Developmental and cultural factors of audiovisual speech perception in noise
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The aim of this project is two-fold: 1) to investigate developmental differences in intelligibility gains from visual cues in speech perception-in-noise, and 2) to examine how different types of maskers modulate visual enhancement across age groups. A secondary aim of this project is to investigate whether or not bilingualism differentially modulates audiovisual integration during speech in noise tasks. To that end, both child and adult, monolingual and bilingual participants completed speech perception in noise tasks through three within-subject variables: (1) masker type: pink noise or two-talker babble, (2) modality: audio-only (AO) and audiovisual (AV), and (3) Signal-to-noise ratio (SNR): 0 dB, -4 dB, -8 dB, -12 dB, and -16 dB. The findings revealed that, although both children and adults benefited from visual cues in speech-in-noise tasks, adults showed greater benefit at lower SNRs. Moreover, although child monolingual and bilingual participants performed comparably across all conditions, monolingual adults outperformed simultaneous bilingual adult participants. These results may indicate that the divergent use of visual cues in speech perception between bilingual and monolingual speakers occurs later in development.