What is Inference-Based CBT (I-CBT)?

Inference-Based CBT is an evidence-based treatment for OCD developed by Dr. Kieron O'Connor and Frederick Aardema, researchers who spent decades studying the specific reasoning processes that drive obsessional thinking. Rather than focusing primarily on exposure to feared situations, I-CBT targets the source of OCD at a different level — the distorted reasoning that makes obsessional doubt feel compelling and real in the first place.

The core insight of I-CBT is that OCD isn't really about the content of obsessive thoughts. It's about a particular kind of doubt — obsessional doubt — that operates differently from the ordinary uncertainty everyone experiences in daily life. I-CBT helps clients understand and untangle that distinction, which changes their relationship to OCD thoughts without requiring them to confront feared situations directly.

What does I-CBT treatment focus on?

I-CBT addresses several interconnected concepts that maintain OCD. Treatment explores inferential confusion, the process by which the mind treats an imagined possibility as though it were a real and present danger. It also addresses the feared possible self, the OCD-driven narrative about who you might secretly be or become, which often underlies the most distressing obsessional themes. And it examines the difference between everyday doubt, the normal uncertainty that resolves through direct experience, and obsessional doubt, which persists regardless of evidence because it was never really based on evidence to begin with.

Working through these concepts collaboratively, clients typically find that OCD thoughts lose their grip not because they've been exposed to them repeatedly, but because the reasoning that made them feel credible has been examined and dismantled.

Who is I-CBT a good fit for?

I-CBT tends to be a particularly good fit for people who have tried ERP and found it ineffective or only partially helpful, people who feel that exposure-based treatment isn't right for them for any reason, people whose OCD is heavily driven by introspection, imagination, or narrative reasoning rather than external triggers, and people who want to understand and address the cognitive roots of their OCD rather than working primarily through behavioral exercises. It is also used with adolescents and young adults.