the tone was presented in compound with the light (Stage 1) and also in compound with the bell (Stage 2). What was the critical difference between the two compound CSs—CSMT&CSML and CSMT&CSB?
a. CSMT&CSB was never paired with shock but CSMT&CSML always was.
b. The bell overshadowed the tone but the light did not.
c. CSMT&CSB was always paired with shock but CSMT&CSML never was.
d. CSMT&CSB was presented only once.
d. CSMT&CSB was presented only once.
Answer feedback: There was no evidence that the bell overshadowed the tone. Neither compound stimulus was ever paired with shock. CSMT&CSML was presented on 10 trials during Stage 1 in order for the tone to become an inhibitory stimulus. Then it was paired with the bell for the first (and only) time in Stage 2 to further demonstrate its inhibitory effect.
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