For testing of restriction to motion of the temporal bones, the examiner and the patient remained in the same relative positions as aforementioned. The patient's occiput was gently cradled in the examiner's interlaced fingers (hands palms up). The examiners thumbs were positioned so that they were in contact with the temporal mastoid processes and tips. First, a side-to-side motion was gently induced so that when one mastoid tip was pressed medially, the opposite tip was allowed to move freely in a lateral direction and vice versa. The motions were tested in rhythm with the cranial rhythmic impulse (CR1). Several excursions were monitored. Then, resistance to a very minute circular motion of the temporal bones was tested. The axis of this motion can be conceptualized as running through the external auditory canal and through the petrous portion of the temporal bone. Resistance to these examiner-induced motions was rated on each side in terms of its severity. Before terminating this temporal bone testing, symmetry of motion was restored by the examiner.