Aversion therapy is a behavioral intervention based on the principle of positive punishment.
In psychological terms, positive punishment refers to adding an unpleasant stimulus immediately after an unwanted behavior to reduce its frequency.
By creating a negative association, clinicians aim to break harmful habits or compulsive patterns.
Historically, this approach involved applying physical discomfort, such as mild electric shocks, to deter problematic actions.
While these methods were common in the mid-20th century, modern practitioners rarely use them.
Today, cognitive behavioral therapy (CBT) focuses on more ethical and sustainable strategies for change.
How it Works
Aversion therapy pairs the stimulus that can cause deviant behavior (such as an alcoholic drink or cigarette) with some unpleasant (aversive) stimulus, such as an electric shock or nausea-inducing drug.
With repeated presentations, the two stimuli become associated, and the person develops an aversion towards the stimuli which initially caused the deviant behavior.
Aversion therapy is based on classical conditioning. According to learning theory, two stimuli become associated when they frequently occur together (pairing).
For example, in addiction, the drug, alcohol, or behavior in the case of gambling becomes associated with pleasure and high arousal.
Aversion therapy uses the same principle but changes the association and replaces the pleasure with an unpleasant state (counterconditioning).
Examples
Alcoholism
Aversion therapy has been used effectively for years in the treatment of alcoholism (Davidson, 1974; Elkins, 1991; Streeton & Whelan, 2001).
Patients are given an aversive drug, which causes vomiting-emetic drug.
They start experiencing nausea; at this point, they are given a drink smelling strongly of alcohol, and they start vomiting almost immediately. The treatment is repeated with a higher dose of the drug.
Another treatment involves the use of disulfiram (e.g., Antabuse). This drug interferes with the metabolism of alcohol.
Normally, alcohol is broken down into acetaldehyde and then into acetic acid (vinegar).
Disulfiram prevents the second stage from occurring, leading to a very high level of acetaldehyde which is the main component of hangovers.
This results in severe throbbing headaches, increased heart rate, palpitations, nausea, and vomiting.
Gambling addiction
For behavioral addiction, such as gambling, aversion therapy involves associating such stimuli and behavior with a very unpleasant unconditioned stimulus, such as an electric shock.
These shocks are painful but do not cause damage.
The gambler creates cue cards with key phrases they associate with their gambling and then similar cards for neutral statements.
As they read through the statements, they administer a two-second electric shock for each gambling-related statement.
The patient set the intensity of the shock themselves, aiming to make the shock painful but distressing.
The client thus learns to associate the undesirable behavior with the electric shock, and a link is formed between the undesirable behavior and the reflex response to an electric shock.
Covert Sensitization
Covert sensitization is a variation where the unpleasant consequence occurs entirely within the client’s imagination.
This is used for behavioral excesses like gambling, overeating, or sexual deviations.
The therapist directs the client to visualize themselves engaging in the target habit.
Simultaneously, the client imagines a repulsive event, such as becoming violently nauseous or facing public ridicule.
This mental “punisher” can eventually translate into real-world behavior change without the need for physical pain.
Critical Evaluation
The decline of aversion therapy is due to both ethical problems and practical limitations. Many practitioners now view these methods as outdated or even inhumane.
Limitations and Risks of Punishment
Modern behavioral therapy prioritizes positive reinforcement, which involves providing rewards to strengthen healthy, adaptive behaviors.
Several factors contribute to the decline of punishment-based models:
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Emotional Side Effects: Aversive stimuli can trigger disabling anxiety, aggression, or a desire to retaliate against the therapist.
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Relationship Erosion: The use of pain or discomfort fosters deep mistrust and may lead to the dehumanization of the client.
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Lack of Generalization: These techniques are often impractical to implement in a client’s natural, day-to-day environment.
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Instructional Deficit: Punishment only teaches a person what not to do. It fails to guide them toward better, healthier alternatives.
Ethical Issues and Compliance
Clinicians have largely abandoned physical aversion methods due to equivocal effectiveness, meaning the results are inconsistent or uncertain.
Furthermore, these techniques often produce severe negative side effects.
Using such methods can lead to the dehumanization of the client, where the individual is treated more like an object than a person.
Other significant risks include:
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Increased aggression in the patient.
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Development of fear or mistrust toward the therapist.
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Extreme difficulty applying these methods in real-world settings.
Ethical Guidelines for Use
Because the research base supporting positive punishment procedures is highly limited and largely restricted to a small number of behavior domains, contemporary ethical guidelines strictly govern their use.
If an aversive procedure is ever to be considered in an applied setting, it must only be used if:
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Functional Assessment: A rigorous analysis must identify the specific variables maintaining the problem behavior.
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Exhaustion of Alternatives: Clinicians must first attempt less restrictive procedures, such as negative punishment (removing a pleasant stimulus) or positive reinforcement.
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Specialized Training: The practitioner must have specific, expert training in aversive protocols.
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Oversight: A review panel must provide supervision. If monitoring shows the treatment is ineffective, it must be discontinued immediately.
Ultimately, because punishment-based models only inform individuals about what not to do rather than guiding them on what they should do, they are viewed as a last resort in modern clinical practice
Generalization and Relapse
A significant hurdle is the lack of generalization, which is the ability of a learned behavior to transfer from the clinic to the real world.
A patient may avoid alcohol in a room where they expect a shock. However, they know that drinks at a local pub will not trigger an electric current.
Consequently, relapse rates are high once the patient leaves the controlled environment of the therapist’s office.
The Holistic Deficit
Aversion therapy is often criticized for being reductionist, meaning it simplifies a complex problem into a basic stimulus-response loop.
It treats the outward behavior but ignores the underlying etiology, or the root cause of the addiction.
If a person drinks to cope with trauma or anxiety, removing the urge to drink through fear does not solve the initial distress.
A more holistic approach targeting biological, cognitive, and social factors is usually necessary for lasting recovery.
Empirical Validation of Aversion Therapy
Research into the effectiveness of these methods provides mixed results. While some early studies showed promise, modern reviews are more skeptical.
Chesser (1976)
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Aim: To investigate the long-term abstinence rates of alcoholics undergoing aversion therapy.
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Procedure: Researchers tracked a group of patients who received aversive conditioning for alcohol addiction over one year.
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Findings: The study found that 50% of the participants remained abstinent for at least twelve months.
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Conclusions: Aversion therapy can be more effective than no treatment at all for certain individuals.
Hajek and Stead (2013)
Aversive conditioning for smoking often involved electric shocks or a technique known as rapid smoking. In rapid smoking, a client takes a puff every few seconds to induce dizziness and nausea.
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Aim: To evaluate the overall quality of evidence supporting aversion therapy for smoking cessation.
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Procedure: The researchers conducted a systematic review of twenty-five separate studies on aversive methods.
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Findings: They discovered that twenty-four of the twenty-five studies contained significant methodological flaws.
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Conclusions: The current evidence is insufficient to prove that these methods promote long-term abstinence.
References
Chesser, E. S. (1976). Behaviour therapy: Recent trends and current practice. The British Journal of Psychiatry, 129 (4), 289-307.
Davidson, W. S. (1974). Studies of aversive conditioning for alcoholics: A critical review of theory and research methodology. Psychological Bulletin, 81 (9), 571.
Elkins, R. L. (1991). An appraisal of chemical aversion (emetic therapy) approaches to alcoholism treatment. Behavior research and therapy, 29 (5), 387-413.
Hajek, P., & Stead, L. F. (2001). Aversive smoking interventions for smoking cessation. Cochrane Database of Systematic Reviews, (3).
Krampe, H., Stawicki, S., Wagner, T., Bartels, C., Aust, C., Rüther, E., … & Ehrenreich, H. (2006). Follow-up of 180 alcoholic patients for up to 7 years: Combined Antabuse treatment of alcoholism (CATA). Psychopharmacology, 187(1), 115-127.
Hajek, P., Stead, L. F., West, R., Jarvis, M., Hartmann‐Boyce, J., & Lancaster, T. (2013). Relapse prevention interventions for smoking cessation. Cochrane database of systematic reviews, (8).
Skinner, B. F. (1953). Science and human behavior. Simon and Schuster.
Streeton, C., & Whelan, G. (2001). Naltrexone, a relapse prevention maintenance treatment of alcohol dependence: a meta-analysis of randomized controlled trials. Alcohol and Alcoholism, 36 (6), 544-552.
