Beschreibung:
<jats:p>One major cause for speech production variability and errors is competition between phonologically similar sequences in an utterance. Since one recent model of speech production planning [Nam (2004)] also posits a systematic relation between planning time and kinematic variability, we decided to directly investigate whether competition increases planning time, i.e., whether it takes longer to initiate a sequence such as “tape cape” compared with “tape tape.” Effects of competition in the onset were compared to competition in the coda (e.g., “tape take”). Results from two studies are reported: articulatory latencies from a delayed naming task recorded using EMA (four speakers), and acoustic latencies from a delayed naming task, a simple naming task, and a picture naming task (ten speakers). Latencies were significantly affected by competition, i.e., latencies were longer for items like “tape cape” and “tape take” than for “tape tape.” However, no significant differences were found in competition effects between onset and coda positions. Apart from latency, overall duration increased and clusters formed across words showed less overlap. Observed effects on latency were largest for picture naming, followed by simple naming and least for delayed naming. [Work supported by NIH DC008780.]</jats:p>