Cross-Gender Differences in English/French Bilingual Speakers: A Multiparametric Study

The present study concerns speech productions of female and male English/French bilingual speakers in both reading and semi-spontaneous speech tasks. We investigated various acoustic parameters: average fundamental sound frequency (F0), F0 range, F0 variance (SD), vowel formants (F1, F2, and F3), voice onset time (VOT) and H1-H2 (intensity difference between the first and the second harmonic frequencies, used to measure phonation type) in both languages. Our results revealed a significant effect of gender and language on all parameters. Overall, average F0 was higher in French while F0 modulation was stronger in English. Regardless of language, female speakers exhibited higher F0 than male speakers. Moreover, the higher average F0 in French was larger in female speakers. On the other hand, the smaller F0 modulation in French was stronger in male speakers. The analysis of vowel formants showed that overall, female speakers exhibited higher values than males. However, we found a significant cross-gender difference on F2 of the back vowel [u:] in English, but not on the vowel [u] in French. VOT of voiceless stops was longer in Female speakers in both languages, with a greater difference in English. VOT contrast between voiceless stops and their voiced counterparts was also significantly longer in female speakers in both languages. The scope of this cross-gender difference was greater in English. H1-H2 was higher in female speakers in both languages, indicating a breathier phonation type. Furthermore, female speakers tended to exhibit smaller H1-H2 in French, while the opposite was true in males. This resulted in a smaller cross-gender difference in French for this parameter. All these data support the idea of language- and gender-specific vocal norms, to which bilingual speakers seem to adapt. This constitutes a further argument to give social factors, such as gender dynamics, more consideration in phonetic studies.