Forty-nine healthy, experimentally naive rats of the Sprague-Dawley strain were trained in a shuttle-avoidance apparatus to a pressurized air US with either an 11 sec. CS-I1S interval (group I, N = 28) or an 8 sec. CS-US interval (group II, N = 21) and a 211 min. intertrial interval. CS was a 65 decibel
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