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Spasmodic dysphonia (SD), a focal form of dystonia, is a neurological voice disorder that involves involuntary "spasms" of the vocal cords causing interruptions of speech and affecting the voice quali... Details >

National Spasmodic Dysphonia Association  

This online fact sheet provides basic information about the communication disorder spasmodic dysphonia. The document discusses the three known types of this disorder.... Details >

National Institute on Deafness and Other Communication Disorders

This site provides a selection of links to resources available related to this Spasmodic Dysphonia disorder.... Details >

National Spasmodic Dysphonia Association  

Voice is generated by airflow from the lungs as the vocal folds are brought close together. This page presents all the symptoms of this disorder.... Details >

National Spasmodic Dysphonia Association