15th International Congress of Phonetic Sciences (ICPhS-15)
Three male American English talkers spoke words that differed in lexical
stress, and sentences that differed in phrasal stress, while video
and movements of the face were recorded. In a production study, stressed
vs. unstressed syllables from these utterances were compared along
many measures of facial movement, which were generally larger and faster.
In a visual perception study, 16 perceivers identified the location of stress in forced-choice judgments of video clips of these utterances (without audio). Phrasal stress (54% correct vs. 25% chance) was better-perceived than lexical (62% correct vs. 50% chance). The relation of visual intelligibility to the optical characteristics of production is discussed.
Bibliographic reference. Keating, Patricia A. / Baroni, Marco / Mattys, Sven / Scarborough, Rebecca / Alwan, Abeer / Auer, Edward T. / Bernstein, Lynne E. (2003): "Optical phonetics and visual perception of lexical and phrasal stress in English", In ICPhS-15, 2071-2074.