This research study will examine how an iPad-based cognitive training game, combined with cognitive behavioral therapy (CBT), helps children with excessive worries (e.g. need to know, fear of germs, getting sick, or something bad happening) and related repetitive behaviors (e.g. tapping, checking, handwashing, counting, reassurance-seeking).

We are also trying to learn how the brain works in children with OCD before and after completing the training.

Your child may be eligible for this study if they meet the following criteria.

Inclusion Criteria:

• 8-12 years old
• Struggle with excessive worries and related repetitive behaviors (OCD)
• No developmental disorder, PTSD, substance/alcohol abuse, psychotic disorder, bipolar disorder, eating disorder, or neurological problems
• No autism diagnosis

Participation in the study involves the following steps:

• Phone interview: 30 minute phone conversation about your child’s medical and psychiatric history
• Diagnostic evaluation with one of our clinicians (virtual)
• 4 weeks of a cognitive training intervention on an iPad at home. We will loan an iPad for your child to use. Participants will be randomly assigned to receive one of two versions of the game.
• 3 in-person visits that include puzzles, games, and 2 MRI scans (if your child is able). Visits will take place at the Columbia University Zuckerman Institute in Upper Manhattan.
• 12 weeks of no-cost online therapy (CBT) with a clinician

Participants can receive up to $425 if they complete the entire study.

There is no cost for your child to participate in our research study or to receive CBT treatment afterwards.