Abstract
Shuttle runs between white and black sides of a shuttle box by satiated rats previously exposed to one side of the shuttle box during the 22nd hr. of water privation were faster than runs by a control group conditioned in a distinctively different apparatus. Less stable, statistically insignificant differences occurred among groups conditioned during the 2nd hr. of privation. Experimental groups failed to run faster on trials started in the conditioned compartment (escape trials) than on trials terminating in the conditioned compartment (avoidance trials); but comparable groups showed such a difference after shuttle compartments were made discriminable by floor cues as well as by color. The escape-avoidance difference was then largest for groups conditioned during the 2nd hr. of privation.
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