The current study examined the influence of maternal characteristics on the development of infant smiling and laughter, a marker of early positive emotionality (PE) and how maternal characteristics and the development of infant PE contributed to subsequent maternal parenting. One hundred fifty-nine mothers with 4-month-old infants participated.…

Self-produced locomotion is regarded as a setting event for other developmental transitions in infancy with important implications for socioemotional development and parent-child interaction. Using an age-held-constant design, this study examined changes in reported infant behaviour and maternal proactive/reactive control and compared them with…

Three-month-old Cameroonian Nso farmer and German middle-class infants were compared regarding learning and retention in a computerized mobile task. Infants achieving a preset learning criterion during reinforcement were tested for immediate and long-term retention measured in terms of an increased response rate after reinforcement and after a…

An interesting paradox in the developmental literature has emerged in which fast-habituating babies tend to be temperamentally difficult and fast language learners, even though temperamentally difficult babies tend to be slow language learners. The purpose of the present investigation was to examine whether the paradoxical relationships among…

The purpose of the current study was to investigate the development of sleep-wake and melatonin diurnal rhythms over the first 3 months of life, and the potential effect of bed-sharing on their development. It was hypothesized that increased maternal contact through bed-sharing would affect the development of rhythms in human infants. Ten…

Studying normal infant development is a challenge for cognitive scientists in general and for neuroscientists in particular because: (1) physiological indices of infant cognition are generally noisy and technically difficult to obtain; and (2) interindividual variability and a paucity of established results make data interpretation very complex,…

Previous work by our group has shown that infant emotional vitality (EV), the lively expression of shared emotion both positive and negative, predicts cognitive and language abilities in toddlerhood. Specifically, infants who demonstrated a pattern of high emotional expression combined with high bids to their caregivers, fared significantly better…

Infants' differential vocal response (DVR) towards their mother and a female stranger at 3 months of age has been predominantly investigated as an index of early cognitive functioning. The present study explored the relationship between DVR and different infant and mother indicators of the developing relationship quality in a sample of 23…