Laterality effects in twins.
The laterality effects in 10 symmetrical EEG derivations in twins (20 MZ and 20 DZ pairs with a mean age of 20.5 years) were examined. The quantitative and qualitative analyses gave the following results: (1) cotwins in the MZ and DZ pairs differed particularly in the intensity of asymmetry for EEG parameters--one was more asymmetrical than the other; (2) among the MZ twins there were no "mirror" pairs (opposite asymmetry of the EEG), even where opposite-handedness existed. For example, a right-handed twin had an asymmetrical EEG, while the other, a left-hander, had a symmetrical one; (3) the most asymmetrical EEG was in the temporal derivations showing a more active left hemisphere; and, (4) there was no evidence of genetic influence in the intensity of EEG asymmetry.
Meshkova
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TA
Institute of Psychology, Russian Academy of Education, Moscow.
D001921:Brain / Q000502:physiology*; D004569:Electroencephalography; D004594:Electrophysiology; D007839:Functional Laterality / Q000235:genetics*; D006801:Humans; D008297:Male; D008875:Middle Aged; D014429:Twins, Dizygotic; D014430:Twins, Monozygotic