Acoustic and Aerodynamic Features of Hadza Clicks

International audience Hadza has 4 clicks in its sound inventory: bilabial,dental, alveolar and lateral [ʘ, |, !, ‖] that can beaspirated, glottal and nasal [ʘ̰ , |ʔ, |h, ɴ|, ɴ|ʔ, !ʔ, !h, ɴ!, ɴ!ʔ,‖, ‖h, ɴ‖h, ɴ‖ʔ]. The bilabial click [ʘ] has a noisy releaseand is defined as [grave & noisy]. Acoustically theoral clicks [|, !, ‖] are described with 2 features [gravevs. acute] and [abrupt vs. noisy]. The [grave] featuredefining the alveolar click [!] has a peak in the FFTspectrum around 2 kHz. The [acute] feature definingthe dental and lateral clicks [|, ‖] has a peak around 6kHz for the dental and an emphasis in frequenciesbetween 4 & 5 kHz for the lateral click (all peaks inrounded values). The difference between the [abrupt][!, ‖] also has a duration component, i.e. short burst vsshort noise band.