Antioxidant and cholinergic neuroprotective mechanisms in experimental parkinsonism.

Many instruments have been employed in recent years in order to quantify the posture and motion of the head in normal and pathological subjects. Evaluations of this type present many difficulties related to the influence of individual and external factors and to the accuracy of the system used. In patients with cervical dystonia (CD) the only rating scales currently used are semi-quantitative and subjective. Mor e precise information on disease severity and response torapeutic ron improvement and the restriction of motion before treatment.