Abstract
The development of postural control is fundamental to virtually any other behavior, yet data on its ontogeny in anthropoid species are lacking. In this study, the Riesen and Kinder (1952) Postural Schedule for Infant Chimpanzees was used to compare the postural development of an infant bonobo (Pan paniscus) and an infant chimpanzee (Pan troglodytes) to that of each other, to that of nursery-reared chimpanzees ( Riesen & Kinder, 1952), and to that of normative humans ( Gesell & Thompson, 1938). These subjects, although of different species, displayed similar development and attained many behaviors earlier than the nursery-reared chimpanzees. All ape subjects, especially those in the current study, developed most behaviors several weeks earlier than did humans. Results support Riesen and Kinder's finding that rate of early motor development differs in Pan and Homo infants, but this study also suggests that within a genus or species there are rearing effects which can facilitate or retard development of certain skills.
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