This study evaluated whether age effects on second language (L2) speech learning derive from changes in how the native language (L1) and L2 sound systems interact. According to the "interaction hypothesis" (IH), the older the L2 learner, the less likely the learner is able to establish new vowel categories needed for accurate L2 vowel production…

Outlines an approach for studying auditory levels in speech perception, focusing on the artificial speech understanding system that is most compatible with the experimental data obtained in speech perception research. (RL)

Augments Michael Studdert-Kennedy's state-of-the-art report on speech perception research (EJ 227 656) with comments on categorical perception of speech and nonspeech stimuli, speech perception in context, the role of prosody, and development/impairments of speech perception. Includes a summary of a discussion on speech perception research. (RL)

Two experiments used a magnitude estimation paradigm to test whether perception of disfluency is a function of whether the speaker and the listener stutter or do not stutter. Utterances produced by people who stutter were judged as "less fluent," and, critically, this held for apparently fluent utterances as well as for utterances…

Indicates that native and nonnative speakers alike can make use of intonation if they explicitly listen for it, although prosodic features are generally ignored when other cues (semantic and pragmatic) are available. (Author/RL)

Using standard classical conditioning and concept-formation paradigms, research showed that all phones of a phoneme were considered "the same" by linguistically naive speakers. Results also supported the notion of the phoneme as a unit that functions in speech perception. (RL)

Describes some of the difficulties involved in conducting language evaluation tests in Edinburgh, Scotland. Reports some results of a pilot study. (RL)

Reviews research on prosody and segmental perception, segmentation and invariance, categorical perception of speech and nonspeech, feature detectors, scaling speech sounds to an auditory-articulatory space, acoustic-phonetic dependencies within the syllable, higher order (nonphonetic) factors in the comprehension of fluent speech, and cerebral…

We describe two experiments on signaling and detecting uncertainty in audiovisual speech by adults and children. In the first study, utterances from adult speakers and child speakers (aged 7-8) were elicited and annotated with a set of six audiovisual features. It was found that when adult speakers were uncertain they were more likely to produce…