Infant-directed speech (IDS) is characterized by a range of register-typical characteristics. Many of those can be objectively measured, such as acoustic-prosodic and structural-linguistic modifications. Perceived vocal affect, however, is a socio-emotional IDS characteristic and is subjectively assessed. Vocal affect goes beyond acoustic-prosodic…

From a dynamic systems perspective, transition points in development are times of increased instability, during which behavioral patterns are susceptible to temporary decoupling. This study investigated the impact of the vocabulary spurt on existing patterns of communicative coordination. Eighteen typically developing infants were videotaped at…

The report reviews assessment guidelines developed for visually impaired infants (birth-24 months). Project staff examined research on the assessment of infants with vision loss and identified material relevant to their needs. Following a review of existing assessment tools, guidelines were prepared in the following areas: social competence,…

The infant's impressions of his environment are viewed by several philosophers, including Jean Piaget. There has been some past tendency to suppose that, prior to the acquisition of language, the infant has no real impressions about his environment. More recent understandings consider that the infant is capable of conceptualization and can express…

Studied partner and site novelty for mother-infant, stranger-infant, and mother-stranger face-to-face interactions. Found that adult-infant vocal timing measures at age 4 months did predict attachment and cognition at age 12 months. Comparison of mother-infant and stranger-infant interactions suggested the dynamics of infants' early…