This study measured infant responses to mother and stranger as a function of mother and stranger distance. A group of 10-month-old infants were pretested for level of object permanence and person permanence, and 18 males and 18 females were chosen as study participants. The infants were randomly assigned to one of three treatment groups: (1)…

Thirty-one papers and reports dealing with recent work on language input to children are listed in this annotated bibliography. The annotations, which are descriptive rather than evaluative, summarize the design of each study, the nature of the data, and some of the results and conclusions. Entries by P. Broen, J. Bynon, L. Cherry, J. M. Crawford,…

This study analyzes the effects of one environmental property, illumination, as part of a general program to isolate differential effects of specific properties of the novel environment on attachment behaviors in infants and young children. Attachment is operationalized into two response classes: (1) proximity to the mother, and (2) contact with…

This document reports a study investigating the effects of father absence on measures of cognitive, social, and motivational development in infancy. The sample included 54 black infants, 27 of whom were classified "father-absent." This classification was based on two indices, (1) a dichotomy of father-absent or father-present based on…

Six- and nine-month-old infants were exposed to contingent or non-contingent perceptual stimulation from a source which was spatially displaced at 60 from the infant's midline. Reliable operant acquisition was observed in the case of the nine-month-old infants, but not in the case of the six-month-old infants whose performance was similar to that…

Ten mother-infant dyads were observed in their homes for four hours each during one month in order to measure interactive aspects of their behavior. Demographic data are included for the participating families, who are members of the Wolof in Senegal, Africa. For this study, interaction was defined as a sequence of behaviors involving both…

This paper deals with three areas concerning early vocal development: (1) review and critique of existing experimental evidence suggesting that early vocal behavior has the properties of an operant response, (2) speculations concerning the role of non-verbal vocal behavior in early psychological development, and (3) suggestions for future…

A method for reading Piaget is presented in this guide, written for practicing teachers who want better understanding of Piaget's writings. An account of a Piagetian experiment is given, followed by a discussion of its theoretical and practical implications. Eight topics are explored: number, measurement, knots, perspectives, coordinates, floating…

Sixty-five Kikuyu infants were developmentally evaluated (Bayley Test) at two-month intervals during the first year of life. Precocity was demonstrated for mental as well as motor test performance. Familial economic status was positively related to infant performance. Social and demographic variables contributed at least 25% to test score…

A two-process model of infant visual attention is constructed based on research using the modified Berlyne technique with three- to five-month olds. The length of time an infant fixated a pattern was examined along with what caused him to turn to the pattern at all. The study was based both on a re-examination of previous research and on new…

Investigating learning by imitation in infants and young children, this study addresses itself to the following issues: whether there is systematic accommodation, whether this imitation follows a universal sequence, how the development of an act over many trials relates to the development of indicators over many months, and what the phenomenon…

The purpose of this study was to investigate whether or not infants who had experienced different types of naturally-occurring, significant separations from an attachment figure during the first year of life differed in their response to separation at 12 months of age. Thirty-three 12-month-old Caucasian infants from middle class, intact families…

A number of infantile nonverbal behaviors are listed that can be interpreted as signs of a child's fundamental psychosocial orientations to others during the first year. Ethological studies of child and adult nonverbal communication suggest a considerable degree of neoteny in the human sign system. (SW)

Tests the egocentric hypothesis, i.e., if it can be shown that, given spatial cues, an infant searches at a position bearing an invariant relation to these cues, but with a varying egocentric position, then there would be strong evidence that his organization of space is not necessarily egocentric. (Author/RK)