In Experiment 41, once simple tone-on S- discrimination learning was complete, the rate of bar pressing
a. remained at about the same moderate level in the presence and absence of the S-.
b. was highest during the S- and lowest during the S+.
c. was lowest during the S- and highest during the S-.
d. rarely rose above zero.
c. was lowest during the S- and highest during the S-.
Answer feedback: The cumulative record showed bar pressing at a high rate during the S+ (no tone). Few, if any, responses occurred during the S- (2.0 kHz tone).
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