CBT drops Y-BOCS score from 25 to ~11 by week 4
Exposure-based CBT reduced OCD symptom severity scores from approximately 25 down to about 11 within four weeks — a dramatic clinical improvement.
Snapshot · Huberman Lab
Essentials: The Science & Treatment of Obsessive Compulsive Disorder (OCD)
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Jul 9, 2026
Where this was said
CBT vs Placebo vs SSRIs
At 25:30 · chapter starts 25:18
The episode's most clinically significant moment arrives in this chapter. Huberman presents the findings of Dr. Blair Simpson's landmark comparison study pitting exposure-based CBT against SSRIs and placebo. Placebo produced no meaningful reduction in OCD symptoms. SSRIs produced a significant but modest improvement. CBT, however, was transformative: Y-BOCS scores dropped from approximately 25 all the way down to about 11 within just four weeks — a nearly 60% reduction in symptom severity. When SSRIs and CBT were combined, the results were almost identical to CBT alone. There was no synergistic benefit from the combination. This finding has direct clinical implications: for patients already on SSRIs, adding CBT is the priority; for patients considering treatment, CBT alone may be sufficient and may be the more powerful starting point.
CBT Crushes SSRIs: The Head-to-Head Data
When CBT, SSRIs, and placebo were compared head-to-head, CBT halved OCD symptom severity scores within four weeks. SSRIs helped — but left patients substantially more symptomatic than CBT alone. Combining them added nothing extra.
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