A method for direct observation study of early peer-social and object directed behavior in humans was designed to articulate with techniques widely used in studies of social behavior of infra-human primates. Occurrence of behavior fitting the definitions of each of six categories of object behavior and nine categories of social behavior is noted…

Previous studies have shown that American mothers, in contrast to Japanese, do more lively chatting to their babies, and that as a result, the American babies have a generally higher level of vocalization and, particularly, they respond with greater amounts of happy vocalization and gross motor activity than do Japanese babies. Thus, it appears…