Factors affecting second language listening comprehension gies-that is, those who are aware of and use effective strategies, such as avoiding mental translation-demonstrate better L2 listening comprehension. 2 In addition to these general cognitive abilities, a number of factors pertaining to experience with the L2 influence listening skill. These factors include the amount of prior exposure to the language; familiarity with and an ability to understand the non-native language's phonology; vocabulary size; and background knowledge about the topic, text, structure, schema, and culture.Familiarity with the L2 changes the extent to which the L2 listener uses top-down or bottom-up strategies in listening. For example, expert listeners use both types of strategies: They are able to accurately make sense of the speech signal (bottom-up information) 3 and integrate this information with PurPose-To establish what is currently known about factors that affect foreign language listening comprehension, with a focus on characteristics of the listener, passage, and testing conditions.ConClusions-Research on second language (L2) listening comprehension strongly supports the importance of a number of factors, for example, a listener's working memory capacity and the number of ideas in a passage. Much of the research, however, reports weak or inconclusive results, leaving many factors and complex interactions among factors unresolved and in need of further investigation.relevanCe-Identifying the factors that affect L2 listening comprehension will help Defense Language Institute Proficiency Test (DLPT) designers anticipate how qualities of selected authentic materials will impact listening comprehension. Executive Summary PurPoseThe U.S. Government administers the Defense Language Proficiency Test (DLPT) to military linguists and other government personnel to assess their listening and reading comprehension in a number of foreign languages, including critical languages such as Mandarin, Modern Standard Arabic, Egyptian Arabic, and Persian Farsi. The DLPT is updated every 10 to 15 years, and the most recent transition-from DLPT IV to DLPT5-included a greater emphasis on testing listening comprehension with authentic materials. In turn, this has led to a growing interest in the factors that make second language (L2) listening difficult.To examine these factors, CASL reviewed the current scientific literature and summarized the characteristics of listeners, passages, and testing conditions. The review targeted features of particular interest to stakeholders at the Defense Language Institute (DLI). The long-term goal of the project is to support the selection of authentic listening materials that accurately reflect different proficiency levels. ConClusionsAlthough the available research on L2 listening comprehension is limited, CASL's literature review identified several factors that affect listening comprehension. These factors are summarized below and in Tables 1, 2, and 3. 1 Characteristics of the listenerUnderstanding a fo...

Many experiments with infants suggest that they possess quantitative abilities, and many experimentalists believe that these abilities set the stage for later mathematics: natural numbers and arithmetic. However, the connection between these early and later skills is far from obvious. We evaluate two possible routes to mathematics and argue that neither is sufficient: (1) We first sketch what we think is the most likely model for infant abilities in this domain, and we examine proposals for extrapolating the natural number concept from these beginnings. Proposals for arriving at natural number by (empirical) induction presuppose the mathematical concepts they seek to explain. Moreover, standard experimental tests for children's understanding of number terms do not necessarily tap these concepts. (2) True concepts of number do appear, however, when children are able to understand generalizations over all numbers; for example, the principle of additive commutativity (a+b=b+a). Theories of how children learn such principles usually rely on a process of mapping from physical object groupings. But both experimental results and theoretical considerations imply that direct mapping is insufficient for acquiring these principles. We suggest instead that children may arrive at natural numbers and arithmetic in a more top-down way, by constructing mathematical schemas.

No abstract

No abstract

No abstract