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Thesis (Ph. D.)--Ohio State University, 2009. / Title from first page of PDF file. Includes vita. Includes bibliographical references (p. 170-179).

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Visual processing is not fixed, but changes dynamically depending on the spatiotemporal context of the presented stimulus, and the behavioural task being performed. In this thesis, I describe theoretical and experimental work that was conducted to investigate how and why visual perception and neural responses are altered by the behavioural and statistical context of presented stimuli. The process by which stimulus expectations are acquired and then shape our sensory experiences is not well understood. To investigate this, I conducted a psychophysics experiment where participants were asked to estimate the direction of motion of presented stimuli, with some directions presented more frequently than others. I found that participants quickly developed expectations for the most frequently presented directions and that this altered their perception of new stimuli, inducing biases in the perceived motion direction as well as visual hallucinations in the absence of a stimulus. These biases were well explained by a model that accounted for their behaviour using a Bayesian strategy, combining a learned prior of the stimulus statistics with their sensory evidence using Bayes’ rule. Altering the behavioural context of presented stimuli results in diverse changes to visual neuron responses, including alterations in receptive field structure and firing rates. While these changes are often thought to reflect optimization towards the behavioural task, what exactly is being optimized and why different tasks produce such varying effects is unknown. To account for the effects of a behavioural task on visual neuron responses, I extend previous Bayesian models of visual processing, hypothesizing that the brain learns an internal model that predicts how both the sensory input and the reward received for performing different actions are determined by a common set of explanatory causes. Short-term changes in visual neural responses would thus reflect optimization of this internal model to deal with changes in the sensory environment (stimulus statistics) and behavioural demands (reward statistics), respectively. This framework is used to predict a range of experimentally observed effects of goal-orientated attention on visual neuron responses. Together, these studies provide new insight into how and why sensory processing adapts in response to changes in the environment. The experimental results support the idea of a very plastic visual system, in which prior knowledge is rapidly acquired and used to shape perception. The theoretical work extends previous Bayesian models of sensory processing, to understand how visual neural responses are altered by the behavioural context of presetned stimuli. Finally, these studies provide a unified description of ‘expectations’ and ‘goal-orientated attention’, as corresponding to continuous adaptation of an internal generative model of the world to account for newly received contextual information.

Call number: LD2668 .T4 1957 D52 / Master of Science

Wong Ka Chat Andrew. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2005. / Includes bibliographical references (leaves 72-79). / Abstracts in English and Chinese. / ABSTRACT (ENGLISH) --- p.i / ABSTRACT (CHINESE) --- p.iii / TABLE OF CONTENTS --- p.iv / LIST OF TABLES --- p.vii / LIST OF FIGURES --- p.viii / Chapter CHAPTER ONE --- INTRODUCTION --- p.1 / Chapter 1.1 --- Background --- p.1 / Chapter 1.2 --- Research Objectives --- p.4 / Chapter 1.2.1 --- To incorporate affective expectation theory into satisfaction research --- p.4 / Chapter 1.2.2 --- To distinguish the differential satisfaction responses elicited by affective and cognitive expectations --- p.4 / Chapter 1.2.3 --- To propose the theory that expectation bases predetermine evaluation modes --- p.5 / Chapter CHAPTER TWO --- CONCEPTUAL FRAMEWORK --- p.6 / Chapter 2.1 --- Affective and Cognitive Expectations --- p.6 / Chapter 2.1.1 --- Definitions --- p.6 / Chapter 2.1.2 --- The Assimilation Effects of Affective Expectation --- p.7 / Chapter 2.1.3 --- Different Satisfaction Responses Evoked by Different Expectation Bases --- p.9 / Chapter 2.1.4 --- Hypothesis 1 --- p.10 / Chapter 2.2 --- The Predetermination of Evaluation Mode --- p.11 / Chapter 2.2.1 --- Affective and Cognitive Evaluation Modes --- p.12 / Chapter 2.2.2 --- The Theory of Predetermination of Evaluation Modes --- p.14 / Chapter 2.2.3 --- Hypothesis 2 --- p.14 / Chapter CHAPTER THREE --- RESEARCH METHODOLOGY --- p.15 / Chapter 3.1 --- Pretest --- p.15 / Chapter 3.1.1 --- Pretest 1: Affective quality manipulation --- p.16 / Chapter 3.1.2 --- Pretest 2: Cognitive quality of the CD --- p.18 / Chapter 3.1.3 --- Pretest 3: Expectation manipulations --- p.19 / Chapter 3.2 --- Main Study --- p.23 / Chapter 3.2.1 --- Participants and Design --- p.23 / Chapter 3.2.2 --- Procedure --- p.24 / Chapter 3.2.3 --- Measures --- p.26 / Chapter CHAPTER FOUR --- RESULTS --- p.28 / Chapter 4.1 --- Demand and Manipulation Checks --- p.28 / Chapter 4.2 --- Hypotheses Testing --- p.30 / Chapter 4.2.1 --- Differential Effect of Affective and Cognitive Expectations on Satisfaction --- p.30 / Chapter 4.2.2 --- The Predetermination of Evaluation Modes --- p.37 / Chapter 4.2.2.1 --- Total Number of Thoughts --- p.38 / Chapter 4.2.2.2 --- Proportion of Affective Thoughts --- p.38 / Chapter 4.2.2.3 --- Proportion of Cognitive Thoughts --- p.40 / Chapter 4.2.2.4 --- Proportional of Comparative Thoughts --- p.42 / Chapter 4.2.2.5 --- Proportion of Positive Thoughts --- p.45 / Chapter 4.2.2.6 --- Proportion of Negative Thoughts --- p.49 / Chapter 4.2.2.7 --- Proportion of Visual Thoughts --- p.54 / Chapter CHAPTER FIVE --- DISCUSSION --- p.56 / Chapter 5.1 --- Theoretical Contribution --- p.56 / Chapter 5.2 --- Limitations and Research Opportunities --- p.61 / APPENDIX 1 MOCK UP MAGAZINE EXCERPT --- p.64 / Chapter 1A --- Cognitive Version --- p.64 / Chapter 1B --- Affective Version --- p.65 / APPENDIX 2 COMMENTS ON THE CD CLAIMED TO BE WRITTEN BY PREVIOUS PARTICIPANTS --- p.66 / Chapter 2A --- Cognitive Version --- p.66 / Chapter 2B --- Affective Version --- p.67 / APPENDIX 3 EXAMPLES OF LISTED THOUGHTS CODED AS AFFECTIVE --- p.68 / Chapter 3A --- Positive --- p.68 / Chapter 3B --- Negative --- p.68 / APPENDIX 4 EXAMPLES OF LISTED THOUGHTS CODED AS COGNITIVE. . --- p.69 / Chapter 4A --- Positive --- p.69 / Chapter 4B --- Negative --- p.69 / APPENDIX 5 EXAMPLES OF LISTED THOUGHTS CODED AS COMPARISON --- p.70 / APPENDIX 6 examples of listed thoughts coded as visual --- p.71 / References

Thesis (Ph. D.)--York University, 1998. Graduate Programme in Psychology. / Typescript. Includes bibliographical references (leaves 168-188). Also available on the Internet. MODE OF ACCESS via web browser by entering the following URL: http://wwwlib.umi.com/cr/yorku/fullcit?pNQ27304.

Thesis--PlanB (M.S.)--University of Wisconsin--Stout, 2001. / Includes bibliographical references.