Cortical dysfunction of the supplementary motor area in a spasmodic dysphonia patient

Shigeru Hirano, Hisayoshi Kojima, Yasushi Naito, Ichiro Tateya, Kazuhiko Shoji, Ken Ichi Kaneko, Masato Inoue, Sadahiko Nishizawa, Junji Konishi

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18 Citations (Scopus)


The etiology of spasmodic dysphonia (SD) is still unknown. In the present study, cortical function of a 59-year-old male patient with adductor type SD was examined during phonation with positron emission tomography (PET). Magnetic resonance imaging showed no organic abnormality in the brain. However, PET showed remarkable activities during phonation in the left motor cortex, Broca's area, the cerebellum, and the auditory cortices, whereas the supplementary motor area (SMA) was not activated. The SMA is known to function for motor planning and programming and is usually activated in normal phonation. Several previous reports have shown that the damage of the SMA caused a severe disturbance of voluntary vocalization. In the present case, it was suggested that the functional deficit of the SMA might be related to SD.

Original languageEnglish
Pages (from-to)219-222
Number of pages4
JournalAmerican Journal of Otolaryngology - Head and Neck Medicine and Surgery
Issue number3
Publication statusPublished - 05-2001
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Otorhinolaryngology


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