What is a strain gauge primarily used for in speech science?

A strain gauge is a device that measures the amount of deformation or strain experienced by an object when force is applied. In speech science, it is primarily used to record lip and jaw displacement. This capability is crucial for understanding the mechanics of speech production, including how articulators move during the production of different sounds. By accurately measuring these movements, researchers and clinicians can analyze the coordination and function of the oral mechanism, which plays a significant role in articulating speech.

Other options do not align with the function of strain gauges. For instance, while analyzing vocal pitch involves assessing frequency levels produced during speech, this typically requires different tools, such as microphones and spectrograms. Visualizing brain activity relies on imaging technologies, such as fMRI or EEG, rather than strain gauges. Similarly, measuring airflow during phonation requires devices like pneumotachographs, which are designed to assess the airflow characteristics essential for voice production. Thus, the application of strain gauges in measuring lip and jaw displacement stands out as its primary function in speech science.