Artificial language learning (ALL) experiments have become an important tool in exploring principles of language and language learning. A persistent question in all of this work, however, is whether ALL engages the linguistic system and whether ALL studies are ecologically valid assessments of natural language ability. In the present study, we…

This paper examines the validity of Vygotsky's interpretation of the private speech (PS) phenomenon on the basis of findings reported in the literature. A review of available findings provided support for an age-related shift from overt to covert means of verbal self-regulation and for an interpsychological to intrapsychological shift in the…

In recent years, T-unit analysis has been applied in second language research to characterize the syntactic nature of linguistic input and to assess the syntactic maturity of the learners' written production. This measure has been seen to provide an objective and reliable method of determining the overall complexity of language samples. However,…

Analysis of data from studies investigating the effectiveness of a parent report form for assessing children's early language development showed that the vocabulary checklist had substantial validity, and that it helped parents to provide a valuable overall evaluation of their children's language at 20 months. (Author/CB)