A total of 114 infants at three age levels (11, 18, and 28 weeks) were rated by their mothers on a termperament questionnaire and subjected to a habituation procedure. Results suggest that subject loss in habituation studies may be the result of nonrandom individual difference factors and not just the result of temporary fluctuations in state.…

This reply refers to PS 502 443. (CB)

Discusses implications of a study of middle-class infants seen in the Ainsworth strange situation at 12.5 and 19.5 months; the investigation produced results inconsistent with the corpus of previous findings. (Author/RH)

Asserts (1) that contrary to Waters, findings affirm the importance of viewing mother-infant attachment as a dynamic relationship, responsive to family conditions, and (2) that these findings are consistent with those of other researchers. (Author/RH)

Argues that developmental psychologists need attitudes, methods, and conceptual schemes that integrate the distinctive contributions of both nature and nurture in order to study change and consistency in developmental functions, as well as individual differences in behaviors of interest. A conceptual scheme for early mental development is…

This study was designed to determine the extent to which (speech) motor timing control, as defined by a statistical model, improves in consistency with age and the degree to which peripheral feedback is used by children to maintain this consistency. Clinical applications and possible genetic implications are discussed. (Author/ED)

Paper considers some of the problems facing the researcher interested in patterns of abilities as revealed by a discussion of the Lesser studues (1971), presentation of reanalyses of their data, and a critical review of the research. (Author/CB)