 The 2 randomly assigned interventions are: cervical manipulation, or cervical contact. If assigned the manipulation, volunteers will lie face up and the trained therapist will move the joints in the neck in a gentle, but short and sharp manner which may produce a slight pop or click. If volunteers are assigned the cervical contact, they will lie on their back and the trained therapist will gently hold the head and neck for 45 to 60 seconds as they quietly relax. 