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 184 for “"Visual Attention"”.
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The visual attention battery: Predicting flight performance with visual attention tasks
The study investigated differences in attentional abilities between student and instructor pilots. Twenty-four student and thirty-one instructor pilots were administered a battery of attention tasks in an effort to determine whether attentional abilities would covary with the level of piloting …
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A computational model of visual attention.
Visual attention is a process by which the Human Visual System (HVS) selects most important information from a scene. Visual attention models are computational or mathematical models developed to predict this information. The performance of the state-of-the-art visual attention models is limited in …
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Top-down modulation of visual attention
… 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 the …
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Affective influences on top-down visual attention
… emotional processing and the allocation of visual attention share common neural substrates and both draw upon limited top-down resources. Attention is biased towards emotional stimuli and these biases are suggested to be a key mechanism in the development of psychopathology. The aim of this …
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Visual attention shifting in autism spectrum disorder
… spectrum disorders (ASD). Abnormalities in visual attention are particularly notable in ASD and have the potential to inform an understanding of the aberrant neural networks underlying this disorder. The current study utilized a model integrating components of both a two-stage model of …
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PUPIL : constructing the space of visual attention
… level. If we want to understand how humans visually construct a space, then we must examine patterns of visual attention on a physiological level. In order to inquire into patterns of visual attention in three dimensional space, we need to develop new instruments and new methods of …
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The relationship between visual attention and prospective memory
The current study examined the role of attention in prospective memory. Prospective memory refers to the ability to form an intention to do something in the future, such as email a colleague, and additionally remembering to do so at the appropriate moment. Theories of prospective memory retrieval …
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Visual attention in naturalistic scenes across the lifespan.
Visual attentional skills continue to develop through childhood and do not reach maturity until adolescence. On the other end of the spectrum, older adults’ visual attentional skills are declining with age. The development and decline of these skills can lead to difficulties in day to day …
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Working memory, selective visual attention and hierarchical perception
… working memory can guide spatial allocation of attention, even when the stimuli are irrelevant to a subsequent search task. Responses are speeded when the content in working memory matches a target, and are slowed when the content matches a distractor (Downing, 2000; Soto, Heinke, Humphreys, & …
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Effects of Ageing on Visual Attention and Perception
… task. In Experiment 1 the effects of ageing on visual attention and perception were examined using a simple version of the paradigm with one valid and one invalid letter (X versus T). Perceptual cue discrimination and visual orienting at both brief (150 ms) and long (500 ms) stimulus onset …
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Neural and neurochemical mechanisms of sustained visual attention
This thesis investigates the neural basis of attentional control, in the rat, especially in terms of the role of the midbrain dopaminergic systems using behavioural, pharmacological, neuroimaging and neurochemical methods. A visual discrimination task was developed for measuring sustained …
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Visual attention models for far-field scene analysis
… activity in progress. We pose the problem of attention as an unsupervised learning problem, in which the task is to learn from long-term observation a model of the usual pattern of activity. Such a statistical scene model then makes it possible to detect and attend to examples of unusual …
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Investigating priming, inhibition, and individual differences in visual attention
<p>While much has been explored within the attentional control literature, questions still exist as to how attentional processing is modulated, and how different types of visual search paradigms can elucidate the underlying mechanisms involved in successful visual search. Throughout this …
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Visual attention and cognitive biases to threat in anxiety
… theories of anxiety emphasise the importance of attentional processes and propose that anxiety is characterised by selective attention to threat (e.g., Mogg & Bradley, 1998), impaired attentional control (Eysenck, Derakshan, Santos & Calvo, 2007) and/or hypervigilance and enhanced threat …
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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 …
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Modeling the control of visual attention in complex workspaces
Attentional behavior in complex visual workspaces is driven by the physical and temporal characteristics of the display, the goals and knowledge of the operator, and task demands. Accordingly, to develop effective displays, designers must understand how these factors interact to influence …
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VISIT: An efficient computational model of human visual attention
… information and high level processes. For visual processing, researchers have long argued that an attentional mechanism is required to perform many of the tasks required by high level vision. This thesis presents VISIT, a connectionist model of covert visual attention that has been used as …
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