Brain Function and Cognitive Control Training in Children With Obsessive-Compulsive Symptoms

Inclusion Criteria: * Age 8 to 12 years at the time of consent (i.e., 8.00 - 12.99 years). * Will have definite obsession(s) and/or compulsion(s) * NO current or lifetime history of meeting DSM-5 criterion B for OCD. * Not on psychotropic medication (either treatment-naïve or free of psychotropic medication for at least one month) or on stable medication regime for ADHD (e.g., stimulants). * Capacity to provide written informed assent by the participants and permission by the parent/guardian. Exclusion Criteria: * DSM-5 current major depressive disorder. * DSM-5 current or lifetime diagnosis of OCD, PTSD, substance/alcohol abuse, psychotic disorder, bipolar disorder, eating disorder, pervasive developmental disorder. * Current or lifetime history of a major medical or neurological problem (e.g., unstable hypertension, seizure disorder, major head trauma). * Active suicidal ideation with some intent to act. * Presence of metallic device (ferromagnetic implants or dental braces). * Females who are pregnant or nursing. * Wechsler Abbreviated Scale of Intelligence II Full-scale IQ \<80.