HEMISPHERIC ASYMMETRY IN VISUO-SPATIAL PROCESSING: DIFFERENTIAL EFFECTS ON REACTION TIME, ACCURACY AND SIGNAL DETECTION.
Item
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Title
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HEMISPHERIC ASYMMETRY IN VISUO-SPATIAL PROCESSING: DIFFERENTIAL EFFECTS ON REACTION TIME, ACCURACY AND SIGNAL DETECTION.
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Identifier
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AAI8112363
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identifier
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8112363
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Creator
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KOSS, BETTY.
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Contributor
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Doreen Berman
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Date
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1981
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Language
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English
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Publisher
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City University of New York.
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Subject
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Psychology, Physiological
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Abstract
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An investigation was carried out to study the relative influence of perceptual sensitivity and decisional strategies on cerebral asymmetry in recognition of slopes. The variables looked at were the stimulus condition and visual field stimulated, as well as the eye and hand utilized in the task. The dependent variables included the reaction time for correct responses, percentage of accurate responses and two signal detection measures based on rating scales. The stimuli were black rectangles positioned in different orientations in the left or right visual field. They were presented to six right handed male subjects under two stimulus conditions. In stimulus condition vertical-oblique (V-O), rectangles were oriented either 90 degrees or 95 degrees from the horizontal, whereas in stimulus condition oblique-oblique (O-O), rectangles were oriented either 95 degrees or 100 degrees from the horizontal. For both conditions, the subject's task was to respond to the presentation of the stimulus oriented 95 degrees from horizontal.;Hemispheric asymmetries were reflected differently by the various laterality indices. With accuracy, an overall superiority for the right hemisphere was observed, along with an advantage for stimulus condition V-O and for the right eye. In comparison, with reaction time for correct responses, none of the main effects reached significance, but there was a highly significant interaction between visual field and stimulus condition. Also, stimulus condition O-O was processed faster in the right visual field of the right eye than in the left visual field. Results from signal detection analysis extended the findings of RT analysis by showing that the superior performance noted when stimulus condition O-O was projected to the right visual field of the right eye was dependent on decisional biases and not hemispheric superiority. The results are contrasted with those obtained by Umilta et al. (1974).
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Type
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dissertation
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Source
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PQT Legacy CUNY.xlsx
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degree
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Ph.D.
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Program
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Psychology
