Abstract
WILSON, RONALD S.; BROWN, ANNE M.; and MATHENY, ADAM P., JR. Emergence and Persistence of Behavioral Differences in Twins. CHILD DEVELOPMENT, 1971, 42, 1381-1398. The mothers of 232 pairs of twins were interviewed periodically about the similarities and differences in behavior displayed by their twins during infancy and early childhood. The results on 17 behavior variables showed that (1) twins were frequently discordant on such variables as attention span, temper, vocalization, and smiling; (2) there was a high degree of age-to-age stability in behavior; (3) at 1 year of age, discordant twins were differentiated primarily on temperament and attention span, but by 4 years of age the twins were distinguished chiefly by differences in sociability; and (4) concordance was generally higher for MZ twins than DZ twins.
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