title: Conditioned suppression with extinction as the signalled stimulus.
abstract: The key pecking of pigeons that was maintained by a 60-sec random-interval schedule of food reinforcement was suppressed during a variable-duration warning stimulus that signalled a 5-min extinction period. The onset of the extinction period immediately followed the termination of the warning signal and was independent of the subject's responses. All subjects eventually showed nearly complete suppression of responding during the warning stimulus.
authors.forename: P W
authors.initials: PW
authors.lastname: Holmes