It should be noted that in operant conditioning, extinction do take place when a response is no longer reinforced following a discriminative stimulus.
Operant conditioning can be regarded as a type of associative learning process which involves modifications as well as reinforcement of the strength of a behavior.
Extinction in operant conditioning is when the response is not been modified or reinforced, this is been established by Skinner, who was a physiologist.
Therefore, in operant conditioning, extinction do surface when there is no modification to the response.
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