The purpose of this study was to establish a set of normative data (growth curve and centiles) for the Infant Monitor of vocal Production (IMP) using a representative population of infants with typically developing hearing. A linear mixed effect model and regression was used to derive 'stage-for-age' trajectory and growth centiles from the…

Studied across a 16-month period, young children of deaf parents showed accelerated early language development, on the average producing their first recognizable sign at 8.5 months, their tenth sign at 13.2 months, and their first sign combination at 17.0 months. Findings are inconsistent with previously reported patterns of synchrony between…

Examined continuity in 94 children's vocalization and language development. Acquired data from parent reports of children's vocal and lexical development from 14 to 18 months, and from language development scales administered at 18 months. Found that early vocalizers comprehended and produced more words and suffixes than late vocalizers, and that…