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One way to understand the relationship between speech perception and production is to examine cases where the two dissociate. This study investigates the hypothesis that perceptual acuity reflected in event-related potentials (ERPs) to rise time of sound amplitude envelope and pitch contour (reflected in the mismatch negativity, MMN) may associate with individual differences in production among speakers with otherwise comparable perceptual abilities. To test this hypothesis, we took advantage of an on-going sound change – tone merging in Cantonese, and compared the ERPs between two groups of typically-developed native speakers who could discriminate the high rising and low rising tones with equivalent accuracy but differed in the distinctiveness of their production of these tones. Using a passive oddball paradigm, early positive-going EEG components to rise time and MMN to pitch contour were elicited during perception of the two tones. Significant group differences were found in neural responses to rise time rather than pitch contour. More importantly, individual differences in efficiency of tone discrimination in response latency and magnitude of neural responses to rise time were correlated with acoustic measures of F0 offset and rise time differences in productions of the two rising tones.published_or_final_versio

Individual differences in processing pitch contour and rise time in adults: A behavioral and electrophysiological study of Cantonese tone merging