Investigates infants' fear reactions in response to a potentially frightening toy as a function of their having control, or not having control, over the toy's movements. Subjects tested were 24 boys and 24 girls, age 12 to 13 months. (Author/SS)

The distressed vocalizations of six-month-old infants interacting with peers in a playroom were statistically independent of the peer's vocalizations of distress. Absence of toys reliably predicted the extent of the infant's distress, whereas psychomotor development and sex did not. (Author/ DB)

This study was designed to identify aggressive actions in 12-, 18-, and 24-month-old infants and to investigate what type of responses these actions elicit in peers. Nine infants were observed and videotaped in interaction with each other and with toys. The focus was on four 18-month-olds observed in two sessions, one with an older child, the…

Seventeen sets of opposite sex twins, 13 to 14 months old, were observed in a playroom situation with their mothers. Attachment behaviors, toy preference, style of play, and activity level were recorded. Analysis of four attachment behaviors indicated that girls looked at, vocalized to, and maintained proximity with their mothers significantly…

This study examines the degree to which young children are influenced by the familiarity of an adult participant in their pretend play with toys which vary in resemblance to highly prototypical objects (e.g., cup-like cups or doll-like dolls). A group of 29 children, mean age 21 months, was divided into two experimental groups balanced by sex; 15…

Reports a series of studies conducted to investigate possible differences in the exploratory manipulation and play behavior of human infants 7-1/2- 11-1/2 months of age as a function of the attributes of the stimulus, the familiarity of the subject with the stimuli, the age and sex of the infants, and individual differences. (Author/CS)

This study examines the influence of maternal predispositions toward sex-appropriate behavior and the mother's response to "feminine" or "masculine" cues in infant behavior. In the investigation, one 6-month-old male infant was presented to 11 mothers who served as subjects. The infant was dressed as either boy (blue clothes) and named Adam, or…