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 15 of 15 for “"Top-Down Attention"”.
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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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Pre-Saccadic Modulation of the Visually Evoked Potential
… eye movement is made. It is believed that covert attention allotted to the intended destination of a saccade, called pre-saccadic attention, accounts for the improved discrimination of stimuli. Covert top-down attention, which consists of orienting your attention, and not your gaze, to an object …
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The Effect of C-Section Birth on Attention Task Performance and Cortical Grey Matter Integrity
… is a factor in reduced performance on visual attention tasks, as well as altered intrinsic functional neural networks, for both infants and adults born via C-section. The present study tested C-section and vaginally born adults on six tasks: a visual search task, the Attention Network Task, …
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Time Course of Regional Brain Activity Associated With Top-Down Attentional Control in Depression
… different roles in this network involved in top-down attention control.
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THE RELATIONSHIP BETWEEN P300 EVOKED POTENTIALS AND PREFRONTAL CORTEX OXYGEN USE: A COMBINED EEG AND NIRS STUDY
… suggest that the right medial PFC is involved in attention to salient stimulus features (bottom-up attention) and the lateral PFC is involved in sustained attention to the task (top-down attention). Thus, P3b attenuation is reflective of delimiting attention to salient features and allowing task …
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Non-Target Emotional Stimuli Must Be Highly Conspicuous in Order to Break through the Attentional Blink
In the attentional blink (AB), the second of two targets (T2) separated by a short lag in a rapid serial visual presentation (RSVP) stream is difficult to report. The AB is typically thought of as a top-down effect because it is triggered when the first target (T1) matches a search template. …
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Semantic and phonological context effects in visual search
… According to theories of visual search, attention is directed towards the target through a combination of stimulus-driven (bottom-up) and goal-driven (top-down) means. For example, when searching for a red car, top-down attention can prepare the visual system to prioritise items with …
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Deep Attentional Modulation for Zero-shot Learning in Object Recognition
In the human brain, top-down attention plays a crucial role in the human ability to recognize seemingly infinite visual concepts using the same visual pathway. Even more impressive, humans have the ability to recognize objects from just a description (zero-shot) or a few examples (few-shot). …
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Comparison of frontal and parietal cortices in the control of visual attention
… and, more importantly, our ability to switch our attention from object to object, that supports complex cognitive behavior. Therefore, by understanding the neural mechanisms involved in directing attention we hope to better understand cognition. Previous work investigating the ability to control …
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The neural and psychophysical bases of memorability
… phenomena shown to influence memory - bottom-up attention, top-down attention, and priming - and find that memorability effects remain independent of these phenomena (Chapter 4). Lastly, I investigate the neural correlates of memorability in a human functional magnetic resonance imaging …
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The Effects of Nicotine on Attention Orienting
… Under conditions of processing conflict, attention and cognitive control processes bias sensory input based on internal goals. These processes are supported by the interplay of a fronto-parietal attention network that exerts a top-down influence on information processing and a superior …
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The Role of the Posterior Parietal Cortex in Subjective and Objective Episodic Memory Recollection
The purpose of this project was to compare the Attention to Memory (AtoM) and the Episodic Buffer (EB) Models. The AtoM model proposes that the ventral parietal cortex (VPC) and dorsal parietal cortex (DPC) are responsive to bottom-up and top- down attention to memory, respectively, (Cabeza, 2008; …
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Visual saliency computation for image analysis
… model by leveraging synthetic images. 5) Top-down Saliency Detection. Unlike the aforementioned tasks, top-down saliency detection entails generating task-specific saliency maps. We propose a weakly supervised top-down saliency detection approach by modeling the top-down attention of a CNN …
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Is it top-down or bottom-up? an evaluation of processes involved in salience and decision making utilising eye-tracking consumer neuroscience research
… capacity results in insufficient allocation of attention. This can be seen in terms of product advertising as well as packaging including labelling. Bottom-up and top-down visual attention processing, as well as visual saliency, are measured and analysed in neuromarketing research to aid …
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Visual attention in primates and for machines - neuronal mechanisms
Visual attention is an important cognitive concept for the daily life of humans, but still not fully understood. Due to this, it is also rarely utilized in computer vision systems. However, understanding visual attention is challenging as it has many and seemingly-different aspects, both at …