Voice, as a secondary sexual characteristic, is known to affect the perceived attractiveness of human individuals. But the underlying mechanism of vocal attractiveness has remained unclear. Here, we presented human listeners with acoustically altered natural sentences and fully synthetic sentences with systematically manipulated pitch, formants and voice quality based on a principle of body size projection reported for animal calls and emotional human vocal expressions. The results show that male listeners preferred a female voice that signals a small body size, with relatively high pitch, wide formant dispersion and breathy voice, while female listeners preferred a male voice that signals a large body size with low pitch and narrow formant dispersion. Interestingly, however, male vocal attractiveness was also enhanced by breathiness, which presumably softened the aggressiveness associated with a large body size. These results, together with the additional finding that the same vocal dimensions also affect emotion judgment, indicate that humans still employ a vocal interaction strategy used in animal calls despite the development of complex language.

Aim: In this study, we examine the production of Cantonese tones by preschool Urdu–Cantonese children living in Hong Kong. Methodology: 21 first language Urdu second language Cantonese children (ages 4–6) and 20 age-matched first language Cantonese children participated in a picture-naming experiment with 86 words (109 syllables in total). Data and Analysis: Acoustic analysis was carried out for perceptually correct and incorrect tone productions of each tone. Comparisons were also made across speaker groups regarding accuracy rates and error patterns. Findings: Overall, first-language Urdu participants had lower accuracy and greater tone confusion than first language Cantonese participants. The pattern is attributable to influence from Urdu prosody, ongoing Cantonese tone mergers, and general sensitivity to phonetic information. Originality: This is the first empirical study on the acquisition of Cantonese tones by children who are heritage speakers of a non-tone language. Significance: This study extends the literature of early bilingual phonology by furthering our understanding of an under-studied bilingual population, that is, heritage children of a non-tone language acquiring a tone language as the majority language. The findings of this study also produce implications for the practice of language educators and speech therapy professionals working with bilingual children.

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