Effect of threat of shock for being disfluent of fluency of normal speakers.

Each of 20 adult nonstutterers read a 330-word passage six times with a one minute pause between readings. Between the third and fourth reading or the fifth and sixth reading (determined by a table of random numbers) Ss were informed that at the conclusion of the next reading an electric shock would be administered for each instance of disfluency detected by E during that reading. Ss did not become less fluent as a consequence of the experimental condition. Their mean disfluency frequency during the threat-of-shock reading was lower than during the preceding one. Thus, threat of shock for being disfluent may be a condition which differentiates stutterers from nonstutterers since stutterers have been reported to become less fluent under this condition.