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 16 of 16 for “"evidence accumulation"”.
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Neural Dynamics of Goal-Directed Action Selection: A Multivariate Approach to Evidence Accumulation and Cognitive Control in Response to Competing Stimuli
… to and motivation for the thesis, exploring the evidence accumulation framework as a tool to understand the latent cognitive processes involved in adaptive action-selection, and exploring the phenomenon of conflict resolution through the lens of the Stroop task. In Chapter 2, I asked how …
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Systematic variability in stage-one processing as revealed by eye movements in efficient visual search
… characterized by a parallel, capacity-unlimited evidence accumulation process that is affected by both lure-target similarity (due to resolution limits of the eye) as well as the number of items on the display (due to the exhaustive nature of evidence accumulation). Here, we examined eye …
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The parallel nature of early visual processing in visual search
… the distractors. However, there has been recent evidence that systematic variability exists even inefficient search. This led to the development of the Target Contrast Signal Theory, which proposed a different mechanism for parallel processing in visual search. In contrast to the pre-attentive …
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ERP correlates of the interactions between top-down and bottom-up processes in visual object categorization
… are interpreted within the framework of flexible evidence accumulation processes.
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Mechanisms of Value-Biased Prioritization in Fast Sensorimotor Decision Making
… in the common situation where physical evidence is strong but the time to act is severely limited. This research examines the behavioral and electrophysiological indices of how value biases split-second perceptual decisions and the possible mechanisms underlying the process. In prominent …
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Decision-making in the primate brain : formation, location, and causal manipulation
… relies on the ability to accumulate sensory evidence in favor of a decision. Despite the paramount importance of decision-making to survival, the neural instantiations and computational principles governing the process have remained elusive. In this thesis I consider how sensory evidence is …
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Investigating the contribution of parallel processing to visual search performance according to the Target Contrast Signal Theory
… parallel processing in early vision involves evidence accumulation about how likely a given location is to contain the target in effort to reject items from further processing. The experiments presented and proposed in this thesis further our knowledge and understanding about this early …
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How trial correlations and feedback shape sequential decision-making
… on sequences of independent trials in which the evidence gathered to make a choice, as well as the resulting actions and feedback, are irrelevant to future decisions. Two-alternative forced choice tasks (2AFC) are often used to characterize strategies subjects use to make decisions. Normative …
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Slipping into Sleep: neurodynamics of alertness transitions in humans and fruit flies
… diffusion model (HDDM) show how drift-rate (evidence accumulation) explains errors. Then, I show convergent evidence in the neural dynamics using multivariate pattern analysis (MVPA). Next, I probe the effect of handedness on the same task. Handedness affects behaviour only under drowsy …
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Acting on Behaviorally Relevant Events and the Impact this has on Attention & Memory
… reveal that the impact on memory is primarily on evidence accumulation. In the latter two empirical articles, I investigate what the neural origins of this phenomenon may be. Its underpinnings must involve a mechanism that is triggered by decision processes related to the appearance of …
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Computational Study of Multisensory Gaze-Shift Planning
… from a common source (chapter 2). We propose an evidence-accumulation decision-making framework, and introduce a spatiotemporal similarity measure as the criterion to choose to integrate the multimodal information or not. The variability of report of sameness, observed in experiments, is …
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Investing in Clinical Trials for Older Adults: The Value and Challenges of Older Adult-Specific Clinical Trials
… of older adults and the lack of clinical evidence for them. Examining the challenges and the value of such trials could facilitate discussion among trial sponsors on the investment in and the prioritization of older adult-specific trials. This dissertation examines the risk of failure and …
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Decision making in the absence of conscious awareness
… results are best explained by the continued accumulation of information from a decaying sensory memory trace. In Chapter 3, we investigate the controversial idea that unconsciously processed information can modulate decision accuracy. Using a novel dichoptic suppression paradigm to titrate …
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A midbrain mechanism for computing escape decisions in the mouse
… and assesses sensory stimuli of varying threat evidence during exploration, choosing whether to escape to a shelter, or not. The performance data in this task were best formalised with a drift-diffusion model of decision making, providing a framework to understand innate behavioural tasks in …
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Behavioural principles underlying navigational decision-making in Drosophila melanogaster larvae
… of side-to-side comparison and possible sensory evidence accumulation that facilitates improved decision-making. In this thesis, I introduce the construction and implementation of two computational models for comparison to the larval behaviour trajectories. Both models reflect features of the …
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Dynamics of human decision-making : vestibular perception and neural correlates
… consistent with both signal detection theory and evidence accumulation, respectively. Specifically, the computational simulations showed that the unbounded evidence accumulator model fits the confidence data better than the classical bounded model while bounded and unbounded models were …