Inheritance of behavior in infants.
Mental and motor abilities and personality development were studied in 20 pairs of infant twins of the same sex on a monthly basis in their first year, that is, before mutual imitation becomes a factor. Blood group determinations, made after the study was completed, revealed an N(1) of 11 fraternal and N(2) of 9 identical pairs. Within-pair differences were significantly greater within fraternal pairs on all tests and rating scales.
D005260:Female; D006801:Humans; D007223:Infant; D007231:Infant, Newborn; D007361:Intelligence Tests; D008297:Male; D009048:Motor Skills; D010551:Personality; D010554:Personality Disorders; D014427:Twins
INFANT; INFANT, NEWBORN; INTELLIGENCE TESTS; MOTOR SKILLS; PERSONALITY; TWINS