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...

In the experiments reported in this paper we compared the effects of syllable-level and sentence-level speaking rate on phonetic perception. In an earlier set of experiments, we found that syllable-level rate influences the internal perceptual structure of phonetic categories [Miller and Volaitis, Percept. Psychophys. 46, 505-512 (1989); Volaitis and Miller, J. Acoust. Soc. Am. 92, 723-735 (1992)]. Specifically, a change in target-syllable rate altered the location of the stimuli judged to be the best category exemplars, as well as the width of this best-exemplar range. In the present investigation, it was asked whether sentence-level rate has the same influence. It was found that slowing sentence rate shifted the location of the best-exemplar range, but did not alter its width. These findings are discussed in terms of timing mechanisms that may operate during speech perception.

In this experiment, young and elderly adults listened to and recalled sentences that were varied in speech rate through computer-controlled time compression. Half of the sentences at each speech rate were presented with a normal prosodic pattern that reinforced the lexically defined syntactic structure of the sentences, and half were presented with a prosodic contour that conflicted with that structure. Both young and elderly subjects showed better recall for slower speech rates and when prosody was consistent with syntactic structure, but these effects were larger for elderly subjects. When syntax and prosody were placed in conflict, elderly subjects were more likely than the young to reconstruct the lexical content of the presented sentences to produce responses with a syntactic structure consistent with the prosody marking. Although elderly adults may be disadvantaged by rapid speech input rates, we show that they rely on normal prosody to aid syntactic parsing as a step toward language comprehension.

We investigated the conditions under which the [b]-[w] contrast is processed in a context-dependent manner, specifically in relation to syllable duration. In an earlier paper, Miller and Liberman (1979) demonstrated that when listeners use transition duration to differentiate [b] from [w], they treat it in relation to the duration of the syllable: As syllables from a [ba]-[wa] series varying in transition duration become longer, so, too, does the transition duration at the [b]-[w] perceptual boundary. In a subsequent paper, Shinn, Blumstein, and Jongman (1985) questioned the generality of this finding by showing that the effect of syllable duration is eliminated for [ba]-[wa] stimuli that are less schematic than those used by Miller and Liberman. In the present investigation, we demonstrated that when these "more natural" stimuli are presented in a multi-talker babble noise instead of in quiet (as was done by Shinn et al.), the syllable-duration effect emerges. Our findings suggest that the syllable-duration effect in particular, and context effects in general, may play a more important role in speech perception than Shinn et al. suggested.

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