Adult students of foreign languages frequently claim that native speakers of that language speak too rapidly. This is likely a result of the students’ failure to achieve automaticity in recognition of speech sounds necessary for effortless speech perception. Research on the time course of auditory perceptual learning for both speech and non-speech sounds provides strong evidence that adults can, with appropriate training, achieve perceptual skills approximating those of native speakers, although they only rarely do so. Among the few adults who do achieve near-native conversational skills in an L2, many have had intensive recognition practice and training. The Speech Perception Assessment and Training System for students of English as a Second Language (SPATS-ESL) of CDT, Inc. provides such training. SPATS-ESL trains the identification of the 109 most common English syllable constituents (onsets, nuclei, and codas) and the recognition of meaningful sentences spoken by a variety of native speakers. Based on experience with over 200 ESL learners it has been found that near-native performance in the recognition of discrete English speech sounds and meaningful sentences spoken by many talkers is acquired by most ESL students after 15-30 hours of individualized computer-based training. (Watson and Miller are stockholders in CDT, Inc.)
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