In this study, infant vocabulary development was tracked in a multilingual society (Singapore) within a socioeconomically diverse sample. The sample comprised 1316 infants from 17.4 to 27.7 months (669 females, 647 males; 88% Chinese race, 4% Malay, 4% Indian, and 0.004% mixed-race [4% declined to provide race information]). Children varied in…

Two experiments examined infants' ability to form a spatial category when habituated to few (only 2) or many (6) exemplars of a spatial relation. Sixty-four infants of 10 months and 64 infants of 14 months were habituated to dynamic events in which a toy was placed in a consistent spatial relation ("in" or "on") to a referent…

Researchers have suggested that as children's language skill develops in early childhood, it comes to help children regulate their emotions (Cole, Armstrong, & Pemberton, 2010; Kopp, 1989), but the pathways by which this occurs have not been studied empirically. In a longitudinal study of 120 children from 18 to 48 months of age, associations…

Presents data showing that the MacArthur Communicative Development Inventory's (CDI) large variability, lack of stability, and insufficient ability to predict early language delay are authentic reflections of individual differences in early language development rather than measurement deficiencies. Responds to critiques regarding sociodemographic…

Psychometric properties of the MacArthur Communicative Development Inventory (CDI) were examined. Findings suggested that the CDI reflects the progress of language development within the age range 10 to 27 months. Findings support caution in using results to identify individuals at risk for language deficits, to compare groups with different…