the automatic/natural response to a stimulus (beforeconditioning)-Conditioned Stimulus (CS)- The stimulus that is paired with theUS (has to come before US)Initially it does not elicit a response (NS)Following conditioning, it elicits a response (CS)-Conditioned Response (CR)- the response to the CSUsually the same or very similar to the URMajor Phenomena-Acquisition: The initial stage of learning when aneutral stimulusis linked to anunconditioned stimulusso that the neutralstimulus begins triggering theconditioned response-Extinction: The diminished (weakened) responding that occurswhen theconditioned stimulusno longer signals an upcomingunconditioned stimulus.Repeated presentation of the CSwithout the US causes the CS to no longer elicit the CR.-Spontaneous Recovery: thereappearanceof a weakenedconditioned responseafter a pause.-Generalization: the tendency once a response has beenconditions, for stimuli similar to the CS to elicit similar responsesCR-Discrimination: The learned ability todiscriminatebetween aconditioned stimulus and stimuli that do not signal anunconditioned stimulus2