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  • Title: Laterality effects, levels of processing, and stimulus properties.
    Author: Simion F, Bagnara S, Bisiacchi P, Roncato S, Umiltà C.
    Journal: J Exp Psychol Hum Percept Perform; 1980 Feb; 6(1):184-95. PubMed ID: 6444992.
    Abstract:
    Two hypotheses of hemispheric specialization are discussed. The first stresses the importance of the kind of processing to which the stimulus is subjected, and the second stresses the importance of the nature of the stimulus. To test these hypotheses, four experiments were carried out. In Experiment 1 verbal material was employed in a same-different classification task, and an overall right visual field superiority was found. Experiment 2, in which verbal stimuli were subjected to visuospatial transformations (i.e. mental rotations), yielded no laterality effect. In Experiment 3 geometrical figures were employed in a classification task similar to that of Experiment 1, and an overall left visual field superiority was found. In Experiment 4 both verbal and geometric stimuli were employed. The results showed a significant interaction between field of presentation and nature of the stimulus and no interaction between field of presentation and level of processing.
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