Overlapping Neural Circuits in Pediatric OCD

Patient Inclusion Criteria: * Participants must be 5-17 at the time of consent * Diagnostic and Statistical Manual of Mental Disorders (DSM-IV) Diagnosis of OCD as the principal problem * Not on psychotropic medication and not receiving current psychotherapy for OCD * Written informed assent by the participants (8 and older) and consent by the parent * Participants and a parent/guardian must be able to read and understand English Patient Exclusion Criteria: * DSM-IV current diagnosis of major depressive disorder, attention-deficit hyperactivity disorder, Tourette's/Tic Disorder, or substance/alcohol abuse * DSM-IV lifetime diagnosis of psychotic disorder, bipolar disorder, eating disorder, pervasive developmental disorder, or substance/alcohol abuse * Active suicidal ideation * Females who are pregnant or nursing * Major medical or neurological problems * Presence of metallic device or dental braces * IQ\<80 * A current or past diagnosis of pediatric autoimmune neuropsychiatric disorders associated with streptococcus (PANDAS) * Individuals who are currently receiving CBT, other forms of psychotherapy, or psychotropic medications * Individuals who have received a full course of CBT in the past * A positive pregnancy test * Positive urine screen for illicit drugs * Inability of participant or parent/guardian to read or understand English Healthy Control Inclusion Criteria: * Participants must be 5-17 at the time of consent * Written informed assent by the participants (8 and older) and consent by the parent * Participants and a parent/guardian must be able to read and understand English Healthy Control Exclusion Criteria: * Any current or lifetime psychiatric diagnosis * Active suicidal ideation * Females who are pregnant or nursing * Major medical or neurological problems * Presence of metallic device or dental braces * IQ\<80 * A current or past diagnosis of pediatric autoimmune neuropsychiatric disorders associated with streptococcus (PANDAS) * A positive pregnancy test * Positive urine screen for illicit drugs * Inability of participant or parent/guardian to read or understand English