Results of this study indicate that learning occurred only under immediate reinforcement and that there was no developmental trend in the ability to withstand the detrimental effects of delayed reinforcement. (WY)

Paper is based on a dissertation submitted in partial fulfillment of the requirements for the degree of Doctor of Philosophy from Case Western Reserve University. (WY)

Attempts to determine whether the stimulus dimension to which infants respond is different in fixed-trial and infant-control methodologies. Infants 10 weeks of age were shown four facelike patterns differing along two dimensions: number of elements and extent to which elements were organized to resemble the human face. (Author/RH)

Examines questions concerning (1) individual consistency in habituation rate to different visual stimuli and (2) individual consistency in habituation rate and exploratory activity. Twenty-four infants 4 months of age were habituated to four stimuli in two sessions, then observed in free exploration. Methodological aspects of habituation and an…

Examines (1) whether and when the development of preterm children of very low birth weight would begin to approximate that of demographically matched full-term children, and (2) whether test scores corrected for degree of prematurity or those based on chronological age would be the more accurate predictors of subsequent development. (RH)

Investigates the degree to which object familiarity and motivational factors influence infants' search behavior in an object-permanence test. (Author/MP)

Responses of 80 10-month-old infants to brief maternal separation were observed in home and laboratory settings and in two conditions of maternal accessibility: mothers' exit door closed or open. Results show the importance of situational determinants in the investigation of infant attachment behavior. (Author/RH)

Investigates spatial orientation of infants, comparing behavior in the laboratory to behavior in the infant's home. Also investigates whether the infant relies on his body as a spatial reference system. (Author/SS)

To determine whether heart rate increase can be attributed to increased sucking amplitude for sweeter fluids, sucking and heart rate of 20 full-term infants were studied. (MP)

A replication study of directed reaching in children. In response to a visual stimulus the arm and hand movements of infants were videotaped and analyzed to determine whether the position of the ball affected the direction of the infants' extensions. (Author/SS)

Examines the relationship between an infant's sex and its capacity to maintain eye contact. Subjects were 15 male and 15 female newborn infants. (MP)

A measure of mother-infant synchrony was developed and used to compare the interactions of mothers with pre-term and mothers with full-term infants. Each mother-infant dyad was observed during a standard bottle feeding session on three separate occasions: once prior to discharge and at one and three months after discharge. (JMB)