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Peer reviewedSaudino, Kimberly J.; Eaton, Warren O. – Child Development, 1991
The activity level of 60 pairs of infant twins was measured for 2 days. Differences in activity level for monozygotic and dizygotic twins, as indicated by motion recorders and parent ratings, showed evidence of genetic influences. (BC)
Descriptors: Foreign Countries, Genetics, Infants, Measurement Techniques
