Multitask analysis of cerebral hemisphere specialization in monozygotic twins discordant for handedness

Author(s): Cherry, B. J., Neale, P. L., McBride, D. M., Segal, N. L.

Journal/Book: Neuropsychology. 1998; 12: 750 First St NE, Washington, DC 20002-4242. Amer Psychological Assoc. 468-478.

Abstract: This study constitutes a multitask appraisal of cerebral hemisphere specialization with 13 monozygotic (MZ) twin pairs discordant for handedness. Tasks included dichotic listening, finger tapping with concurrent loads, two tachistoscopic visual half-field tests, and a free-vision face test. Overall, MZ twins showed similar performance asymmetries on most tasks. Different asymmetries, however, were observed on the finger tapping with anagram load and visual half-field with chair stimuli. In these instances, asymmetries for left- and right-handed MZ twins were more similar to patterns reported in the literature for left- and right-handed singletons, respectively, than for opposite-handed co-twins.

Note: Article Kee DW, Calif State Univ Fullerton, Dept Psychol, Fullerton,CA 92634 USA

Keyword(s): INITIAL-VALUE DIFFERENCES; DUAL-TASK INTERFERENCE; PERCEPTUAL ASYMMETRIES; LATERALIZED INTERFERENCE; INDIVIDUAL-DIFFERENCES; EMOTIONAL EXPRESSIONS; CHIMERIC FACES; LEFT-HANDERS; CHORION TYPE; HUMAN FETUS

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