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Test the belief that thinking something makes it more likely to happen (likelihood TAF) or that thinking something is morally equivalent to doing it (moral TAF).
Thought-action fusion is the belief that your thoughts have power — that thinking about something bad makes it happen, or that thinking something bad is as wrong as doing it. These experiments help you test whether thoughts actually influence events or define your character.
Use when thought-action fusion (TAF) has been identified as a maintaining factor — the belief that thinking about an action is morally equivalent to performing it (moral TAF) or increases the likelihood of it occurring (likelihood TAF).
Socialise the client to TAF using examples outside their OCD theme first (e.g., 'Does thinking about winning the lottery increase the chance of it happening?'). Present the experiment as a way to test their specific TAF beliefs directly.
For moral TAF, design experiments testing whether having a thought changes the client's moral character in observable ways. For likelihood TAF, use probability-based experiments with verifiable outcomes. Ensure experiments are collaboratively designed and the client predicts the outcome in advance.
Avoid with clients who have active suicidal ideation involving TAF beliefs about self-harm, as the experiment could be misinterpreted. Use clinical judgement about the timing — the client needs sufficient trust and cognitive flexibility to engage meaningfully.
The power of the experiment lies in the prediction-versus-outcome discrepancy. Ensure the client makes a clear, specific prediction before conducting the experiment. Process the results thoroughly, attending to any dismissals or reinterpretations that preserve the original belief.
Suitable for clients working with ocd, thought-action fusion, taf, cbt, behavioural experiment, intrusions. This tool can be used as a standalone worksheet or as part of a structured homework plan.
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