mcgurk essay - Andrew Gaddis Analysis and Summary:...

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Andrew Gaddis Psycholinguistics Analysis and Summary: “Effects of Sentence Context and Expectation on the McGurk Illusion” by Sabine Windmann The 2003 study by Sabine Windmann entitled “Effects of sentence context and expectation on the McGurk illusion” sets out to explore the previously held belief that the McGurk illusion is consistently resistant to cognitive alteration (an “all or none” effect). Drawing upon scores previous studies in which the perception of ambiguous phonemes Clifton, 1987; Ganong, 1980; Lucas, 1999; Newman, Sawusch, & Luce, 1997; Pitt & Samuel, 1993; Samuel, 1981, 1991, 1997, 2001; Samuel & Pitt, 2003), the first in a series of experiment is set up to test the effects of expectations caused by semantic context. The illusion’s probability of occurrence and perceived clarity are recorded for both semantically congruent and incongruent words. To increase the validity of the results, all of the chosen words appear in both “congruent” and “incongruent” sentence contexts. This procedure is done for two categories: a “prediction” condition in which the McGurk word completes a sentence, and a “priming” condition in which the McGurk word is associated with a complete sentence. Windmann predicts that in the case of illusion modification, the effects of congruency will be greater in the “prediction” category than in the “priming” category. Contrary to all previous literature and in accordance with Windmann’s expectation, the results show that the McGurk illusion is modified significantly by the experimental manipulations, becoming more probable for the semantically congruent
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word groups in the “prediction” category (the probability difference in the “priming” category is not statistically significant). It is also found that a single subject will change their report of the illusion’s success for identical percepts, based on whether or not they are congruent or incongruent in context. These results clearly indicate that the illusion is susceptible to alteration by cognitive processing, and therefore follows pathways less similar to other truly autonomous illusions (mostly visual) (Eagleman, 2001) and more similar to the above mentioned ambiguous phonemes. However, the specific factor that
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This note was uploaded on 04/07/2008 for the course COGSCI 300 taught by Professor Badecker during the Fall '08 term at Johns Hopkins.

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mcgurk essay - Andrew Gaddis Analysis and Summary:...

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