Hungarian pediatrician Emmi Pikler theorized that freedom of movement facilitates infants' development and learning. The self-education promoted by freedom to move gives an infant a lasting view of herself as a competent learner. Pikler's approach also emphasizes the importance of helping each child feel respected and secure. The author examines…

The aim of the present study is to elucidate the influence of context on the kinematics of the reach-to-grasp movement. In particular, we consider two basic modes of social cognition, namely cooperation and competition. In two experiments kinematics of the very same action--reaching-to-grasp a wooden block--were analyzed in two different contexts…

In this study, the number of alternatives for an extended arm swing was varied in order to test two memory drum predictions regarding movement refractoriness. (JS)

In contrast with controls and newborn presented with static models, only newborn presented with dynamic models reproduced the models' actions at significant levels. Infants in the static condition fixated the experimenter longer than those in the dynamic one. Results are discussed in terms of neurophysiological findings concerning the control of…

In three experiments, 5-month-old infants discriminated between a perfectly contingent live display of their own leg motion and a noncontingent display of self or a peer. They showed this discrimination by preferential fixation of the noncontingent display. (Author/NH)

Using the Newtonian relationship F equal MA, the author discusses three interpretations of the equation: (1) the engineering approach, (2) the Machian "field approach, and (3) the Newtonian approach as used by Arons. Contends that there are three types of definitions: conceptual, behavioral, and operational. Author illustrates these…

Data for this study are from a dissertation submitted in partial fulfillment for the Ph.D. degree, University of Illinois, 1967.

This paper discusses a method of treating electrogoniometer data on angular velocity, angular acceleration, and angular displacement to elicit instantaneous values. (MB)

Investigated 5-month-olds' perception of an object whose center was occluded and whose ends were visible only in succession. Found that infants perceived the object as one connected whole when the ends underwent common motion but not when the ends were stationary. Results suggest that infants perceive object unity but not object form. (Author/BC)

Results provided evidence that 6- and 12-week-old infants' preferences for a moving set of stripes over a stationary set were based on the velocity rather than on the temporal frequency of stripe movement. Estimated velocity thresholds of 9 degrees per second for 6 week olds and 4 degrees per second for 12 week olds extended results of previous…

After haptic habituation to a ring display, infants perceived the rings in two experiments as parts of one connected object. In both haptic and visual modes, infants appeared to perceive object unity by analyzing motion but not by analyzing figural goodness. (RH)

A model for solution of the motion correspondence problem is presented that is capable of maintaining the identities of individuated elements as they move. Many properties of the model are consistent with what is known about physiological mechanisms underlying human motion perception. (SLD)

The 1954 review of visual motion perception by James J. GIbson anticipated future developments in the field, but these developments were achieved without closely following Gibson's ideas. Reasons for the dormancy of his ideas are explored, and contemporary work on motion perception is evaluated from Gibson's perspective. (SLD)

In 4 experiments, the authors investigated spatial updating in a familiar environment. Participants learned locations of objects in a room, walked to the center, and turned to appropriate facing directions before making judgments of relative direction (e.g., "Imagine you are standing at X and facing Y. Point to Z.") or egocentric pointing…