Recall that habituation refers to the decrease of the UR with repeated exposure to the US by itself. The movement-ratio results and the CS-response-strength results from Stage 1 in Exercise 21 suggest that the US pre-exposure effect is not the result of habituation because
a. there were only 10 presentations of the US.
b. although CS response strength remained at zero, the movement ratio was occasionally greater than zero.
c. although the movement ratio remained at zero, the CS response strength rose above zero.
d. the non-zero levels of both measures indicated that background conditioning had taken place.
d. the non-zero levels of both measures indicated that background conditioning had taken place.
Answer feedback: The movement-ratio results and the CS-response-strength results both suggest that a low level of background conditioning developed during Stage 1. This would have been unlikely had the UR habituated.
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