Ryan is an alcoholic who has been unable to control his drinking. He has lost his job, and his wife divorced him. Finally, he entered therapy in an attempt to control his desire to drink. The behavioral therapist gave Ryan a drug called Antabuse and told him that it would make him nauseous if he drank alcohol. Ryan has only had two drinks since he entered therapy, and both times he became sick. Now he finds that the thought of drinking no longer has the pleasant associations that it once did. In this case, the therapist used:
a token economy to help Ryan overcome his desire for alcohol
aversion therapy to help Ryan overcome his desire for alcohol
systematic desensitization to help Ryan overcome his desire for alcohol
negative reinforcement to help Ryan overcome his desire for alcohol