Research has demonstrated that second language (L2) vocabulary learning improves when target words are presented in acoustically varied compared with acoustically consistent formats. The present study investigated the extent to which this benefit of acoustic variability is a consequence of difficult encoding demands (cognitive effort hypothesis)…

What makes a child's language development trajectory have the patterns that it has, and what causes differences across children in those patterns? These fundamental questions have for over half a century been at the heart of research on language development in monolingual children, on the cross-linguistic development of language in children from…

Five experiments examined whether overt repetition (i.e., saying a word aloud) during exposure is critical to the expressive learning of new words. When participants did not engage in overt repetition during exposure, they nevertheless exhibited clear expressive learning, both with and without an accompanying semantics, indicating that overt…

Because words represent the building blocks upon which the facility to produce and comprehend language at all levels is based, the capacity of a child to learn words has immense impact on his or her developing abilities to communicate and engage properly with the outside world. Both the Keynote Article and the Commentaries in this issue…

Three experiments explored young children's metalinguistic awareness. Results showed that children between the ages of 4.5 and 6.5 demonstrate vigorous development of word segmentation skills, using increasingly complex strategies--first phrasal, then syllabic, and finally a full word strategy, and a growing knowledge of function and content…

Exploration of the usefulness of a visual preference technique for assessing word comprehension in infants demonstrated increases in comprehension from 8 to 14 and 14 to 20 months; established longitudinal stability of comprehension from 14 to 20 months; and showed a profound effect of stimulus salience and the lack of sex differences in word…

Phonetic skills and vocabulary size were investigated in 37 toddlers identified with specific expressive language impairment and 20 comparison toddlers. Results indicate significant differences in numbers of consonant types and tokens, although the most frequently present consonants were consistent across groups. No predictive relationship emerged…

Tested the hypothesis that individual differences in immediate-verbal-memory span predict success in second-language vocabulary acquisition. In the two-session study, adult subjects learned 56 English-Finnish translations. Tested one week later, subjects were less likely to remember those words they had difficulty learning, even though they had…