he introduction of an unpleasant stimulus is to as the withdrawal of an unpleasant stimulus is to . partial reinforcement; continuous reinforcement negative reinforcer; positive reinforcer punishment; reinforcement primary reinforcer; secondary rein

The answer is "reinforcement and punishment"

Explanation:

The introduction of a pleasant stimulus is reinforcement, which is its removal. For one thing, there are several different types of stimuli that drive activity toward a specific goal.

It is thought that when a nice stimulus is supplied, the best effect would be achieved, however when a pleasant load is presented, the intended consequence may no longer be necessary, even when an action has already been taken and may have been taken. This acts as a symbol of retribution.

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