Paper present the findings from a study focusing on the relationship between levels of object concept construction and achievements in several other branches of functioning. (Author/CB)

Portions of this paper were read as part of a symposium on The Meaning of Smiling and Vocalizing in Infancy'' at the 1970 meeting of the American Psychological Association, Miami Beach, Florida, September, 1970. (Editor)

Author claims that Piaget's account of the construction of reality needs modification and a shift in emphasis. (Author/MB)

Initial experiment demonstrated operant acquisition of an instrumental hand-pulling response in 4-8-month-old infants; the effect achieved with contingent, noncontingent, delayed reinforcement, and the suppression, recovery, and facilitation effects of noncontingent stimulation are discussed. (Author)

In a naturalistic behavioral stdy, it was found that prematures have significantly more endogenous smiling than full-term newborns. (Authors)

The results of this experiment were presented at the 11th International Ethological Conference, Rennes, France, September 2-5, 1969. (MH)

Results indicate that (1) babies have better concept of person than object as permanent, but there are important individual differences, (2) rate of person permanence development is related to infant-mother attachment, and (3) rate of person permanence development affects object permanence development. (MH)

Male infants habituated their fixation time over trials and differentiated between the novel and familiar stimuli when the posthabituation interval was 15 seconds, but neither male nor female infants did so when the interval was 5 minutes. This paper is based upon a thesis submitted by the first author in partial fulfillment of the requirements…

Results of this study of 72 4-month-old infants suggest caution in using an overt demonstration of habituation as a necessary index of perceptual learning. (Author/MG)