses of P cells to spots and annuli isolated …
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A wavelet-based CMAC for enhanced multidimensional learning
… is determined largely by the choice of the receptive field shape and the generalization parameter. This research contains a rigorous analysis of the rate of convergence with the standard CMAC, as well as the rate of convergence of networks using other receptive field shape. The effects of …
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Morphogenesis of the lateral geniculate nucleus in primates
… cause a wave of development of neuronal receptive fields to propagate through the nucleus and establish two distinct lamination patterns. Analysis of the underlying dynamics helps understand the mechanism of propagation of the developmental wave, as well as the mechanism which allows a …
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Neural Processing in the Three Layer Turtle Visual Cortex
… properties, we explore spatial properties of receptive fields, temporal properties of spontaneous and evoked activity, response adaptation, and correlations between different types of activity as well as between activity recorded in different regions.To study the roles of rhythmic oscillations …
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Neural prosthetics for paralysis : algorithms and low-power analog architectures for decoding neural signals
… of neurons adapt the configurations of their receptive fields in response to new stimuli, learn to encode the structure of new parameter spaces, and ultimately retrace trajectories through such spaces in the absence of the original stimuli.
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Methods toward improved lower extremity rehabilitation
… units and allows characterization of the neural receptive fields associated with gait phase and loading force. Understanding how these receptive fields change during training and with experience will be central to developing rehabilitation strategies that optimize motor adaptations and motor …
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Encoding of periodic skin stimuli by spinal dorsal horn neurons
… which is known to process low threshold mechanoreceptive input. The studies presented here were designed to assess the possible role of the dorsal horn in the encoding of vibrotactile pitch. To accomplish this task, dorsal horn single unit extracellular recordings were obtained during periodic …
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Neural computation of depth from binocular disparity
… These networks develop physiologically plausible receptive fields, and predict neural responses to highly unnatural stimuli commonly used in the laboratory. They do not necessarily relate to our experience of depth, but seem to act as a bottleneck for depth perception. Conversely, neural activity …
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Mechanisms of thermal sensitivity in rodent primary afferent neurons innervating the skin
… and mustard oil were then applied onto the receptive field of primary afferents to determine the expression pattern of thermosensitive TRP channels. The majority of cold sensitive A and C fibre nociceptors as well as thermoreceptors were sensitive to menthol, indicating that TRPM8 is the …
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Thermoreception, thermoregulation and the early thermal environment
… of processing of thermal information (thermoreceptive, early integrative and effector levels). The present study confirmed the impaired capacity of heat-reared rats to maintain colonic temperature in the cold and future indicated that this was likely to be attributable to active rather than …
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Mnemonic information in the rodent hippocampus during wake and sleep states
… of space, as mediated by the spatial receptive fields, or place fields, of hippocampal pyramidal neurons. We show that there is a bias in both place field distribution and population spiking activity towards previously reinforced locations; restriction of analysis to periods of uniform …
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The role of cortical layer six in the perception and laminar representation of sensory change
… dependent change signals with heterogeneous receptive fields. Corticothalamic (CT) cells in Layer 6 respond sparsely, but faithfully encode stimulus identity. Weak optogenetic drive of L6 CT cells disrupted this encoding in layer 6 without affecting overall firing rates. This manipulation …
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Neural basis of a visuo-motor transformation in the fly
… system. In chapter two, I report that the visual receptive fields of Neck Motor Neurons are similar to those of the TCs. Using this result, I show an alignment between the coordinate systems used by the visual and the neck motor systems to process visual information. Thus, TCs encode visual inputs …
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Combinatorial analysis of sequential firing patterns across multiple neurons decoding memory of sequential spatial experience in rat hippocampus
… to repeatedly run through a sequence of spatial receptive fields ("place fields") of hippocampal CA1 "place cells" in a fixed temporal order. The spiking activity of many such individual cells is recorded before (PRE), during (RUN), and after (POST) this experience. By treating each place field …
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