Behaviourism · 1989
One-Session Treatment - OST (Specific phobias)
The phobia changes when the person confronts what they fear in vivo until their predictions of danger lose their authority.
Lars-Göran Öst's One-Session Treatment (OST) is an intensive behavioural protocol for specific phobias that concentrates the active ingredients of in vivo exposure into a single extended session, usually of up to three hours: a brief cognitive-behavioural analysis, formulation of the maintenance by avoidance, participant modelling, graded but continuous exposure, prevention of escape and safety behaviours, challenging of catastrophic predictions, reinforcement of coping and planning of subsequent self-exposure. The model was designed for circumscribed phobias in which the feared stimulus can be clearly delimited and approached under controlled conditions, such as phobias of animals, heights, flying, claustrophobia, blood-injection-injury, the dentist or other concrete stimuli. Its clinical logic is strictly experiential and behavioural: the patient learns, in the presence of the stimulus, that the anticipated catastrophe does not occur, that they can remain in the situation without escaping and that anxiety can be reduced or become tolerable when avoidance no longer governs behaviour. OST does not simply expose the patient for a long time; it organises the exposure as a series of behavioural experiments directed by the therapist, each designed to test a specific prediction, block avoidance and generate new corrective information. The intervention derives from the tradition of behaviour therapy and in vivo exposure, incorporates participant modelling from social learning theory and anticipates current formulations based on expectancy violation and inhibitory learning, while maintaining an active, directive, collaborative clinical style focused on the rapid generalisation of coping to everyday life.
Theory of change
A person changes when they remain in direct contact with the phobic stimulus, without escape or safety behaviours, until their predictions of danger are disconfirmed and their coping self-efficacy increases.
Core ideas
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Intensive exposure can produce rapid change when the phobia is well delimited
OST shows that a circumscribed specific phobia can be modified rapidly if the session concentrates the active ingredients of learning: direct contact with the stimulus, sufficient duration, grading, escape prevention, modelling and review of predictions. Brevity does not imply superficiality; it requires high technical density and appropriate selection of the case. (Öst, 1989; Öst, 1997).
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Avoidance maintains the phobia because it prevents corrective information
The functional core of the problem is that the patient avoids, escapes or protects themselves precisely when they would need to remain in order to find out what happens. The immediate relief reinforces the avoidance and leaves the expectation of danger intact. OST breaks this circuit by creating a prolonged, controlled and accompanied encounter in which the person can obtain the information that avoidance had blocked. (Öst, 1989; Zlomke & Davis, 2008).
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Exposure works better when formulated as a behavioural experiment
In OST, each step of exposure tests a prediction and is not confined to accumulating time in front of the stimulus. This experimental logic increases clinical precision: the therapist knows what is to be tested, the patient knows why they are facing it, and the outcome becomes experiential evidence against the anticipated catastrophe. (Öst, 1997; Zlomke & Davis, 2008).
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Participant modelling reduces the distance between observation and action
The therapist can initiate the approach by showing how to interact with the stimulus safely, but the aim is for the patient to move quickly from observing to acting. Modelling is a bridge towards coping behaviour, not a permanent guarantee or a substitute for the patient's own exposure. (Öst, 1989; Bandura, 1977).
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Safety behaviours impoverish the learning
An exposure may appear complete and still be clinically weak if the patient looks out of the corner of the eye, becomes distracted, uses the therapist as a barrier, seeks reassurance or keeps a protective distance. OST requires these manoeuvres to be detected and withdrawn, because they allow the absence of catastrophe to be attributed to the protection used rather than to real safety or to the patient's own capacity to cope. (Öst, 1997; Davis, Ollendick & Öst, 2012).
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Change does not depend only on habituating, but on disconfirming predictions
The reduction of anxiety during the session is useful, but the most relevant learning appears when the patient establishes that the feared consequence does not occur, occurs in a less dangerous form or can be faced. This reading brings OST closer to contemporary models of exposure centred on expectancy violation and inhibitory learning. (Öst, 1997; Craske et al., 2014).
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The therapist's directiveness is a technical condition, not an imposition
OST requires an active therapist who guides, models, adjusts intensity, blocks escape and keeps the focus on learning. That directiveness must be supported by the alliance and a shared rationale; without agreement on tasks it can be experienced as pressure, but with collaboration it becomes an effective scaffolding for working through intense fear. (Öst, 1989; Öst, 2012).
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Self-efficacy is built by actions performed in the presence of the stimulus
The patient does not gain confidence because they are told they can, but because they see themselves approaching, touching, entering, remaining or repeating behaviours they previously avoided. The experience of agency must be pointed out and consolidated, so that the change is attributed to the patient's own action and not to luck, to the therapist or to exceptional circumstances. (Öst, 1989; Öst, 2012).
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Generalisation must begin within the session itself
If the exposure is confined to a single tamed form of the stimulus, the learning may remain narrow. OST favours variations in distance, duration, movement, context and degree of independence so that the patient learns a broader rule: they can face different versions of the stimulus and not only one carefully controlled therapeutic situation. (Öst, 1997; Craske et al., 2014).
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The single session is the beginning of independent practice
OST concentrates the initial change, but does not claim that the session replaces all future exposure. The closing must translate what has been learned into concrete self-exposures so that the patient consolidates their coping without depending on the therapist and responds to possible resurgences of fear with practice rather than renewed avoidance. (Öst, 1997; Öst, 2012).
Influences
- Classical conditioning
- Operant conditioning
- Behaviour therapy
- In vivo exposure
- Social learning theory (Bandura)
- Participant modelling
- Cognitive behavioural therapy for specific phobias
- Inhibitory learning
Key references
- Bandura, A. (1977). Social Learning Theory. Prentice Hall.
- Craske, M. G., Treanor, M., Conway, C. C., Zbozinek, T., & Vervliet, B. (2014). Maximizing exposure therapy: An inhibitory learning approach. Behaviour Research and Therapy, 58, 10–23.
- Davis, T. E., Ollendick, T. H., & Öst, L.-G. (Eds.). (2012). Intensive One-Session Treatment of Specific Phobias. Springer.
- Ollendick, T. H., Öst, L.-G., Reuterskiöld, L., Costa, N., Cederlund, R., Sirbu, C., Davis, T. E., & Jarrett, M. A. (2009). One-session treatment of specific phobias in youth: A randomized clinical trial in the United States and Sweden. Journal of Consulting and Clinical Psychology, 77(3), 504–516.
- Öst, L.-G. (1989). One-session treatment for specific phobias. Behaviour Research and Therapy, 27(1), 1–7.
- Öst, L.-G. (1997). Rapid treatment of specific phobias. In G. C. L. Davey (Ed.), Phobias: A handbook of theory, research, and treatment (pp. 227–247). Wiley.
- Öst, L.-G. (2012). One-session treatment: Principles and procedures with adults. In T. E. Davis, T. H. Ollendick, & L.-G. Öst (Eds.), Intensive One-Session Treatment of Specific Phobias. Springer.
- Öst, L.-G., & Sterner, U. (1987). Applied tension: A specific behavioral method for treatment of blood phobia. Behaviour Research and Therapy, 25(1), 25–29.
- Öst, L.-G., Fellenius, J., & Sterner, U. (1991). Applied tension, exposure in vivo, and tension-only in the treatment of blood phobia. Behaviour Research and Therapy, 29(6), 561–574.
- Öst, L.-G., Svensson, L., Hellström, K., & Lindwall, R. (2001). One-session treatment of specific phobias in youths: A randomized clinical trial. Journal of Consulting and Clinical Psychology, 69(5), 814–824.
- Zlomke, K., & Davis, T. E. (2008). One-session treatment of specific phobias: A detailed description and review of treatment efficacy. Behavior Therapy, 39(3), 207–223.