I Train a Rat to Discriminate Between a Circle and an Octagon.Every

Multiple Choice

I train a rat to discriminate between a circle and an octagon.Every time the rat presses the octagon switch,I give it a piece of cheese.Soon the rat chooses the octagon on every trial.Then I give the rat a choice between the original octagon and a significantly larger octagon.The rat then chooses the larger octagon.This is an example of ______.

A) occasion-setting stimuli
B) peak shift
C) conditioned excitation
D) an interoceptive stimulus