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• W230698875 abstract "Although some recent investigators (e.g., Levy, 1974) have contended that the right hemisphere is deficient in the ability to engage in abstract conceptualization, evidence from split-brain studies indicates that the right hemisphere may even be superior to the left in the abstract processing of non-verbal stimuli. Nebes (1971) found that commissurotomized patients were better able to match an arc to the circle of which it was a part with their left than with their right hands; there were no inter-hand differences in arc-arc or circle-circle matching, and Nebes inferred a right hemisphere superiority in generating the concept of the whole from a fragment. Likewise, split-brain patients were better with their left than with their right hands in the tactile identification of a form most representative of, but not identical with, a set of five forms presented visually (Franco & Sperry, 1977). Furthermore, as the number of defining constraints on the geometric stimuli decreased, right-hand performance steadily declined, whereas left-hand performance was maintained at a relatively constant level of proficiency. Results obtained with commissurotomy patients have not, however, always been replicable in normal subjects, in whom there is opportunity for cross-talk between the hemispheres and for the influence of one hemisphere on the activities of the other. In the present experiment, we asked whether a right-hemisphere superiority in normal subjects could be demonstrated using a procedure based on the prototype-abstraction paradigm of Posner and Keele (1968, 1970). Posner and Keele found that subjects trained to classify distortions of prototypic random dot patterns were then able to classify the prototypes they had never seen before more accurately than they could new distortions which they had also never seen. They concluded that, in the process of learning the distorted exemplars of a prototype, the subjects had generated the abstract idea or schema of the prototype itself. It occurred to us that at least two fundamentally different cognitive strategies are available to subjects in the initial training phase. The first, emphasized by Posner and Keele, is to generate a schema or prototype representing the central tendency of the training series. The second is to" @default.
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• W230698875 date "1978-01-01" @default.
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• W230698875 title "Perceptual and Motor Skills, 1978, 47, 615-621. © Perceptual and Motor Skills 1978 CLASSIFICATION OF RANDOM FORMS AND DISTORTIONS PRESENTED TO THE LEFT OR RIGHT VISUAL FIELD" @default.
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