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This is possibly because botox causes the facial muscles to relax; and although this collapse lessens the uncontrollable twitching of the muscles, the newly relaxed status deprives the player of the lip flexibility needed to play a brass instrument. For most brass players, diagnosis with focal dystonia signals the end of their careers. [1]
Spasmodic dysphonia, also known as laryngeal dystonia, is a disorder in which the muscles that generate a person's voice go into periods of spasm. [1] [2] This results in breaks or interruptions in the voice, often every few sentences, which can make a person difficult to understand. [1]
The condition should be distinguished from the more common, and milder, involuntary quivering of an eyelid, known as myokymia or fasciculation. Blepharospasm is one form of a group of movement disorders called dystonia. [4] It may be a primary or secondary disorder.
The vagus nerves seems to play a role in the mother condition through a neurovegetative hyperactivity or dysautonomia. It innerves the inferior pharyngeal constrictor muscle where the cricopharyngeal spasms occur. Throat spasms can also appear after an accident, a disease, may be caused or worsened by GERD. There may be hereditary factors.
Motor tics are movement-based tics affecting discrete muscle groups. [4]Phonic tics are involuntary sounds produced by moving air through the nose, mouth, or throat. They may be alternately referred to as verbal tics or vocal tics, but most diagnosticians prefer the term phonic tics to reflect the notion that the vocal cords are not involved in all tics that produce sound.
Virtual reality sickness may have undesirable consequences beyond the sickness itself. For example, Crowley (1987) argued that flight simulator sickness could discourage pilots from using flight simulators, reduce the efficiency of training through distraction and the encouragement of adaptive behaviors that are unfavorable for performance, compromise ground safety or flight safety when sick ...
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A fasciculation, or muscle twitch, is a spontaneous, involuntary muscle contraction and relaxation, involving fine muscle fibers. [1] They are common, with as many as 70% of people experiencing them. [1]