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Title: Perception without awareness : a cognitive neuropsychological investigation of implicit visual information processing in neglected patients and normals
Author: Ellis, Adrian
Awarding Body: University of Aberdeen
Current Institution: University of Aberdeen
Date of Award: 2000
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The thesis investigates the evidence for perception without awareness in both patients and normal individuals. This is examined by considering which types of visual material might be subject to such processing and at what level (perceptual or semantic) the processing appears to occur. The evidence is discussed in relation to working memory and long term memory processes. One previous study which suggested that perception without awareness can occur in neglect patients at a semantic level was the burning house task of Marshall and Halligan (1988). Results from two replications of this study with patients and normals do not unambiguously support this interpretation. Further experiments, employing a repetition priming technique, suggest that meaningful visual material can be processed to a perceptual level in young individuals. However, a comparable task presenting similar, but novel and meaningless, material produced no evidence of such processing in either normal individuals or neglect patients. The results of further experiments employing conceptual priming tasks produced evidence for semantic implicit processing in both neglect patients and normals. The evidence from these experiments is discussed in relation to initial, direct long term memory processing occurring for all incoming information. Results of a further set of experiments, employing proverbs, support this theory and suggest that the strength by which material is represented in long term memory directly affect observed levels of perception without awareness. The data resulting from all these experiments are discussed at length in relation to working memory and long term memory processing.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available