Despite this evidence, the mechanism of change for ERRT remains unclear. We propose to conduct a set of case series in order to examine the possible mechanisms: psycho-education, dose response for exposure, and no exposure components of the treatment. Each part of the treatment is theorized to contribute to the improved treatment outcome and it is hypothesized that participants will benefit no matter what group they are in. All participants will receive 5 treatment sessions, conducted twice per week for about 90 minutes, of a modified version of ERRT.