Fig. 3.

During movement sense testing, subjects were seated in a KinCom dynamometer with the neck positioned in 50% flexion or extension. The cushioned arm of the machine was positioned behind the head such that its centre of rotation was aligned with the approximate centre of the C7–T1 intervertebral disc. Subjects were secured using shoulder and waist straps, and wore a blindfold and headphones to eliminate audio-visual cues. Volunteers pressed a hand-held trigger upon detection of head movement.