Parker and Gibson's developmental model of evolution of language and intelligence in early hominids is described and discussed; data from a comparative study of object manipulation in two apes and a human infant are reported; and, human ontogenic developmental retardation in locomotion is discussed in terms of its implications for the differential…

Compared the impact of a small box emitting sounds in response to nearby motion introduced into an infant/toddler and a preschool classroom to illustrate qualitative differences in how children of different ages recognize the same objects as mediating devices for activity. Found that the box became a social object for infants/toddlers and part of…

Maintains that young children learn to think when they act on objects, thus developing what Piaget refers to as physical and logico-mathematical knowledge. Teachers can encourage thinking/mental action by creating situations that are personally meaningful to the children, by providing decision-making opportunities, and by providing opportunities…