Visual illusions and other individual differences: indicators of a natural colonoscopist?

Holland, Catherine (2012). Visual illusions and other individual differences: indicators of a natural colonoscopist? Honours Thesis, School of Psychology, The University of Queensland.

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Author Holland, Catherine
Thesis Title Visual illusions and other individual differences: indicators of a natural colonoscopist?
School, Centre or Institute School of Psychology
Institution The University of Queensland
Publication date 2012-10-10
Thesis type Honours Thesis
Supervisor Marcus Watson
Total pages 75
Language eng
Subjects 1701 Psychology
Abstract/Summary Colonoscopy is an important tool used to prevent colorectal cancer through the detection and removal of precancerous polyps. Past research has revealed large variability in colonoscopists’ ability to detect polyps during this procedure. Furthermore, novices’ polyp recognition skill has been found to vary substantially, suggesting there are individual differences that make some people naturally better at finding polyps over others. The current study aimed to identify potential cognitive and perceptual factors influencing these individual differences. It was hypothesised that superior polyp recognition skill (as measured by ability to identify polyps, as well as ability to discriminate between polyp and non-polyp images) would be related to higher contrast sensitivity, greater visual illusion perceptual ability (as measured by Ambiguous Figures, Hidden Figures, and Visual Search Figures illusions), and lower dysfunctional impulsivity. Furthermore, it was predicted that higher functional impulsivity would be related to faster identification of polyps, rather than polyp recognition skill. A sample of 83 student novices completed a Polyp Recognition Test, as well as measures of the theorised variables. Substantial variance was found in novices’ polyp recognition skill; replicating previous research. The hypotheses were partially supported; such that higher polyp detection rates were associated with greater ability to perceive Visual Search Figures illusions, and greater ability to discriminate between polyp and non-polyp images was predicted by higher scores on Hidden Figures illusions. Unexpectedly, a positive correlation was found between functional impulsivity and both measures of polyp recognition skill rather than polyp response time. Contrary to hypotheses, contrast sensitivity and dysfunctional impulsivity were not related to either measures of polyp recognition skill. Although the hypotheses were partially supported all correlations were weak; consequently, the results are discussed in terms of the study design and directions of future research.
Keyword Visual illusions
Indicators of a natural colonoscopist

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Created: Fri, 01 Mar 2013, 14:17:31 EST by Mrs Ann Lee on behalf of School of Psychology