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A brief multiple discrimination procedure using a cardiac response.

Sixteen adult human subjects participated in an experiment examining whether a “no-delay” cardiac orienting paradigm could effectively test discrimination of four different stimulus changes in a single brief session. Subjects heard a 4.5-min train of pulsing tones which changed in frequency, intensity, pulse duration, or location of the sound source at irregular intervals. Cardiac deceleration to changes in frequency, duration, and location were significant at p<.05. It is concluded that changes in continuing stimulation can be effective discrimination probes, and that a number of different discrimination probes can be tested in one session using this procedure. The significance of a failure to elicit a response to change in tone intensity is discussed.