Which type of measurement can an electromyography (EMG) provide in speech analysis?

Electromyography (EMG) is a technique used to assess the electrical activity of muscles, which is particularly relevant in speech analysis for understanding muscle function during articulation. EMG provides insights into how muscles involved in speech production, such as those in the tongue, lips, and larynx, are activated when producing sounds. This measurement can help researchers and clinicians analyze patterns of muscle engagement that occur during different speech tasks, allowing for a better understanding of both normal and disordered speech production.

In contrast, the other options focus on different aspects of speech that are not measured by EMG. Visual representation of sound waves pertains to acoustic analysis, while air pressure measurements relate to the airflow and pressure dynamics during speech. Chest displacement during breathing is related to respiratory function and not specifically to muscle activity in articulation. Thus, the capability of EMG to specifically monitor muscle activation makes it a valuable tool in the field of speech sciences.