Thesis (M.A.) - Simon Fraser University, 2005. / Theses (Dept. of Psychology) / Simon Fraser University. Also issued in digital format and available on the World Wide Web.

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This study investigated the hypothesis that bilateral stimulation of the cortex would facil_tate the performance of a letter matching task as compared to unilateral stimulation.Furthermore, the study expected to observe a RVH superiority for a NI letter match and a LVH superiority for making a PI letter match as observed in an earlier study (Cohen, 1972). These results were not found. The only conclusive result found was that the NI letter match was a more difficult match to make than any of .he other letter matches. Possible sources for this factcr were discussed.

The present study was designed to investigate the relationship of inferred hemisphericity for spatial and verbal processing in normal and dyslexic male readers using a dichotomous tactile stimulation technique. The study was a modification of Witelson's (1974; 1976) studies using non-verbal (shapes) and verbal (letters) stimuli. An additional verbal (objects) task, in which subjects recognized and verbally reported the object's use, was devised specifically for the study.One purpose of the study was to determine whether older normal readers would differ from dyslexics of the same age and younger normal readers on their accuracy of recognition of stimuli. Another purpose was to examine the differences between left and right hand responses to the verbal tasks (letters and objects) to determine if the objects task was a better measure of verbal or left hemispheric functioning than the letters task.Subjects were right-handed males who demonstrated average or above average intelligence and manifested no sensory impairment or primary emotional disturbance. Older normal readers and dyslexics were 9 to 13 years while younger normal readers were 5 to 7 years old. A total of 66 subjects qualified for and completed the study.Analysis of variance was employed to test the main hypothesis using a three-factor design with repeated measures on the same subjects (Winer, 1971). No differences were found in the accuracy of response among groups suggesting greater within than between group variance. A significant Task x Hand interaction (P/-.05) was explained by greater inferred right hemisphere involvement in the processing of the shapes and letters tasks while greater inferred left hemisphere involvement in the processing of the objects task was confirmed for the normal groups. Dyslexics, however; demonstrated more inferred right hemisphere involvement for all the tasks (shapes, letters and objects) suggesting the use of a spatial-holistic cognitive strategy for stimuli whether non-verbal or verbal.

Thesis (B.A.(Hons.))-- University of Adelaide, Dept. of Psychology, 1977.

Thesis (Ph. D.)--University of Wisconsin--Madison, 1982. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 78-88).

Thesis (M.S.)--Virginia Polytechnic Institute and State University, 1992. / Vita. Abstract. Includes bibliographical references (leaves 51-57). Also available via the Internet.

Thesis (M.S.)--University of Wisconsin--Madison. / Typescript. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 50-54).