Visual hemifield asymmetries in analytic versus holistic processing.
Item
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Title
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Visual hemifield asymmetries in analytic versus holistic processing.
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Identifier
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AAI9119656
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identifier
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9119656
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Creator
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Matos, William Douglas.
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Contributor
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Adviser: Tina Moreau
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Date
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1991
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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, Experimental
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Abstract
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The role of instructional set--to identify the gestalt, overall configurations or to identify the elements of the configurations--in visual hemifield asymmetries for the processing of patterned dot stimuli presented at each of five visual field loci (far left, near left, central, near right and far right) was investigated. The direction and degree of lateralized cerebral processing of these stimuli was assessed via accuracy and reaction time measures.;The 16 right handed men were administered a shape judgment (holistic) task followed by a dot enumeration (analytic) task, or vice versa. A trial for each task consisted of (1) assessment of whether the vernier lines (fixation task) were aligned or misaligned, and (2) determination of the shape or number of dots comprising the shape via a keypress response made with either the left or right hand.;The data were subjected to four ANOVAs for each of the two response measures. The initial analyses showed that responses to stimuli presented at the CVF were more accurate than to those presented in both the LVF and the RVF; reaction times to CVF stimuli were faster than to stimuli presented in the far left visual field. Further analyses showed that shape judgments were more accurate and faster than those of dot enumeration, responses to stimuli presented in the RVF were faster than responses to LVF stimuli, and reaction times to near field stimuli were faster than to far field stimuli. For shape judgments, responses were more accurate to RVF than to LVF stimuli, a relationship that was dependent on task order, and responses were more accurate and faster to near than to far loci stimuli. For the dot enumeration task, accuracy differences between the visual fields were dependent upon the responding hand and the task order. Other significant interactions were observed as functions of task (instructions), visual hemifield, responding hand and task order.;The results are discussed in terms of models of hemispheric functioning, the role of spatial frequency of the stimulus, subject strategies and procedural manipulations.
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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.
