Patient description: A 5-year-old boy presents to the emergency department with complaints of progressively worsening dysphagia, drooling, fever and vocal changes. He is toxic-appearing, and leans forward while sitting on his mother's lap. He is drooling and speaks with a muffled "hot potato" voice. The parents deny the possibility of foreign body ingestion or trauma, and they report that they are delaying some of his vaccines.

Clinical trial eligibility criteria: eligible ages (years): 20.0-70.0,  Voice Disorders The for normal volunteers are normal vocal function and average health as determined by the staff otolaryngologist. Normal vocal function refers to normal voice quality, a negative history for voice or laryngeal disorders. Persons with significant pulmonary, neurological and psychiatric function will not be recruited. The primary for the voice disordered groups are a current diagnosis of spasmodic dysphonia (abductor or adductor type), muscular tension dysphonia or voice tremor. These persons will not have pulmonary, neurological or psychiatric disorders or criteria for Patients with Spasmodic Dysphonia Intermittent strained hoarseness, uncontrolled voice breaks or changes in pitch are present during vowels, liquids (r & l) and semi-vowels (w & y), during speech for adductor SD or prolonged voiceless consonants producing breathy breaks for abductor SD Less prominent symptoms during whisper, singing or falsetto Normal voice and vocal fold movement for protective and emotional laryngeal function, such as cough, laugh or cry A diagnosis of adductor or adductor spasmodic dysphonia based on voice testing and fiberoptic nasolaryngoscopy by a board certified otolaryngologist and Speech-Language Pathologist during the initial interview of other laryngeal pathologies based on a fiberoptic nasolaryngoscopic examination conducted during the initial interview by the staff otolaryngologist for Patients with Muscular Tension Dysphonia Increased phonatory muscle tension in the paralaryngeal and suprahyoid muscles on palpation A consistent hypertonic laryngeal posture for phonation, such as either an anterior-posterior squeeze (pin-hole posture) or ventricular hyper adduction and an absence of SD or vocal tremor as determined by a Speech-Language Pathologist and the staff otolaryngologist  Any individual with a history of one or more of the following contraindications will be excluded from the study Airway obstruction, smoking or tobacco use Pulmonary, or neurological disease Pregnancy as reported by the volunteer or a positive pregnancy result from a urine sample obtained on the day of testing Psychiatric disorder, under psychiatric care, or on medication for psychiatric disorders. Examples of psychiatric disorders to be excluded are: somatoform disorders, conversion disorders, major depression, schizophrenia or a bipolar disorder. A history of a previous episode of minor reactive depression would not a person from participation Speech or hearing problems as determined by medical history and examination by the otolaryngologist. A 30 dB HL hearing screening between 500 and 3000 Hz will be conducted if subjects report difficulty following spoken instructions or significant noise exposure A reduction in the range of vocal fold movement during non-speech tasks such as whistling suggesting either paralysis or paresis, joint abnormality or neoplasm as determined by videolaryngoscopic examination by the staff otolaryngologist Complete aphonia, a history of airway obstruction or structural abnormalities affect the larynx such as vocal fold nodules, polyps, carcinoma, cysts, contact ulcers, chronic laryngitis as determined by videolaryngoscopic examination by the staff otolaryngologist Individuals having any condition that would present unnecessary risk to them, e.g., claustrophobia Specific contraindications for magnetic resonance imaging i) Any implant or surgical clip