Soviet investigation of the development of verbal inhibition of preseverative manual behavior are reviewed. Non-soviet investigations of verbal-manual interaction are considered in relation to the Soviet view of the development of voluntary behavior; and it is argued, on the basis of this evidence, that the Soviet position need not stand or fall…

Argues that the developmental origins of actions are actions themselves and that a future-oriented mode of control is basic to movement at all ages. Suggests that, through active movement, children learn about changing and invariant properties of movement and about coordination with the external world. This learning constitutes the foundation of…

Comments on the article by von Hofsten in this issue by examining four of von Hofsten's propositions: (1) physical actions are expressions of self-organizing systems composed of bodily, task-related, motivational, and environmental factors; (2) the ability to perform actions develops with age; (3) action is situated in a total postural background;…

Naturalistic observation of a set of identical twins revealed many differences in personality and motor development. (MS)

Sex differences in many aspects of early human development are reviewed: in physical growth and maturation, in motor activity and sensory capacities in infancy, in mother-infant interaction, in the onset of fear, in the social behaviour of pre-school children, in exploration, play and creativity, and in intellectual functions. (Author)

From a symposium on Cross-Cultural Studies of Mother-Infant Interaction at the Biennial Meeting for Research in Child Development, Minneapolis, Minn., April 2, 1971. (MB)