PTSD is characterized by the re-experiencing of the traumatic event through intrusive and upsetting memories, nightmares, flashbacks, and strong emotional and physiological reactions triggered by reminders of the trauma. Most individuals with PTSD try to ward off the intrusive symptoms and avoid the trauma-reminders, even when those reminders are not inherently dangerous. To address the traumatic memories and triggers that are reminders of the trauma, the core components of exposure programs for the disorder are: • Imaginal exposure, revisiting the traumatic memory, repeated recounting it aloud, and processing the revisiting experience •
In vivo exposure, the repeated confrontation with situations and objects that cause distress but are not inherently dangerous The goal of this treatment is to promote processing of the trauma memory and to reduce distress and avoidance evoked by the trauma reminders. Additionally, individuals with emotional numbing and depression are encouraged to engage in enjoyable activities, even if these activities do not cause fear or anxiety but have dropped out the person's life due to loss of interest. The imaginal exposure typically occurs during the therapy session and consists of retelling the trauma to the therapist. For the
in vivo exposure, the clinician works with the client to establish a
fear and avoidance hierarchy and typically assigns exposures to these list items as
homework progressively. The therapist may also record the session and ask the patient to continue to complete in vivo exercises on their own time with the help of the recording. Randomized control trials reflect that only 10–38% of PTSD patients who take part in PE therapy terminate treatment before their program is complete (generally after at least eight sessions). ==Studies==