Behaviorists have described a number of different phenomena associated with classical conditioning. Some of these elements involve the initial establishment of the response, while others describe the disappearance of a response. These elements are important in understanding the classical conditioning process.
Acquisition
Acquisition is the initial stage of learning when a response is first established and gradually strengthened. For example, if you are trying to teach a dog to shake in response to a verbal command, you can say the response has been acquired as soon as the dog shakes in response to only the verbal command. Once the response has been acquired, you can gradually reinforce the shake response to make sure the behavior is well learned.
Extinction
Extinction occurs when the occurrences of a conditioned response decrease or disappear. In classical conditioning, this happens when a conditioned stimulus is no longer paired with an unconditioned stimulus. For example, if the smell of food (the unconditioned stimulus) had been paired with the sound of a whistle (the conditioned stimulus), it would eventually come to evoke the conditioned response of hunger. However, if the unconditioned stimulus (the smell of food) were no longer paired with the conditioned stimulus (the whistle), eventually the conditioned response (hunger) would disappear.
Sponteneous Recovery
Spontaneous Recovery is the reappearance of the conditioned response after a rest period or period of lessened response. If the conditioned stimulus and unconditioned stimulus are no longer associated, extinction will occur very rapidly after a spontaneous recovery.
Stimulus Generalization
Stimulus Generalization is the tendency for the conditioned stimulus to evoke similar responses after the response has been conditioned. For example, if a rat has been conditioned to fear a stuffed white rabbit, it will exhibit fear of objects similar to the conditioned stimulus.
Discrimination
Discrimination is the ability to differentiate between a conditioned stimulus and other stimuli that have not been paired with an unconditioned stimulus. For example, if a bell tone were the conditioned stimulus, discrimination would involve being able to tell the difference between the bell tone and other similar sounds.
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