One likely reason for the blocking effect is that
a. the subject habituates to CS1.
b. CS2 predicts the US, and the subject is not surprised by the arrival of the US in later trials.
c. CS1 predicts the US, and the subject is not surprised by the arrival of the US in later trials.
d. CS1 does not predict the US and the animal is startled by the arrival of the US in later trials.
Ans: c
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