Vocal Tremors and Stuttering

VOCAL TREMORS AND STUTTERING: AN HYPOTHESIS

Netsell (1990) presented the hypothesis that some vocal tremors are caused by an increased activity of the autonomic nervous system (ANS). In the figure below, ANS activity increases above a threshold that induces an amplitude increase in an inherent neural oscillation (OSC).  In turn, the increased OSC amplitude results in a vocal tremor at the same frequency (~5Hz).  A similar phenomenon may be operating in some people who stutter.

 

REFERENCE

Netsell, R. (1990).  Oscillators run amok. A presentation to the annual meeting of the American Speech-Language-Hearing Association, Seattle, WA