Five experiments were conducted in order to determine what effect independent movement of an internal element has on the externality effect in young infants, and to consider the value of contrasting explanations of the effect itself. Subjects were 90 infants ranging in age from 28 to 49 days. (MP)

Examined organization of 5.5, 8.5, and 11.5-month-olds' reaching skill for stationary and moving targets. Found that infants of all ages made anticipatory adjustments of hand alignment; effectiveness of these adjustments improved with age. Regardless of age, infants used dynamic information from spinning and oscillating targets to update ongoing…

Evaluated role of visual input during reaching and grasping. Found that both infants and adults completed a reach and grasp to a darkened object but used vision when object remained visible. Infants contacted the object more often when it remained visible, although with longer durations and more movement units. Adults reached faster and more…

The reaching behavior of 12 infants in the presence of solid objects and pictures of objects placed within and beyond possible contact distance was videotaped in three sessions at 15, 19, and 24 weeks of age. (Author/MS)

The research reported in this symposium paper attempts to underline a Piagetian distinction concerning object concept which has tended to be ignored by psychologists working along Piagetian lines. More specifically, this research tested the hypothesis that intellectual development plays a role in the development of stranger reactions. The subjects…