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 10 of 10 for “"top-down modulation"”.
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Top-down modulation of visual attention
This body of work examines the effects of pre-cues on visual search for targets defined by a colour-orientation conjunction. Cueing the identity of targets enhanced the efficiency of search, with stronger effects from cueing the colour of the target compared to cueing its orientation, even though …
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Top-down Modulation of the Chromatic VEP with Hypnotic Suggestion
… composed of both bottom-up (stimulus driven) and top-down (feedback) processes. It has been demonstrated that directed spatial attention enhances processing of attended stimuli, inhibits non-attended stimuli, and increases baseline activity in portions of cortex corresponding to attended areas of …
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ERP correlates of the interactions between top-down and bottom-up processes in visual object categorization
… as amplitude spectrum and spatial frequency) and top-down processes (the categorization task that the participants perform) interact and modulate the visual ERPs. We found ERP correlates of categorical representation for animal and inanimate object categories, as well as early, task-related …
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Die Beeinflussung der zentralen Schmerzverarbeitung beim Menschen durch konkurrierende Aufmerksamkeitsleistung mit einer Stroop-Aufgabe
… von Hirnstrukturen, die für eine dämpfende Modulation und Regulation nociceptiver Signale bedeutsam sind. Auf neuronaler Ebene drückte sich die reduzierte Schmerzwahrnehmung einerseits in einer verminderten Aktivierung sensorisch und affektiv verarbeitender Hirnregionen aus, andererseits in …
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BRAIN MECHANISMS SUPPORTING EXPECTATION AND TOP-DOWN ATTENTION TO PAINFUL STIMULI
Top-down influences such as expectation and attention may powerfully modulate both sensory experience and related processing in the brain. In pain, top-down information such as expectations of lower pain or placebo treatments significantly reduces both subjective reports of experienced pain and …
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Using electrical stimulation for sensory restoration and modulation of attention
… sensors to central neural circuits) and top-down modulation (in which attention and prior knowledge shape perceptual interpretation). For those suffering from sensory loss, electrical stimulation through auditory and visual prosthetics can be used to restore sensory abilities. In …
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Connectional heterogeneity in the mouse auditory corticocollicular system
This Dissertation was approved for publication on 2019-04-18 at 12:55.
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Top-Down Control of Lateral Interactions in Visual Cortex
… features (Li et al. 2004). We hypothesized that top-down modulation of effective connectivity within V1 underlies the behaviorally dependent modulations of contextual interactions in V1. To test this idea, we used a chronically implanted multi-electrode array in awake primates and studied the …
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Investigating The Neural Basis of Audiovisual Speech Perception With Intracranial Recordings In Humans
… whether this response enhancement is a result of top-down modulation from a 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 …
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Cells that Kill: The Chemosensory Cell Types of Aedes aegypti Mosquitoes
… these sensory neurons are subject to local or top-down modulation that drives context- and state-relevant behaviors. We are now expanding on this work with the Mosquito Cell Atlas project, a large-scale snRNA-seq project of essentially every tissue from the adult Aedes aegypti mosquito. Many …