Electrophysiological Study of the Effects of Limb Cooling on Essential Tremor

Inclusion Criteria: * Patients with clinical diagnosis of E.T. for at least a year by a movement disorder neurologist * A +2 or worse action or kinetic tremor of one or both upper limbs involving at least the forearm and/or hand * Ages 18 to 95 years old Exclusion Criteria: * (+) sensory loss in the upper extremities * dermatologic lesions in upper extremities (e.g. skin cancer, eczema, fresh or healing wounds, abrasions, acne, pustules, abscesses, or skin rash) * known history of sensitivity to cold (i.e., cold urticaria) * known peripheral vascular disease * Raynaud's phenomenon * scleroderma