THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

The Design and Analysis of Experiments

Principles and Practice of Structural Equation Modeling (2nd ed.)

The calculation and use of effect sizes—such as d for mean differences and r for correlations—has increased dramatically in second language (L2) research in the last decade. Interpretations of these effects, however, have been rare and, when present, have largely defaulted to Cohen's levels of small (d = .2, r = .1), medium (.5, .3), and large (.8, .5), which were never intended as prescriptions but rather as a general guide. As Cohen himself and many others have argued, effect sizes are best understood when interpreted within a particular discipline or domain. This article seeks to promote more informed and field-specific interpretations of d and r by presenting a description of L2 effects from 346 primary studies and 91 meta-analyses (N > 604,000). Results reveal that Cohen's benchmarks generally underestimate the effects obtained in L2 research. Based on our analysis, we propose a field-specific scale for interpreting effect sizes, and we outline eight key considerations for gauging relative magnitude and practical significance in primary and secondary studies, such as theoretical maturity in the domain, the degree of experimental manipulation, and the presence of publication bias.

How Big Is “Big”? Interpreting Effect Sizes in L2 Research

Cognition and Second Language Instruction

Mixing, however briefly, with aphasic subjects is sufficient to show that though survives language alterations. Everyone's experience of forgetting proper names and common nouns clearly shows that concepts outlive words. Analyzing puns and allusions also reveals that the meaning of a word depends on a context of signification which may or may not be supplied verbally. Studying thought without language in both animals and infants provides evidence not only that language facilitates the exercise of cognitive functions but also that the initial progress facilitates the exercise of cognitive functions but also that the initial progress made by children is not related to language but to brain maturation. Dealing with the question of right hemisphere performance in patients with a brain split by callosotomy demonstrates, better than anything else, that each position taken on this question is underlain by philosophical presuppositions. In contradistinction with philosophies derived from that of Wittgenstein and from logical positivism and functionalist cognitivist theories, the author argues that all we know is through and within our thought, that all we say is thought and that, consequently, no scientific, philosophical, poetical or other discourse is able to apprehend or restrain thought. Thought extends far beyond language, including scientific language.

Language and thought

A study was conducted to identify the scope and timing of maturational constraints in three linguistic domains within the same individuals, as well as the potential mediating roles of amount of second language (L2) exposure and language aptitude at different ages in different domains. Participants were 65 Chinese learners of Spanish and 12 native speaker controls. Results for three learner groups defined by age of onset (AO) – 3–6, 7–15, and 16–29 years – confirmed previous findings of windows of opportunity closing first for L2 phonology, then for lexis and collocation and, finally, in the mid-teens, for morphosyntax. All three age functions exhibited the discontinuities in the rate of decline with increasing AO associated with sensitive periods. Significant correlations were found between language aptitude, measured using the LLAMA test (Meara, 2005), and pronunciation scores, and between language aptitude and lexis and collocation scores, in the AO 16–29 group.

Age of onset, length of residence, language aptitude, and ultimate L2 attainment in three linguistic domains

Language aptitude has been hypothesized as a factor that can compensate for postcritical period effects in language learning capacity. However, previous research has primarily focused on instructed contexts and rarely on acquisition-rich learning environments where there is a potential for massive amounts of input. In addition, the studies conducted to date have investigated cognitive aptitudes weighted heavily in favor of explicit processes (e.g., language analysis) and have overlooked potential individual differences in implicit cognitive processes. This study examines whether sequence learning ability (one aspect of a cognitive aptitude hypothesized to be relevant for implicit language learning and processing) is involved in early and late second language learners’ morphosyntactic attainment, as measured by two types of structures and tasks. Results revealed that sequence learning ability moderated scores on structures involving grammatical agreement relations in both early and late second language learners.

Individual Differences in Sequence Learning Ability and Second Language Acquisition in Early Childhood and Adulthood

1. List of contributors 2. Introduction and overview (by Granena, Gisela) 3. Part I. Age differences and maturational constraints 4. Maturational constraints on child and adult SLA (by Long, Mike) 5. Maturational constraints on lexical acquisition in a second language (by Spadaro, Katherine) 6. Age of acquisition effects or effects of bilingualism in second language ultimate attainment? (by Bylund, Emanuel) 7. Part II. Aptitude constructs and measures 8. Cognitive aptitudes for second language learning and the LLAMA Language Aptitude Test (by Granena, Gisela) 9. New conceptualizations of language aptitude in second language attainment (by Kormos, Judit) 10. Optimizing post-critical-period language learning (by Doughty, Catherine J.) 11. Part III. Age, aptitude and ultimate attainment 12. Reexamining the robustness of aptitude in second language acquisition (by Granena, Gisela) 13. Memory-based aptitude for nativelike selection: The role of phonological short-term memory (by Bolibaugh, Cylcia) 14. High-level proficiency in late L2 acquisition: Relationships between collocational production, language aptitude and personality (by Lundell, Fanny Forsberg) 15. Part IV. Implications for educational policy and language teaching 16. Some implications of research findings on sensitive periods in language learning for educational policy and practice (by Long, Mike) 17. Aptitude-treatment interaction studies in second language acquisition: Findings and methodology (by Vatz, Karen) 18. Subject index

Sensitive periods, language aptitude, and ultimate L2 attainment

This study investigated the extent to which cognitive abilities that involve explicit cognitive processes (i.e., explicit language aptitude) are related to second language (L2) learning outcomes under two corrective feedback conditions. The study followed a pretest-posttest-delayed posttest experimental design. Forty-eight L2 learners of English carried out three oral production tasks, in which their errors on the indefinite article were treated according to their group assignment (i.e., explicit, implicit, and no-feedback). A set of controlled oral production tests was administered as pretest and posttest. Explicit language aptitude was measured using three subtests from the LLAMA Language Aptitude Test battery (Meara, 2005). Results showed that explicit language aptitude predicted immediate posttest performance only under the explicit feedback condition, suggesting that this type of feedback requires mental processes that are facilitated by explicit cognitive abilities and that its short-term effectiveness is not the same for learners with different aptitude levels.

The role of cognitive aptitudes for explicit language learning in the relative effects of explicit and implicit feedback

This study examines the potential of learner-learner interaction through Synchronous Computer-Mediated Communication (SCMC) to focus learners’ attention on form. Focus on form is operationalized through Language-Related Episodes (LREs), instances where learners turn their attention to formal aspects of language by questioning the accuracy of their own or each other’s language use. The study also compares two task types, jigsaw and dictogloss, with respect to the number and characteristics of LREs. Ten adult intermediate ESL learners from an intensive English language program in the US worked together in dyads to carry out one jigsaw and one dictogloss task in an SCMC environment. Tasks were controlled for content and were presented in two alternative orders. The dictogloss in this study generated more LREs than the jigsaw. LREs were also qualitatively different across task types. Jigsaw LREs were implicit and did not result in incorrectly solved outcomes, whereas dictogloss LREs were explicit and resulted in correctly solved, incorrectly solved, and unresolved outcomes.

Gisela Granena

Papers

Age of onset, length of residence, language aptitude, and ultimate L2 attainment in three linguistic domains

Individual Differences in Sequence Learning Ability and Second Language Acquisition in Early Childhood and Adulthood

Sensitive periods, language aptitude, and ultimate L2 attainment

The role of cognitive aptitudes for explicit language learning in the relative effects of explicit and implicit feedback

The effects of task type in synchronous computer-mediated communication