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Essay / Research Paper Abstract
This 5 page paper is a review of an article entitled "Perception of Geometric Illusions in Hemispatial Neglect" by Tony Ro and Robert Rafal. The authors tested one patient using Muller-Lyer and Judd illusions to determine if geometric illusions are processed preattentively. Bibliography lists 1 source.
Page Count:
5 pages (~225 words per page)
File: MM12_PGpratn.rtf
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Unformatted sample text from the term paper:
errors were the result of perceptual neglect as opposed to any kind of motoric bias. The authors observed one patient who met the criteria, which meant the patient had no
explicit awareness of the left side of the illusion figure. The patient was a 59-year old woman who had had a stroke six weeks prior to the observation. As an
aside, preattentive means a person perceives something without being consciously aware of perceiving it, whatever it is. There is a limited number of visual properties that a human can detect
quickly and accurately through a very low-level visual system all humans possess. Therefore, pre-attentive is before (pre) conscious awareness (attentive). When quickly or rapidly is used, the measure is in
milliseconds. So, the investigators are really testing which properties of the geometric stimuli, e.g., Judd illusion figures. Some of the features that have typically been associated with preattentive processing include
color, shape, length, size, and line orientation. The investigators used geometric illustrations with same-different two alternative forced choice method. They measured the patients performance on Judd and Muller-Lye illusion figures.
This means they presented the patient with instructions to determine if two figures were the same or different. The forced-choice description means the patient had to make a decision between
two illustrations as to whether they were the same thing or different. The patient was able to detect a finger that was wiggling or an object that was on her
left side but only when there was no competing stimuli on the right side. As soon as another object was presented on the right side, she was unaware of an
object on the left side. Because the patient was able to detect an object on the left side but that awareness was canceled or eliminated as soon as an object
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