Prof. Takayuki Arai had the following presentation in the speech production session at INTERSPEECH 2021; videos related to the presentation were released.
Session：[Virtual] Speech Production Title：Vocal-tract models to visualize the airstream of human breath and droplets while producing speech
Visualization of aerosol during speech production using a head-shaped vocal-tract model with a lung model:
Lung pressure: high / Output: mouth
Lung pressure: low / Output: mouth It becomes clear that how far the aerosol reaches does not depend on the lung pressure.
Lung pressure: high / Output: mouth & nostril We can see that the two air streams from the mouth and the nostril merged and formed a more directional pattern.