Neurofeedback of Amygdala Activity for Post-traumatic Stress Disorder

In pursuit of the overarching goals of this study, the investigators aim to: * determine if an experimental feedback intervention increases control over the region of interest (the amygdala) more than a control feedback intervention in which participants receive feedback that is unassociated with their PTSD symptoms. * determine if an experimental feedback intervention results in clinical improvements in PTSD symptoms relative to a control feedback intervention, and examine whether these improvements correlate with improved control over the amygdala. * determine if an experimental feedback intervention results in changes in resting state connectivity to the amygdala, and whether these changes correlate with symptom improvement and an improved ability to regulate the amygdala.