Within the movement ratio and CS response strength windows in Exercise 3, where should one look for clear evidence of spontaneous recovery?
a. The early trials of Stage 1 and the early trials of Stage 2
b. The early trials of Stage 1 and the early trials of Stage 3
c. The late trials of Stage 1 and the late trials of Stage 2
d. The late trials of Stage 2 and the early trials of Stage 3
d. The late trials of Stage 2 and the early trials of Stage 3
Answer feedback: Spontaneous recovery refers to changes in the CR that occur from the end of one extinction session to the beginning of the next. Specifically, there is an observable increase in the CR as a result of the time-out that occurs between the sessions. Stages 2 and 3 provided this arrangement. Therefore, looking at the CR in terms of the movement ratio or the CS response strength at the end of Stage 2 and at the same measures at the beginning of Stage 3 provides clear evidence of spontaneous recovery.
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