Peak Shift Is Said to Occur When Two

Multiple Choice

Peak shift is said to occur when two

A) stimuli are so similar that subjects have difficulty distinguishing between them, and thus the peak of the responses shifts so that they respond similarly to both.
B) discriminative stimuli are very similar and produce maximal responding to a stimulus near the S^D and away from the S^Δ.
C) similar stimuli are reinforced and produce a broader peak of maximal responding to more stimuli than would have occurred if only one stimulus had been reinforced.
D) discriminative stimuli are dissimilar and produce maximal responding to a stimulus midway between the S^D and the S^Δ.