title: Conversational and clear speech intelligibility of /bVd/ syllables produced by native and non-native English speakers.
abstract: The ability of native and non-native speakers to enhance intelligibility of target vowels by speaking clearly was compared across three talker groups: monolingual English speakers and native Spanish speakers with either an earlier or a later age of immersion in an English-speaking environment. Talkers produced the target syllables "bead, bid, bayed, bed, bad" and "bod" in 'conversational' and clear speech styles. The stimuli were presented to native English-speaking listeners in multi-talker babble with signal-to-noise ratios of -8 dB for the monolingual and early learners and -4 dB for the later learners. The monolinguals and early learners of English showed a similar average clear speech benefit, and the early learners showed equal or greater intelligibility than monolinguals for most target vowels. The 4-dB difference in signal-to-noise ratio yielded approximately equal average intelligibility for the monolinguals and later learners. The average clear speech benefit was smallest for the later learners, and a significant clear speech decrement was obtained for the target syllable "bid." These results suggest that later learners of English as a second language may be less able than monolinguals to accommodate listeners in noisy environments, due to a reduced ability to improve intelligibility by speaking more clearly.
authors.affiliation: Department of Communication Sciences and Disorders, University of South Florida, 4202 E. Fowler Avenue, PCD1017, Tampa, Florida 33620, USA. crogers@bcs.usf.edu
authors.forename: Catherine L
authors.initials: CL
authors.lastname: Rogers
authors.forename: Teresa M
authors.initials: TM
authors.lastname: DeMasi
authors.forename: Jean C
authors.initials: JC
authors.lastname: Krause
mesh_terms: D000161:Acoustic Stimulation; D000293:Adolescent; D000328:Adult; D032882:Comprehension; D006801:Humans; D007802:Language; D007858:Learning; D008875:Middle Aged; D009622:Noise; D010470:Perceptual Masking; D010699:Phonation; D017603:Signal Detection, Psychological; D013061:Speech Acoustics; D013065:Speech Intelligibility; D055815:Young Adult