Testing a Causal Model of Cognitive Control Deficits in Posttraumatic Stress Disorder (PTSD)

Inclusion Criteria: * Over 18 years of age * Endorse lifetime exposure to at least one Criterion A traumatic event * Report clinically significant posttraumatic stress disorder (PTSD) symptoms (score of ≥ 33 on the PTSD Checklist for DSM-5 \[PCL-5\]). Exclusion Criteria: * Endorse medical contraindication for neuromodulation (e.g., ferrous metal in head, seizure disorder, brain tumor, stroke, aneurysm, multiple sclerosis, etc.) * Report an unstable medical condition or any current medical condition that precludes safe participation in the trial (e.g., unstable metabolic abnormality, unstable angina, etc.) * Report any history or diagnosis of dementia or other cognitive disorder, which may interfere with engagement * Report any history or diagnosis of Severe Traumatic Brain Injury * Report any history or diagnosis of Schizophrenia, Schizoaffective Disorder, Delusional Disorder or other psychotic illness, which precludes safe participation in the trial * Report a primary obsessive-compulsive disorder (OCD) diagnosis * Report an active substance use disorder (within last 3 months) or any current substance use that precludes safe participation in the trial * Report suicide risk that precludes safe participation in the trial, defined as clinical impression that the participant is at significant risk for suicide (i.e., greater than moderate level of suicide risk, in accordance with the Joiner et al. (1999) suicide risk framework) * Report an inability to stop taking any medication that significantly lowers the seizure threshold (e.g., tricyclic antidepressants, clozapine, etc.) * Report a current, planned, or suspected pregnancy