Abstract
Two studies are reported dealing with avoidance conditioning in rats. In the first study the stability of the shuttle response was investigated in 4 Ss running 2 hrs. a day over an 18 day period. Stable long term avoidance responding was obtained. Except for extinction, no decrement in avoidance responding developed at anytime. In the second study, fixed ratio reinforcement of the avoidance response was attempted in 10 Ss. Eight Ss acquired the continuously reinforced avoidance response; 2 Ss reached a 2:1 ratio criterion; 4 Ss acquired a 4:1 ratio, and 2 Ss went through a 7:1 and 10:1 ratio. One of the latter Ss attained a fixed ratio of 21:1.
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