Answer:
Both Pigeon A and B
Step-by-step explanation:
Peak shift is a term that describes the conditions in which the peak of the generalization gradient moves away from the position of S+ in the direction away from the S-. This implies that, peak shift can be determined if the S+ and S - tigger the existing factors during different training in a graded manner.
Thus, if both S+ and - has mutual characteristics, then a major part of those characteristics will be triggered by both stimuli, thus, the stimulating experience of S+ will override or revoke the experience or training of S-.
Hence, since both pigeon A and B, had the S+ 800Hz tone training initially, with elemental theories, it is determined that, both will produce most peak shift phenomenon.
Note:
S+ is a stimulus showing availability of reinforcement
S- is a stimulus showing lack of reinforcement.