The goals of this article are to appraise second language acquisition's (SLA) disciplinary progress over the last 15 years and to reflect on transdisciplinary relevance as the field has completed 40 years of existence and moves forward into the 21st century. I first identify four trends that demonstrate vibrant disciplinary progress in SLA. I then…

Practice is not meant to be understood as the opposite of theory, DeKeyser wrote; instead, practice involves specific activities in an L2 that learners engage in, deliberately, with the goal of developing knowledge of and skills in the L2. In the book "Discursive Practice in Language Learning and Teaching," by "practice" the author means something…

Studies about bilingualism and second language acquisition (SLA) have a long tradition within linguistic and psycholinguistic research. The contributions from psycholinguistic research are crucial to the improvement of neurolinguistic models. This importance stems from the fact that psycholinguistic research is posing more specific questions than…

In the position article to this volume, Klein outlines a set of questions that are relevant for furthering the linguist's understanding of what the cognitive and neural prerequisites for time in language might be. He also declares a certain skepticism regarding the likelihood that new methods from other disciplines will provide answers to those…

McCormack and Hoerl's state of the art review of the development of temporal concepts from the end of infancy to the end of the fifth year shows that young children's conception of time is quite different from that of adults. Adults and 5-year-old children can construe an event from a range of temporal perspectives and can describe it from a…

Studies investigating the possible effects of age at immigration (a proxy for age at onset of second language learning) on second language acquisition among immigrants often explicitly take the effect of length of residence in the destination country (a measure of exposure to opportunities to learn the second language) into account. A third…

Specifies language acquisition processes in terms of brain mechanisms to explain the variable success achieved by early and late learners and proposes a brain-based model for language acquisition on the basis of the literature. Two conditions for full acquisition of a language are motivation and grammatical ability. The neural underpinnings for…

Vygotskian psycholinguistics is not only compatible with current second-language acquisition (SLA) theory but also serves as productive example within which to conduct research and theory building. Three sections of the paper support the following claims: an overview of Vygotskian concepts, a summary of selected Vygotsky-based SLA research, and a…

Argues that the most productive future directions for theory building and research in applied linguistics derive from the extent to which the field's investigators can enrich their conceptual framework and methods with insights from "constructivist" scholarly approaches. Focus is on three arenas in which such approaches and additional scholarship…

Responds to a previous article on constructive and constructivist challenges for applied linguistics. (Author/JL)

Responds to a previous article on emergentism, connectionism, and language learning. Suggests that connectionist models of emergent language knowledge will continue to be important in the years to come. (Author/JL)

Expands on Ochsner's (1979) call for a "bilingual" attitude toward second language acquisition research. Suggests work be viewed as science and art in order to better understand what we do and how we do it. Argues that theorists use artistic and scientific devices in building theories, and consumers of those theories use aesthetic and…

Presents a research agenda in which the study of interlanguage becomes more central to the study of interlanguage pragmatics, assessing the state of acquisition research in interlanguage pragmatics, surveying work in interlanguage pragmatics that either directly examines or appeals to grammatical competence, showing how acquisition studies in…

Reviews two studies of the relationship between gender loading in languages and the perception of gender by speakers of those languages; the two studies reach contradictory conclusions. Examines a number of theoretical and methodological issues in linguistic relativity research and suggests avenues for further research. (SED)

Responds to comments made regarding an earlier article written by the author on processing instruction in second language learning. (Author/VWL)