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Final answer:The stimulus which is removed after a response to strengthen that response is known as a negative reinforcer, a concept in operant conditioning that signals the removal of an unpleasant stimulus to increase the likelihood of a behavior's recurrence.Explanation:Understanding Operant ConditioningAny stimulus that, when removed after a response, strengthens the response is called a negative reinforcer. This is because the stimulus (which is usually seen as unpleasant or undesirable) is taken away or removed after the occurrence of a behavior, thus making the behavior more likely to happen again in the future. It is important to note thatnegativedoes not imply bad in this context, but rather the removal of a stimulus as opposed to the addition which would be indicated by the termpositive.Reinforcement in either form aims to increase a behavior, whereas punishment is designed to decrease a behavior. For example, in horse training, the pressure applied by the reins or legs is removed when the horse performs the desired behavior, thus the removal of pressure acts as a negative reinforcer, increasing the likelihood of the horse's compliance in future....