Role of the intertrial interval in Pavlovian differential conditioning of fear in rats.

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Abstract
In Exp. I, 36 naive female Long-Evans rats were trained to turn a wheel to avoid unsignaled shock, then received Pavlovian differential conditioning with either a .5-, 1-, 2-, or 5-min ITI. Decreased responding to CS-, but not increased responding to CS+, was a function of ITI duration. In Exp. II with 47 female hooded rats, Pavlovian differential inhibitory conditioning, with 2 conditioned inhibitors (CI1 and CI2), each signaling a different shock-free interval, was administered. Decreased responding to CI1, that always signaled at 200-sec period free from shock, was a function of the duration of the shock-free (10-, 110-, 200-, 290-, or 390-sec) interval correlated with CI2. Results suggest possible relationships between the role of the intertrial, or shock-free, interval in Pavlovian inhibitory conditioning and in avoidance training. (20 ref.) (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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