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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
21

How memories facilitate perception in the human brain

Patai, Eva Zita January 2012 (has links)
thesis submitted in partial fulfilment of the requirements for the degree of Doctor of Philosophy at the University of Oxford Approximate Word Count: 50,000 After literary scholars, the group of people who most likely cite Marcel Proust are the niche group of psychologists and neuroscientists researching the topic of memory. The incident of the madeleine and Proust's vibrant re-experiencing of 'times past' highlights how important contextual associations are in our lives. The memories we form are often rich in contextual detail, and it is this type of memory which I aim to explore in this thesis. Specifically, I show how memories of contextual nature are formed, and used to guide behaviour. In the General Introduction (Chapter 1), I review the background literature of attention, and the different sources of information that guide it, as well as how contextual information -the associations between iterns-, specifically in natural scenes, can serve as such a source. Next, I describe in detail the literature to date on memory-based signals for attentional guidance. The next chapter summarizes the methodological approaches used in this thesis (Chapter 2). In Chapter 3, I show that long-term memory can optimize perception in complex natural scenes by modulating preparatory attention as well as target processing, using electroencephalography (EEG). In Chapter 4, exploiting the high temporal and spatial resolution of magnetoencephalography (MEG), I explore the neurophysiological markers of encoding, while participants learned contextual associations. In the final experimental chapter (Chapter 5), in a series of experiments I test the low-level mechanisms through which the long-term memory-bias in attentional guidance comes about. In the General Discussion (Chapter 6), I summarize my Findings and incorporate them into the existing literature, and propose outstanding questions.
22

Comparing standardized indirect effects in structural equation modeling.

January 2007 (has links)
Kwan, Lok Yin. / Thesis (M.Phil.)--Chinese University of Hong Kong, 2007. / Includes bibliographical references (leaves 80-83). / Abstracts in English and Chinese. / Chapter CHAPTER ONE: --- INTRODUCTION --- p.1 / The basic mediation model --- p.1 / General approaches in mediation analysis --- p.2 / Resampling methods --- p.8 / Comparing indirect effects --- p.9 / A sequential model fitting method --- p.10 / Current interest of study --- p.13 / Chapter CHAPTER TWO: --- STANDARDIZATION OF PATH COEFFICIENTS --- p.15 / Chapter CHAPTER THREE: --- COMPARING STANDARDIZED INDIRECT EFFECTS --- p.19 / Chapter CHAPTER FOUR: --- REAL EXAMPLES --- p.28 / Chapter CHAPTER FIVE: --- DISCUSSION --- p.55 / Chapter CHAPTER SIX: --- CONCLUSION --- p.57 / APPENDICES --- p.58 / REFERENCES --- p.80
23

THE INFLUENCE OF CONTEXT AND PERCEPTUAL LOAD ON OBJECT RECOGNITION

Unknown Date (has links)
Forster and Lavie (2008) and Lavie, Lin, Zokaei and Thoma (2009) have demonstrated that meaningful stimuli, such as objects, are ignored under conditions of high perceptual load but not low. However, objects are seldom presented without context in the real world. Given that context can reduce the threshold for object recognition (Barenholtz, 2013), is it possible for context to reduce the processing load of objects such that they can be processed under high load? In the first experiment, I attempted to obtain similar findings of the aforementioned studies by replicating their paradigm with photographs of real-world objects. The findings of the experiment suggested that objects can cause distractor interference under high load conditions, but not low load conditions. These findings are opposite of what the perceptual literature suggests (e.g., Lavie, 1995). However, these findings are aligned with a two-stage dilution model of attention in which information is first processed in parallel and then selectively (Wilson, Muroi, and MacLeod, 2011). Experiment 2 assessed if this effect was specific to semantic objects by introducing meaningless, abstract objects. The results suggest that the dilution effect was not due to the semantic features of objects. The third experiment assessed the influence of context on objects under load. The results of the experiment found an elimination of all interference effects in both the high and low load conditions. Comparisons between scene-object congruency revealed no influence of semantic information from scenes. It appears that the presentation of a visual stimuli prior to the flanker task diluted attention such that the distractor effects previously observed in the high load condition were minimized. Thus, it does not appear that context reduced the threshold for object recognition under load. All three experiments have demonstrated strong evidence for the dilution approach of attention over perceptual load models. / Includes bibliography. / Dissertation (Ph.D.)--Florida Atlantic University, 2019. / FAU Electronic Theses and Dissertations Collection
24

Communication and consumer confidence the roles of mass media, interpersonal communication, and local context /

Horner, Lewis R., January 2008 (has links)
Thesis (Ph. D.)--Ohio State University, 2008. / Title from first page of PDF file. Includes bibliographical references (p. 175-192).
25

The hierarchical nature of acquisition of visual specificity in spatial contextual cueing

Lie, Kin-pou. January 2009 (has links)
Thesis (Ph. D.)--University of Hong Kong, 2010. / Includes bibliographical references (leaves 88-101). Also available in print.
26

Women's self-reports on sensitive topics : impact of context / Women's self reports on sensitive topics / Impact of context

Hawkins, Alishea R. January 2005 (has links)
Since Kinsey and his colleagues (Kinsey, Pomeroy, Martin, & Gebhard, 1948; 1953) first began to empirically examine human sexual behavior researchers have found that heterosexual men tend to report having had more sexual partners than heterosexual women. The purpose of the present study was to explore this phenomena using a within subject design. Participants were 124 undergraduate women who completed a packet of surveys on sensitive topics, such as sexuality, and body image, in two conditions: Anonymity Threat Condition: Participants were led to believe that the principle investigator would come in a view their responses while completing the surveys and Bogus Pipeline: Participants were led to believe that they were `hooked-up' to a lie detector. Results found within as well as between subject effects for measures of social desirability and one sexual attitude measure. However, these results did not generalize to the body image measures or sexual behavior questions. / Department of Psychological Science
27

An electrophysiological analysis of semantic context effects on object identification /

Ganis, Giorgio, January 1998 (has links)
Thesis (Ph. D.)--University of California, San Diego, 1998. / Vita. Includes bibliographical references.
28

Contextual influences on parent-child pretend play in a children's museum /

Acosta, Teresa Yvette, January 1997 (has links)
Thesis (Ph. D.)--University of Texas at Austin, 1997. / Vita. Includes bibliographical references (leaves 169-174). Available also in a digital version from Dissertation Abstracts.
29

Influence of temporal context on value : an exploration of various operant conditioning procedures /

O'Daly, Matthew. January 2005 (has links)
Thesis (Ph. D.)--University of California, San Diego, 2005. / Vita. Includes bibliographical references (leaves 56-59).
30

Lexical ambiguity resolution in children frequency and context effects /

Gooding, Christine M. January 2005 (has links)
Thesis (Ph.D.)--Bowling Green State University, 2005. / Document formatted into pages; contains ix, 139 p. Includes bibliographical references.

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