Interstimulus interval can be defined as the time interval between the end of one stimulus presentation and the onset of another stimulus presentation.
The concept of interstimulus interval is frequently encountered within processes of non-associative learning, specifically habituation and sensitization Petrinovich (1984).
Experimental Research on Interstimulus Interval
Interstimulus interval experiments were extensive under the work of Davis (1970) on habituation of the acoustic-startle response in the rat. Generally, through Davis’s series of experimental studies it was demonstrated that the length of interstimulus interval, as well as variability (regularity), determines habituation in animals. The author compared the responsiveness of two groups of rats to a 50-ms, 120-db tone of 4000 Hz during pretest, training, and posttest periods. During both the pretest and the posttest periods, both groups of subjects received 300 tone exposures at intervals of 2, 4,...