Fear, according to the , is the emotional response to real or perceived imminent threat, whereas is anticipation of future threat (APA, 2013). All anxiety disorders contain some degree of fear or anxiety symptoms (often in combination with avoidant behaviors), although their causes and severity differ. Trauma-related disorders may also, but not necessarily, contain fear and anxiety symptoms, but their primary distinguishing criterion is exposure to a traumatic event. Trauma can occur at any point in life. It might not surprise you to discover that traumatic events are likely to have a greater effect on children than on adults. Early-life traumatic experiences, such as childhood sexual abuse, may influence the physiology of the developing brain. Later in life, there is a chronic hyperarousal of the stress response, making the individual vulnerable to further stress and stress-related disease. For this Assignment, you practice assessing and diagnosing patients with anxiety disorders, PTSD, and OCD. Review the criteria for the disorders within these classifications before you get started, as you will be asked to justify your differential diagnosis with criteria. Complete and submit your Comprehensive Psychiatric Evaluation, including your differential diagnosis and critical-thinking process to formulate primary diagnosis. Incorporate the following into your responses in the template: Select of the following videos to use for your Assignment this week. Then, access the document Case story Reports and review the additional data about the patient in the specific video number you selected.