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Gestural De-Aggregation via Prosodic Structure

It has been proposed that when two gestures involving the same articulator are organized with sufficient overlap, the resulting ‘gestural aggregation’ blends or averages the two movements to result in a smooth, often plateau-like kinematic trajectory (Munhall & Löfqvist 1992). We analyze the effects of a phrasal boundary on sequences of two consonants across a word boundary. Prosodic structure has been shown to affect the temporal overlap among gestures (Byrd et al. 2000). Given the overlap account of gestural aggregation, we expect the case of juncture geminates—two identical sequential consonants—to be influenced by prosodic structure in a similar fashion as other coproduced gestures are. In fact, our results show that, as expected, the overlapped gestures are temporally pulled apart or deaggregated across a phrase boundary. [Supported by NIH DC 03172]