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Frederick Aardema

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March 2026


Frederick Aardema, PhD, is a clinical psychologist, researcher, and professor at the University of Montreal. He is co-creator of Inference-Based Cognitive Behavioral Therapy (ICBT) and author of several books on OCD, including the acclaimed Resolving OCD series, which has given hope and clarity to readers worldwide.

Average rating: 4.48 · 113 ratings · 19 reviews · 5 distinct worksSimilar authors
The Doubt Illusion: A Compa...

4.44 avg rating — 62 ratings3 editions
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Resolving OCD: Understandin...

4.56 avg rating — 32 ratings2 editions
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Resolving OCD: Advanced Str...

4.47 avg rating — 19 ratings2 editions
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Beyond Reasonable Doubt

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0.00 avg rating — 0 ratings — published 2005
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“OCD plants distrust — Maybe your memory, your senses, your self-knowledge can’t be trusted.”
Frederick Aardema, The Doubt Illusion: A Compact Guide to Overcome OCD with Inference-Based Cognitive Behavioral Therapy

“This is why so many people say: It feels like my OCD keeps changing. In reality, it isn’t multiplying. It’s orbiting. The spoke may change, but the hub doesn’t move. One person cycles through contamination, checking, harm, and relationship themes — yet underneath, the feared self is the same: You are careless and dangerous. Another rotates through morality, confession, and memory doubts — yet the feared self is steady: You are corrupt. This is why the fears feel so personal. They’re not random. They’re tailored — custom-made to fit your deepest concerns. OCD does not waste its costumes on identities you don’t care about. It always performs under your brightest spotlight.”
Frederick Aardema, The Doubt Illusion: A Compact Guide to Overcome OCD with Inference-Based Cognitive Behavioral Therapy

“A thought feels heavy, serious, morally charged — and you mistake the weight for truth. After all, ordinary imagination is light, playful, whimsical. But this feels different. This feels grave. It’s like hearing a voice in a cathedral. The acoustics make it echo, resonate, expand — but the echo is not proof of divine authority. It’s proof of architecture.”
Frederick Aardema, The Doubt Illusion: A Compact Guide to Overcome OCD with Inference-Based Cognitive Behavioral Therapy

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