title: Syllabic encoding during overt speech production in Cantonese: Evidence from temporal brain responses.
abstract: The time course of phonological encoding in overt Cantonese disyllabic word production was investigated using a picture-word interference task with concurrent recording of the event-related brain potentials (ERPs). Participants were asked to name aloud individually presented pictures and ignore a distracting Chinese character. Participants' naming responses were faster, relative to an unrelated control, when the distractor overlapped with the target's word-initial or word-final syllables. Furthermore, ERP waves in the syllable-related conditions were more positive-going than those in the unrelated control conditions from 500ms to 650ms post target onset (i.e., a late positivity). The mean and peak amplitudes of this late positivity correlated with the size of phonological facilitation. More importantly, the onset of the late positivity associated with word-initial syllable priming was 44ms earlier than that associated with word-final syllable priming, suggesting that phonological encoding in overt speech runs incrementally and the encoding duration for one syllable unit is approximately 44ms. Although the size of effective phonological units might vary across languages, as suggested by previous speech production studies, the present data indicate that the incremental nature of phonological encoding is a universal mechanism.
authors.affiliation: Nam Shan Psychology Laboratory, Department of Applied Social Sciences, City University of Hong Kong, Nam Shan Chuen Road, Kowloon, Hong Kong, China. Electronic address: andus.wong@cityu.edu.hk.
authors.forename: Andus Wing-Kuen
authors.initials: AW
authors.lastname: Wong
authors.affiliation: Department of Psychology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China. Electronic address: jwang@psy.cuhk.edu.hk.
authors.forename: Jie
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of Psychology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China. Electronic address: htyng@psy.cuhk.edu.hk.
authors.forename: Tin-Yan
authors.initials: TY
authors.lastname: Ng
authors.affiliation: Department of Psychology, The Chinese University of Hong Kong, Shatin, N.T., Hong Kong, China. Electronic address: hcchen@psy.cuhk.edu.hk.
authors.forename: Hsuan-Chih
authors.initials: HC
authors.lastname: Chen
mesh_terms: D001921:Brain / Q000502:physiology; D004569:Electroencephalography / Q000379:methods; D005071:Evoked Potentials / Q000502:physiology; D005260:Female; D006801:Humans; D007802:Language; D008297:Male; D010700:Phonetics; D011930:Reaction Time / Q000502:physiology; D011932:Reading; D012660:Semantics; D013060:Speech / Q000502:physiology*; D013997:Time Factors; D055815:Young Adult
keywords: Cantonese speech production; Event-related brain potentials (ERP); Phonological encoding