In 3 experiments, 9-month-old infants' expectations for what distinct count noun labels refer to were investigated. In Experiment 1, a box was opened to reveal 2 objects inside during familiarization: either 2 identical objects or 2 different objects. Test trials followed the same procedure, except before the box was opened, the contents were…

Challenges Gentner's (1982) claim that nouns are universally predominant in children's early vocabularies, noting that when a conservative method of counting nouns was used, 9 out of 10 22-month-old monolingual Mandarin-speaking children produced more verbs or action words than nouns or object labels in their naturalistic speech. (MDM)

This study analyzed data from a diary study of a child's lexical development. Correct forms and errors in the use of the plural morpheme were recorded from 18 to 30 months. Morphology was acquired before syntax, and there was evidence for a syntactic definition of noun by the age of 20 months. (BC)