Speech discrimination in the language-innocent and the language-wise: a study in the perception of voice onset time

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Abstract
Discrimination of synthetically produced stimuli differing along the voice onset time continuum was assessed for infants and adults within the context of the Visually Reinforced Infant Speech Discrimination (VRISD) paradigm. English-learning infants' discrimination abilities were compared with two groups of English-speaking adults (a phonetically naive and a phonetically sophisticated group). Contrary to the predictions of the innateness hypothesis, English-learning infants showed evidence of discrimination only across the English phoneme boundary. Adults, on the other hand, were very successful in discriminating both across and within a range of phoneme boundaries. These results are discussed in terms of the presumed relationship between categorical perception and linguistic processing and in terms of synthetic speech continua.