Which tool uses metallic pellets to measure articulatory movements in real-time?

The use of metallic pellets to measure articulatory movements in real-time is a key feature of X-Ray Microbeam. This technology involves the placement of small metal markers on the speech articulators, such as the tongue and lips. When X-rays are directed at these markers, their movement can be tracked with high precision, allowing researchers and clinicians to analyze the dynamic movements involved in speech production in real-time.

X-Ray Microbeam provides a detailed and accurate depiction of the articulation process, allowing for the observation of complex movements that occur within the speech mechanism. This capability is particularly important in speech science research, as it enables a better understanding of speech production and the assessment of various speech disorders.

Other options like Electromagnetic Articulography utilize electromagnetic fields to track the movement of sensors but do not employ metallic pellets specifically. Electropalatography involves the use of a custom-made palate with electrodes to measure contact between the tongue and the roof of the mouth, while Surface EMG records electrical activity from muscles and is not directly related to tracking articulatory movement in the same manner as X-Ray Microbeam.