Inclusion Criteria:  Males and females between the ages of 18 and 80 Current DSM-5 diagnosis of PTSD CAPS-V score greater than or equal to 25 Fluent in English and willing to give informed written consent and participate responsibly in the protocol. Normal or corrected-to-normal vision Mini Mental Status Exam score greater than or equal to 24.  Exclusion Criteria:  History of psychiatric diagnosis of psychotic episode, psychotic disorder, schizophrenia, schizoaffective disorder Current severe depression determined by a a) score greater than 25 on the Hamilton Rating Scale for Depression (HAM-D-17) and evaluation and b)clinical assessment Suicidal ideation or behavior Current or past diagnosis of obsessive compulsive disorder, bipolar disorder, epilepsy, or brain injury as determined by a Structured Clinical Interview for DSM-5 (SCID-5) interview Current or past organic mental disorder, seizure disorder, epilepsy or brain injury as determined by a clinical evaluation Diagnosis of probable Alzheimer's disease, Vascular Dementia, or Parkinson's Disease, as determined by a clinical evaluation and Mini Mental Status Exam (MMSE) Current unstable or untreated medical illness Drug or alcohol misuse- severe alcohol/cannabis disorder or any other substance use disorder except nicotine. Recurrent psychotropic medication change or initiation within the last 3 months Initiation of psychotherapy within the last 3 months Current or past Attention Deficit Hyperactivity Disorder (ADHD) diagnosis Chronic pain that may affect sitting down and still for approximately 30 minutes Current cognitive impairments as a result of a traumatic brain injury, as determined by a clinical evaluation