An experiment was performed to determine if unfamiliar laboratory conditions can affect infant research results. (JMB)

Experiments presented indicate that perseverative error in year-old infants cannot simply be a memory problem. Possible explanations are examined. (Author/ED)

Tests the hypothesis that age-related shifts in infants' visual preferences for stimuli (varying in complexity as defined by number of light-dark intersections) are due to changing attention value both within and between the inversely varying dimensions of size and number. (Author/ED)

Bruner's (1973) review of infant skill development is updated and extended by (a) placing it in the context of recent motor learning research; (b) discussing the concept of efference in its most recent conceptualization; and (c) explicating certain implicit themes relevant to a theory of infant motor intelligence. (ED)

Presents two studies which investigated the effects of social stimulation on infant's vocalization rates. Experiment I focused on response-contingent and response-independent social stimulation. Experiment II focused on continuous or omitted social stimulation. In both studies, social stimulation increased vocalization and the rate of responding…

Study supported by the Ontario Mental Health Foundation (Grant No. 16) and the Association for the Aid of Crippled Children.

Infants' use of auditory information in guiding their search behavior is examined in this study. The subjects were two groups of 9-month-old crawling infants. Group 1 consisted of 24 infants and Group 2 of 16 infants. The auditory stimuli was the mother's voice. Infants in both groups were initially positioned by their mothers behind a screen in a…

This study investigated the hypotheses that 1) infants delivered from a left occiput anterior or transverse position (LOA/LOT) would exhibit a right supine head orientation in the neonatal examination and a right hand preference at 19 weeks of age; and 2) infants delivered from a right occiput anterior or transverse position (ROA/ROT) would…

IN EXPERIMENT 1, DEVELOPMENTAL CHANGES IN THE PROSODIC FEATURES OF INFANT VOCALIZING WERE STUDIED WITH NOVEL ELECTRO-ACOUSTIC TECHNIQUES. COMPLETE AND CONTINUOUS RECORDINGS OF ALL THE VOCALIZATIONS OF TWO INFANTS DURING THE FIRST FIVE MONTHS OF LIFE WERE COLLECTED AND SYSTEMATICALLY SAMPLED FOR ANALYSIS. COMPOSITE STATISTICS, DESCRIBING THE THREE…

Frequency difference thresholds were determined for fourteen 4- to 9-month-old infants (mean age, 6 months 10 days) using a discrimination learning paradigm, following a one-up, two-down staircase procedure. The subject heard 500 msec tone bursts repeated at a rate of one per sec, with a fixed standard frequency. At various points in this pulse…

This research study investigated the hypothesis that noncontingent social stimulation can elicit infant vocal sounds. The investigation involved an examination of both the course of social elicitation and the nature of the social releasing stimulus. Three experimental conditions were designed to measure: (1) the changes in vocalization rate during…

To determine the antecedents of sucking in infants, the behavior of 24 infants from 48- to 60-hours-old was observed in relation to a sucking device. The device measured pressure and rate of sucking and delivered a controlled flow of nutrient. The interfeeding interval was varied among the experimental and control groups. Little sucking behavior…

This study systematically investigated the influence of direction and frequency of rocking on the activity of two-month-old infants. Of the 84 subjects, 42 were males and 42 females. They were brought to the laboratory at least 2 hours after each feeding and placed supine in a bassinet. Rocking at 60 cycles per minute resulted in a greater…