What is electroglottography (EGG) primarily used for?

Electroglottography (EGG) is primarily used for assessing vocal fold activity by providing a means to visualize their movement during phonation. It works by measuring the electrical conductance between electrodes placed on the neck, which reflects the degree of contact between the vocal folds as they open and close.

This method is particularly useful in tracking changes in fundamental frequency, or pitch, because it captures the rapid cycles of vocal fold vibration in real time. By analyzing these cycles, clinicians and researchers can determine the fundamental frequency of the voice, which is crucial in the study of voice disorders and the development of treatment strategies.

While other options suggest important aspects of speech production, they do not fully encompass the main utility of EGG, which is directly tied to the analysis and visualization of vocal fold movement and its relation to frequency. The focus on fundamental frequency makes it a key tool in voice analysis and therapy, distinguishing it from other measurements like airflow or tongue movement.