Lee, Yu Heng Daryl; (2024) Learning mechanisms in visual search: Computational and experimental assessments. Doctoral thesis (Ph.D), UCL (University College London).

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Abstract

This thesis investigates the nature of learning mechanisms in visual search, focusing on the debate between multiple-systems and single-system perspectives in the context of contextual cueing. Through a combination of computational modelling of previous data and a series of new experiments, we first demonstrate that apparent dissociations between priming and awareness can be accounted for by a single memory source, without the need to invoke distinct conscious and unconscious processes. Next, this thesis critically assesses the miss-CR contrast approach, a prevalent method in research on unconscious processes, particularly in relation to Kelley’s Paradox and strength skewness. We also explore the widespread use of the miss-CR contrast approach across various disciplines and present empirical evidence challenging its fundamental assumptions. The converging findings support a single-system perspective, indicating that a wide range of phenomena previously attributed to unconscious processes can be parsimoniously explained by a common memory source. The thesis contributes to the understanding of learning mechanisms in visual search and highlights the importance of considering alternative explanations for seemingly unconscious effects in both behavioural and neuroimaging data.

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