We study the effect that phonetic onset has on acousticudand articulatory reaction times. An acousticudstudy by Rastle et al. (2005) shows that the placeudand manner of the first consonant in a target affectsudacoustic RT. An articulatory study by Kawamoto etudal. (2008) shows that the same effect is not presentudin articulatory reaction time of the lips. We hypothesise,udtherefore, that in a replication with articulatoryudinstrumentation for the tongue, we should find theudsame acoustic effect, but no effect in the articulatoryudreaction time. As a proof of concept of articulatoryudmeasurement from ultrasound images, we report resultsudfrom a pilot experiment which also extends theuddataset to include onset-less syllables. The hypothesisudis essentially confirmed with statistical analysisudand we explore and discuss the effect of differentudvowels and onset types (including null onsets) on articulatoryudand acoustic RT and speech production.
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