Automated coding of implicit motives: A machine-learning approach

Motivation and Emotion - Implicit motives are key drivers of individual differences but are time-consuming to assess, requiring many hours of work by trained human coders. In this paper we report...     

Neurobehavioral reorganization in early infancy: Patterns of head orientation following lateral and midline holds

Head orientation was investigated in a longitudinal study of 37 infants, who were observed at ages 2, 4, 8, and 12 weeks, during a 60-second period that followed each of four (60 second) midline or lateral holds. When newborn, the infants tended to lie with their heads to the right, but this bias weakened over the first 3 postnatal months. This rightward motor bias was constrained further by such factors as sex and holding position; both factors had their strongest effect at 8 weeks. Finally, evidence was found for behavioral reorganization of postural orientation such that head orientation was less influenced by prior head positioning after than prior to 8 weeks.     

Motor asymmetries in the human infant: Stepping movements

Stepping movements were investigated for evidence of early motor asymmetry in 24 familial right-handed infants and 14 familial left-handed infants at each of five ages: 2–3 days after birth, 14 days, and 1, 2, and 3 months of age. Results indicated a nonsignificant right leg advantage during the newborn period, with few significant lateral preferences evidenced in either direction at later testing ages. These results fail to indicate that a reliable leg preference persists beyond the newborn period, particularly among familial right-handed infants. Thus, it seems unlikely that an asymmetry in stepping movements during early infancy marks the beginning of a direct developmental path that culminates in a motor asymmetry in later childhood.     

On the state-dependent nature of infant head orientation

The relationship between infant state and head orientation after the head is held in a midline or lateral position was investigated longitudinally in infants 2, 4, 8, and 12 weeks of age. Across the four ages, there was a general decrease in the amount of time spent in an active-awake state, whereas the amount of time spent crying remained fairly stable. Overall, infants turned more often to the right than to the left, but this difference was more pronounced when the infants were quietly alert or active-awake than when they were crying. The results thus indicate that state variables influence the expression of headorientation biases in early infancy.     

A longitudinal study of lateral biases in parents' cradling and holding of infants

Lateral preferences in parents' cradling and holding of their infants were assessed in a longitudinal study commencing 1–3 days after birth and ending at 18 months. Right-handed parents showed a consistent left-side preference, which declined slightly as the infants grew older. Left-handed mothers showed an initial left-side preference and then more variable holding behavior, including right-side preferences, in some conditions. No relationship between the parents' holding behavior and two measures of infant head posture was found. It is suggested that parental side-holding preferences and infant head orientation biases are components of a biobehavioral system designed to enhance the organization of the caregiver-infant relationship.     

Parents' perceptions of their infant's day care experience

Parents of infants who had been enrolled in a day-care center were asked to evaluate their day-care experience as well as their children's current development status. In general, parent evaluations provided strong support for day care as an effective means of supplementary infant care. When dissatisfaction with day care was expressed, it focused on matters pertaining to infant health, physical resources of the center, parent involvement in center activities, and caregiver-infant ratios. Parents perceived their children to be advanced in competence skills relative to their peers. With few exceptions, parents viewed group day care as the most desirable type of supplementary infant care, but only if high-quality staff and programs could be assured.     

Maternal perceptual style and mother-infant play behavior

Normal mothers' perceptions of an older child at play were used to assess maternal perceptual biases. Mothers then engaged in play encounters with their 15-month-old infants. Perceptual biases were related to infant and mother play behaviors. For example, positive perceptions were related to positive play and interpersonal behaviors, including mutual play and exchange games. The data suggest support for the hypothesis that maternal perceptions of child behavior may affect maternal behavior and thereby influence mother-child interactions.