What is the main use of pneumotachograph in speech science?

The main use of a pneumotachograph in speech science is to measure airflow during speech tasks. This device assesses the rate and volume of airflow that passes through it, providing valuable data on the respiratory aspects of speech production. By measuring airflow, researchers and clinicians can gain insights into how breathing patterns relate to speech production, which is critical for understanding vocal efficiency, control, and overall respiratory function during speaking.

Using a pneumotachograph allows for the analysis of how different speech tasks impact airflow dynamics, which can uncover various patterns in normal and disordered speech. This understanding can inform treatment approaches for individuals with speech difficulties related to airflow control.

The other options, while significant in the broader context of speech science, do not pertain to the specific function of the pneumotachograph. For instance, assessing vocal fold length, viewing vocal folds directly, and analyzing chest wall movement are different aspects of voice and speech analysis involving other tools and methodologies.