Our motivation was to examine how toddler (2;6) and adult speakers of American English prosodically realize information status categories. The aims were three-fold: (1) to analyze how adults phonologically make information status distinctions; (2) to examine how these same categories are signaled in toddlers' spontaneous speech; and (3) to analyze…

This study examines infants' joint attention behavior and language development in a rural village in Nigeria. Participants included eight younger (1;0 to 1;5, M age=1;2) and eight older toddlers (1;7 to 2;7, M age=2;1). Joint attention behaviors in social interaction contexts were recorded and coded at two time points six months apart. Analyses…

Effects of negative input for 13 categories of grammatical error were assessed in a longitudinal study of naturalistic adult-child discourse. Two-hour samples of conversational interaction were obtained at two points in time, separated by a lag of 12 weeks, for 12 children (mean age 2;0 at the start). The data were interpreted within the framework…

This study investigated the effectiveness of a natural environment language training procedure that combined the mand-model procedure and the time delay procedure for the acquisition of noun signs and for the spontaneous use of the signs acquired. One autistic boy, aged 5 years, 4 months with no verbal imitation skills and few movement imitation…