CASL
Permanent URI for this collectionhttps://eresearch.qmu.ac.uk/handle/20.500.12289/22
Browse
2 results
Search Results
Item Complex patterns in silent speech preparation: Preparing for fast response might be different to preparing for fast speech in a reaction time experiment(International Phonetic Association, 2015-08-15) Schaeffler, Sonja; Scobbie, James M.; Schaeffler, FelixThis paper presents articulatory data on silent preparation in a standard Verbal Reaction Time experiment. We have reported in a previous study [6] that Reaction Time is reliably detectable in Ultrasound Tongue Imaging and lip video data, and between 120 to 180 ms ahead of the standard acoustics-based measurements. The aim of the current study was to investigate in more detail how silent speech preparation is timed in relation to faster and slower Reaction Times, and faster and slower articulation rates of the verbal response. The results suggest that the standard acoustic-based measurements of Reaction Time may not only routinely underestimate fastness of response but also obscure considerable variation in actual response behaviour. Particularly tokens with fast Reaction Times seem to exhibit substantial variation with respect to when the response is actually initiated, i.e. detectable in the articulatory data.Item Measuring reaction times: Vocalisation vs. articulation(2014-05-09) Schaeffler, Sonja; Scobbie, James M.; Schaeffler, Felix; Fuchs, S.; Grice, M.; Hermes, A.; Lancia, L.; Mücke, D.There is a sizeable delay between any formulation of an intention to speak and the audible vocalisation that results. Silent articulatory movements in preparation for audible speech comprise a proportion of this phase of speech production. The extensive literature on Reaction Time (RT) is based on the delay between a stimulus and the acoustic onset to speech that is elicited, ignoring the preceding silent elements of speech production in what is an utterance-initial position. We used a standard Snodgrass and Vanderwart picture-naming task to elicit speech in a standard Reaction Time protocol, but recorded the behaviour of two typical speakers with audio plus Ultrasound Tongue Imaging (201 frames per second) and de-interlaced NTSC video of the mouth and lips (60fps). On average, acoustic RT occurred between 120 to 180 ms later than a clearly observable articulatory movement, with no consistent advantage for lip or tongue-based measures.