During examination of a person with “dizziness”, the physica…

During examination of a person with “dizziness”, the physical therapist completes a test with the patient sitting on a swivel chair. The therapist instructs the patient to extend their arms in front of them and maintain visual fixation on their thumbnail. The therapist then rotates the person in the chair, keeping their head and trunk in alignment. Which test of vestibular function does this procedure describe?