In recent psychological research, various trauma and stressor-related disorders have been studied to better understand their onset and progression. One area of focus is post-traumatic stress disorder (PTSD), which can occur after exposure to a traumatic event. PTSD is characterized by intrusive memories, avoidance behaviors, negative changes in mood and cognition, and heightened arousal.
Which of the following best describes a primary characteristic of PTSD that differentiates it from other anxiety disorders?