1. Extinction: Extinction is the weakening or disappearance of a conditioned response due to the lack of reinforcement.
2. Spontaneous Recovery: Spontaneous recovery is the reappearance of an extinguished conditioned response after a while has passed since the last extinction trial.
3. Generalization: Generalization is the tendency for a conditioned response to be elicited by stimuli that are similar to, but not identical to, the original conditioned stimulus.
4. Discrimination: Discrimination is the ability to differentiate between stimuli that are similar but not identical.