I am having trouble grasping the concept. When I review the literature different definitions are given. Also, sometimes I do not see the different between a generalization decrement effect and a training specific effect. To clarify my confusion: Let's say an animal A learned to responds to the stimulus A; then when exposed to stimulus B (a similar but different stimulus), this animal responds less. In this case how a researcher would differentiate between a generalization decrement hypothesis v.s a training specific effect?