Sodium Oxybate in Spasmodic Dysphonia and Voice Tremor

Inclusion Criteria: 1. Patients with SD and combined SD and VT will have a clinically documented adductor or abductor form of disorder, either with or without positive effects of alcohol on their voice symptoms; 2. Healthy controls will be healthy volunteers with a negative history of laryngeal, neurological, or psychiatric problems (existing neuroimaging data will be used); 3. Age from 21 to 80 years. 4. Native English speakers. 5. Right-handedness (based on Edinburgh Handedness Inventory). Exclusion Criteria: 1. Subjects who are incapable of giving an informed consent will be excluded from the study. 2. Pregnant and breastfeeding women until a time when they are no longer pregnant or breastfeeding will be excluded from the study. All patients of childbearing potential will be required to agree to use a reliable method of contraception prior to and during the study. The method of contraception will be documented in the patient's research chart. All women of childbearing potential will undergo a urine pregnancy test, which must be negative for study participation. 3. All patients with a past or present history of the following conditions will be excluded from the study; 1. Except for SD and dystonic VT, any neurological disorders, such as stroke, movement disorders, brain tumors, traumatic brain injury with loss of consciousness, ataxias, myopathies, myasthenia gravis, demyelinating diseases, alcoholism, drug dependence. Patients with tremor affecting other body parts will be excluded from the study. All patients who have dystonic movements in the body regions other than the larynx will be excluded from the study. This will allow maintaining the homogenous patient population and evaluating central drug effects without confounding by the presence of other neurological conditions. 2. Any psychiatric problems, such as schizophrenia, major and/or bipolar depression, obsessive-compulsive disorder, will be excluded to maintain the homogenous patient population and allow for the evaluation of central drug effect without confounding by the presence of psychiatric conditions. 3. Any laryngeal problems, such as vocal fold paralysis, paresis, carcinoma, chronic laryngitis, will be excluded from the study. 4. Patients with a known past or present history of grade 2 or higher hepatic and renal dysfunction according to the NCI criteria will be excluded. 5. Patients with a known past or present history of moderate to severe congestive heart failure will be excluded. 6. Patients with a known past or present history of cognitive impairment and active suicidal ideations will be excluded. 4. Patients who are not symptomatic due to treatment with botulinum toxin injections into the laryngeal muscles will be excluded from the study until the time when they are fully symptomatic. The duration of positive effects of botulinum toxin vary from patient to patient, lasting on average 3-4 months. All patients will be evaluated to ensure that they are fully symptomatic prior to the entering the study. 5. To avoid the possibility of confounding effects of drugs acting upon the central nervous system, all patients will be questioned about any prescribed or over-the-counter medications as part of their initial intake screening. Those patients who receive medication(s) affecting the central nervous system (except for sodium oxybate) will be excluded from the study. 6. Patients will be asked whether they have undergone any head and neck surgeries, particularly any brain surgery and laryngeal surgeries, such as thyroplasty, laryngeal denervation, and selective laryngeal adductor denervation-reinnervation. Because both brain and laryngeal surgery may potentially lead to the brain structure and function re-organization, all subjects with a history of brain and/or laryngeal surgery will be excluded from the study. 7. Patients who have tattoos, ferromagnetic objects in their bodies (e.g., implanted stimulators, surgical clips, prosthesis, artificial heart valve, etc.) that are not MRI comparable and/or cannot be removed for the purpose of MRI study participation will be excluded from the study.