Cognitive Model of OCD
Salkovskis (1985) · Obsessive-compulsive disorder
Written by Tarun Vermani, Trainee Clinical Psychologist Last reviewed
Salkovskis's cognitive model of OCD (1985) locates the problem not in intrusive thoughts, which are common, but in the meaning attached to them — typically inflated responsibility for preventing harm — which drives distress and compulsions.
Cognitive Model of OCD
Salkovskis (1985)
Intrusive Thought / Image
A normal, unwanted intrusive thought, image, urge or doubt — e.g. 'what if I left the door unlocked?', a harm-related or taboo image. Such intrusions are common in the general population.
Appraisal / Meaning
The intrusion is appraised as personally significant — typically inflated responsibility for harm ('having this thought means I must act to prevent it', 'thinking it makes it more likely', 'not preventing harm is as bad as causing it').
Distress / Anxiety
The appraisal produces distress — anxiety, guilt and a strong sense of responsibility — which is uncomfortable and demands action.
Compulsion / Neutralising
Compulsions and neutralising acts aimed at reducing the distress or preventing the feared harm — checking, washing, repeating, mental rituals, reassurance-seeking, thought suppression and avoidance.
Temporary Relief
Temporary relief, or a sense that it 'feels right'. This negatively reinforces the compulsion, strengthens the responsibility appraisal, keeps the intrusion salient, and prevents the person learning that the feared outcome would not have happened.
The published model, shown for reference. Switch to “Blank” to see the empty template you complete with a client.
Understanding the model
Nearly everyone has odd, unwanted thoughts pop into their mind — disturbing images or doubts that seem to come from nowhere. This model shows how, in OCD, the problem isn't the thoughts themselves but the meaning they're given.
An intrusive thought, image or urge appears ('what if I left the cooker on and the house burns down?'). For most people it's just mental noise. But if it's taken to mean something important — that you're responsible for preventing harm, or that thinking it makes it more likely — it becomes very distressing.
That distress creates a strong urge to put things right: to check, wash, repeat, seek reassurance, or try to cancel out the thought. Doing so brings relief for a while.
But the relief teaches the brain that there really was danger and that the ritual is what kept you safe — so the next intrusion feels just as urgent. Checking and neutralising also keep the thought in mind and stop you finding out that nothing bad would have happened anyway. So the cycle repeats and tightens.
Questions therapists ask about this model.
Frequently asked questions
What maintains OCD in this model?
An unwanted thought, image or doubt arrives and is taken to matter: that having it makes the person responsible for preventing harm, or makes the harm more likely. That appraisal brings anxiety and guilt, and with them an urge to put things right by checking, washing, repeating, neutralising or asking for reassurance. The relief that follows teaches that the danger was real and was averted, so the next intrusion arrives just as urgently.
How does it differ from the BDD model?
Both describe checking, comparing and reassurance-seeking, and NICE CG31 covers the two presentations together. The difference is what starts the cycle. Here it is an intrusive thought and the responsibility read into it. In Veale's body dysmorphic disorder model (2004) it is a distorted, observer-perspective image of a particular feature and the meaning appearance carries for the self.
Does having intrusive thoughts mean someone has OCD?
No, and that is the model's starting point. Unwanted thoughts, images and doubts are common in the general population; what the model says sets OCD apart is how they are appraised, chiefly as a sign of responsibility for preventing harm. Rachman (1997) set out a closely related cognitive theory in which obsessions arise when the significance of an intrusive thought is catastrophically misinterpreted, and the two accounts are often read together.
Worksheets and reading for this model
Using this model in session — for therapists
How to introduce the model, guided-discovery questions, treatment targets and a behavioural experiment are available to signed-in therapists.
References
- Salkovskis, P. M. (1985). Obsessional-compulsive problems: A cognitive-behavioural analysis. Behaviour Research and Therapy, 23(5), 571–583.
- Salkovskis, P. M. (1999). Understanding and treating obsessive-compulsive disorder. Behaviour Research and Therapy, 37(Suppl. 1), S29–S52.
- Rachman, S. (1997). A cognitive theory of obsessions. Behaviour Research and Therapy, 35(9), 793–802.
- Salkovskis, P. M., Forrester, E., & Richards, C. (1998). Cognitive-behavioural approach to understanding obsessional thinking. British Journal of Psychiatry, 173(S35), 53–63.
This diagram is a reconstruction of the published model for clinical and educational use, grounded in the sources above.
Cite this page (APA 7)
Vermani, T. (2026). Cognitive Model of OCD. Formulate. https://formulatetools.co.uk/tools/formulation/ocd-cognitive-model
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