Children’s gender accurately identified from their speech: Since young boys & girls overlap almost entirely in gross acoustic cues that drive gender perception for adults, results suggest accuracy based on transmission of more subtle gender information

Perception of gender in children's voices. Santiago Barreda and Peter F. Assmann. The Journal of the Acoustical Society of America 150, 3949 (2021), Nov 23 2021. https://doi.org/10.1121/10.0006785

Abstract: To investigate the perception of gender from children's voices, adult listeners were presented with /hVd/ syllables, in isolation and in sentence context, produced by children between 5 and 18 years. Half the listeners were informed of the age of the talker during trials, while the other half were not. Correct gender identifications increased with talker age; however, performance was above chance even for age groups where the cues most often associated with gender differentiation (i.e., average fundamental frequency and formant frequencies) were not consistently different between boys and girls. The results of acoustic models suggest that cues were used in an age-dependent manner, whether listeners were explicitly told the age of the talker or not. Overall, results are consistent with the hypothesis that talker age and gender are estimated jointly in the process of speech perception. Furthermore, results show that the gender of individual talkers can be identified accurately well before reliable anatomical differences arise in the vocal tracts of females and males. In general, results support the notion that the transmission of gender information from voice depends substantially on gender-dependent patterns of articulation, rather than following deterministically from anatomical differences between male and female talkers.