According to my research on various studies conducted by medical professionals, I can say that based on the information provided within the question this is an example of the accessory motion called Arthrokinematics. This is when a a specific point on one articulating surface comes in contact with a series of points on another surface. Like seen in the picture below.
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Answer: a therapist benefits from studying psychology because it help them get a better understanding of the people they’re working with. A School counselor it gives them an advantage on talking to their students.