University of Kansas Medical Center, Kansas City, Kansas
Ten normal speakers read a passage, first in Random Condition, then in Contingent Condition. In each condition, subjects read in Baserate (5 minutes), Conditioning (15 minutes), and Extinction (10 minutes). During Conditioning in Random Condition, subjects received a 0.75 sec., 95 dB burst of white noise on a random schedule. During Conditioning in Contingent Condition, subjects heard the word no each time they were disfluent. Disfluency increased under random noise and decreased under contingent no. The results indicate that disfluency that is established or augmented by an aversive stimulus is amenable to suppression by punishment with a different aversive stimulus.