In Exercise 13 (higher-order conditioning), there was a tendency for the CS response strength curves representing CS1 and CS2 to curve downward once they reached their peaks. This tendency was the result of
a. overshadowing.
b. habituation.
c. sensory preconditioning.
d. extinction.
d. extinction.
Answer feedback: Once the tone (CS2) was no longer followed by the US, its response strength declined. Once the light (CS1) was no longer followed by t CS2, its response strength declined similarly.
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