Locality interactions with prominence in determining the scope of phrasal lengthening

Temporal lengthening of gestures and segments located in a boundary-adjacent syllable has been found in both pre- and postboundary contexts. However, the temporal extent or scope of this lengthening, particularly in the articulatory domain, is not well described. We address the question of scope of prosodic lengthening by considering specifically whether prominence interacts with boundary-related articulatory lengthening in such a way that prominent elements not immediately at a phrase edge are lengthened relative to the same prominent elements phrase-medially (i.e. at a considerable distance from a boundary). Articulatory kinematic data were collected for three subjects to analyze consonant constrictions of prominent syllables located (1) either immediately before or after a boundary and (2) two and three syllables away from that boundary. The results indicate that, as expected, gestures undergo prosodic lengthening when immediately local to the phase boundary. However, some subjects did display prosodic lengthening at a small remove from the boundary for a prominent syllable. This effect was strongest in the postboundary condition. These results suggest that a consideration of prominence may be relevant in understanding the temporal patterning of boundary-related articulatory lengthening.