Abstract Prolonged Exposure Therapy is a frontline intervention for posttraumatic stress
disorder, but the mechanisms underlying its efficacy are not fully understood. Previous
research demonstrates that between-and within-session habituation of fear during exposure
is associated with treatment outcome, but these calculations are historically performed with
summary statistics such as mean subjective units of distress (SUDS). This question could be
better assessed with an analytic technique that uses all SUDS measurements available …