Simulation of speech production using a "neurologically impaired" model reveals patterns similar to stuttering: 1) High frequency of stutters on initial sounds; 2) enhancement of fluency by exposure to white noise; 3) enhancement of fluency by reducing the rate of speech. The results support the notion that stuttering may be in part due to weakening of the pathways involved in feedforward control of well practiced speech sounds and the consequent dominance of auditory feedback control.