Volume control of noise generator: Manual control of the noise
Velopharyngeal Dysfunction : Increased nasality in speech due to inadequate functioning of velum (soft palate).
Verbal Dyspraxia: Reduced ability in accomplishing the oral postures necessary movements’ production and the sequences of those postures for production of sounds, words, sentences, and/or conversation.
Voice Disturbance: Five categories that characterize the underlying causes of the majority of voice disorders; in decreasing order of frequency, Infectious and inflammatory conditions, Vocal misuse and abuse syndromes, Benign and malignant growths, Neuromuscular diseases, Psychogenic conditions.
Volume control : It adjusts the loudness setting in a hearing aid which adjusts the volume automatically or manually as the wearer moves from one listening environment to another.
Vertigo – Illusion of movement; a sensation as if the external world were revolving around an individual (objective vertigo) or as if the individual were revolving in space (subjective vertigo).
Vestibular System – System in the body that is responsible for maintaining balance, posture, and the body’s orientation in space. This system also regulates locomotion and other movements and keeps objects in visual focus as the body moves.
Vestibule – Bony cavity of the inner ear.
Variable release compression – compression technology which reduces volume in loud circumstances continuously until the sound falls below a predetermined decibel level. With a long, loud sound, release is delayed based on the decibel level entering the hearing aid. The benefit is that it virtually eliminates the “pumping” sound associated with peak clipping in more primitive compression circuits. This circuit helps the user obtain comfortable listening in various levels of noise.
Vent – a hole drilled the length of an ear mold or ITE shell to allow sound to escape.
Video otoscope – a miniaturized camera that the hearing processional inserts into the subject’s ear to view and photograph the ear canal and eardrum
Vocal Cord Paralysis – Inability of one or both vocal folds (vocal cords) to move because of damage to the brain or nerves. Vocal cord paresis (or paralysis) is weakness of one or both. .Symptoms of include s; vocal fatigue; mild to severe reduction in vocal volume; pain in the throat when speaking; shortness of breath; (food or liquids going down the trachea) with frequent resultant coughing, and in extreme cases may cause death. Gargling fluids may also become difficult. Vocal cord paresis can greatly impactt, job choice, and leisure time pursuits.
Reduced vocal cord mobility may decrease the effectiveness of coughing, swallowing, or sneezing in removing mucosal wastes from the laryngeal area. The resultant accumulations may allow for viral and bacterial colonization with an increased tendency for infections and throat discomfort.
Some causes of paresis includen;or compressing the recurrent laryngeal nerve; intramuscular tumor limiting vocal fold movementa; compression of the recurrent laryngeal nerve fromn, orx. Cardiac surgery represents a risk to normal voice function as the nerves serving the larynx are routed near the heart. Damage to this nerve during open heart surgery is not uncommon. The recurrent laryngeal nerve also runs in close proximity to the thyroid gland making hoarseness of voice due to partial paralysis an important side effect of thyroid surgery. Neurological diseases such as Parkinson’s can deteriorate vocal functions. Paresis may occur from an unknown cause (idiopathic).
Vocal paresis is diagnosed by observing the lack of (or reduced) motion of one or both cords using a laryngoscope. EMG (electromyography) may be used to measure the strength of the neuromuscular signal from the brain to the muscles controlling the vocal folds. This diagnosis can be made by a laryngologist or otolaryngologist with the assistance of a neurologist. In situations involving inflammation, recovery of normal motion of the vocal cords may return spontaneously.
Vocal Cords (Vocal Folds) – muscularized folds of mucous membrane that extend from the larynx (voice box) wall. The folds are enclosed in elastic vocal ligament and muscle that control the tension and rate of vibration of the cords as air passes through them.
Vocal Folds – See Vocal Cords above.
Voice – Sound produced by air passing out through the larynx and upper respiratory tract
Voice Disorders – Group of problems involving abnormal pitch, loudness, or quality of the sound produced by the larynx (voice box)