This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. This study will examine neurocognitive performance and regional brain metabolism, as measured by [18-F]-fluorodeoxyglucose positron emission tomography (FDG-PET), of a sample of adults diagnosed with obsessive-compulsive disorder (OCD), immediately before and after four weeks of treatment with intensive cognitive-behavioral therapy (CBT), with or without medication. The specific objectives of this study are: 1. To identify the brain systems that mediate response to treatment with CBT in OCD. 2. To determine whether the changes in brain activity associated with response to intensive CBT are the same or different as those produced by response to medication treatment of OCD (subjects in a parallel study are receiving 12 weeks of medication treatment for OCD - IRB # 92 11 638 21B). 3. To determine whether the neurocognitive abnormalities associated with OCD improve or change after intensive CBT, with or without medication. 4. To determine whether changes in regional brain activity are related to changes in neurocognitive function and OCD symptoms that occur with treatment.
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