6.	associations between a stimulus and an outcome.
UCS: Unconditioned Stimulus, the stimulus that the subject does not need to be conditioned to have an adverse reaction to.

UCR: Unconditioned Response, the response the subject has to the UCS.

CS: Conditioned Stimulus, the stimulus that the subject acquires an adverse reaction to through conditioning, and before conditioning does not create an adverse response in the subject.

CR: Conditioned Response, the behavior that the subject exhibits in response to the CS.

Extinction, The deletion of an association between CS and CR. Occurs after depriving the subject of the UCS after presenting the CS repeatedly.

Stimulus Discrimination, the phenomenon where the subject exhibits varying amounts of CR when presented with a stimulus that is similar to, but not exactly like, the CS.

Stimulus Generalization, the phenomenon where the subject exhibits CR when presented with a stimulus that has similar traits to the CS.

Spontaneous Recovery, the spontaneous reassociation of  CS and CR after extinction has occurred.