Written Exposure Therapy (WET)

Theory of change

The person changes by replacing avoidance of the traumatic memory with a repeated, emotionally engaged and sufficiently prolonged written confrontation that allows new learning and a reorganisation of meaning.

Core ideas

1. Avoidance maintains PTSD and repeated confrontation of the memory opens the way to change

   WET starts from the premise that avoiding trauma-related memories, images, thoughts, emotions and reminders prevents the person from obtaining new information about their capacity to tolerate the memory and about the difference between a memory and present danger. The treatment deliberately organises the opposite movement: returning again and again to the event in a controlled context and staying with it long enough for new learning to appear. Approach behaviour is thus the central operation of the protocol and explains why deviations that reduce contact with the memory are treated clinically as possible forms of avoidance. (Sloan & Marx, 2019, Written Exposure Therapy for PTSD; Sloan & Marx, 2024, State of the science: Written Exposure Therapy for the treatment of posttraumatic stress disorder).

2. The writing functions as structured imaginal exposure and not as simple emotional discharge

   WET's lineage begins in Pennebaker's expressive writing, but the clinical protocol was built by treating the written narrative as a precise form of exposure to the traumatic memory: a stimulus is defined, it is maintained for a fixed time, detail and emotional contact are required, it is repeated and fidelity is monitored. The therapeutic value is not attributed to writing about anything painful or to venting in an unspecific way, but to confronting systematically the representation of the trauma that the patient tends to avoid. (Pennebaker & Beall, 1986, Confronting a traumatic event; Sloan & Marx, 2004, A closer examination of the structured written disclosure procedure; Sloan & Marx, 2019, Written Exposure Therapy for PTSD).

3. The specificity of the stimulus matters: the same trauma is worked on repeatedly

   The development studies showed that writing repeatedly about the same event produced better outcomes than changing trauma between sessions, even when different memories were capable of generating negative affect. WET turns that finding into a clinical rule: a concrete index trauma is selected and kept as the focus of exposure, so that repetition allows work with a sufficiently stable representation of the memory instead of renewing the stimulus in each session. (Sloan, Marx, & Epstein, 2005, Further examination of the exposure model underlying the efficacy of written emotional disclosure; Sloan & Marx, 2017, On the implementation of Written Exposure Therapy with veterans diagnosed with PTSD).

4. Contact with the thoughts and emotions of the trauma is an active component of the protocol

   WET requires the narrative to contain both details of the event and the thoughts and emotions the person remembers having experienced during and immediately after it. This choice derives from studies in which instructions focused on emotional expression produced a more favourable pattern of outcomes than instructions oriented mainly towards insight or cognitive assimilation. Written exposure therefore seeks an affective engagement that is sufficiently intense and specific, while maintaining orientation to the present. (Sloan, Marx, Epstein, & Lexington, 2007, Does altering the writing instructions influence outcome associated with written disclosure?; Sloan & Marx, 2019, Written Exposure Therapy for PTSD).

5. Five thirty-minute exposures constitute an empirically derived clinical dose

   WET's format did not arise from arbitrarily shortening longer treatments. The classic emotional writing procedure of three twenty-minute sessions proved insufficient in a sample with a diagnosis of PTSD, and the subsequent pilot work led Sloan and Marx to establish five sessions with thirty minutes of writing as a dose capable of producing improvement. The brevity of the model is part of its experimental architecture and is combined with psychoeducation, an exposure rationale and review of adherence. (Sloan, Marx, & Greenberg, 2011, A test of written emotional disclosure as an intervention for posttraumatic stress disorder; Sloan & Marx, 2017, On the implementation of Written Exposure Therapy with veterans diagnosed with PTSD; Sloan et al., 2012, Written exposure as an intervention for PTSD).

6. The memory is confronted from a temporally distanced perspective

   WET's instructions place the patient in the position of someone remembering the trauma from the present, rather than asking for an immersion framed as though the event were literally happening now. This distance makes it possible to maintain two conditions simultaneously: sufficiently vivid access to the details, thoughts and emotions of the event, and preservation of the reference point that this is a memory. Sloan and Marx incorporated this feature on the basis of research on self-distancing in negative experiences. (Sloan & Marx, 2017, On the implementation of Written Exposure Therapy with veterans diagnosed with PTSD; Sloan & Marx, 2019, Written Exposure Therapy for PTSD).

7. Fidelity to the instructions is a clinical part of the treatment and not an administrative formality

   WET uses standardised scripts, thirty continuous minutes, review of the narratives and specific feedback because its development was based on experimentally modifying concrete components of the writing until a combination viable for PTSD was identified. The therapist checks that the patient writes about the right event, maintains enough detail, includes inner experience and completes the time, and corrects deviations without turning the therapy into an extensive interpretive conversation. The structure protects the dose and the quality of the exposure. (Sloan & Marx, 2019, Written Exposure Therapy for PTSD; Sloan & Marx, 2017, On the implementation of Written Exposure Therapy with veterans diagnosed with PTSD).

8. Meaning can be reorganised without explicit cognitive restructuring

   The final sessions extend the writing from the facts and emotions of the trauma towards its impact on life, relationships, meaning, the present and the future, but the therapist neither disputes beliefs nor prescribes corrective interpretations as in classical cognitive therapy. Contemporary research indicates that WET may be associated with cognitive adaptations related to better outcomes, which suggests that part of the reorganisation of meaning may emerge from the process of repeated exposure and writing. (Sloan & Marx, 2019, Written Exposure Therapy for PTSD; Sloan & Marx, 2024, State of the science: Written Exposure Therapy for the treatment of posttraumatic stress disorder).

9. The mechanism of change remains open and cannot be reduced to habituation

   The initial development of WET drew on extinction models and on emotional processing theory, which propose activation of the fear structure and incorporation of corrective information. Mechanism studies have found a relationship between improvement and initial emotional engagement and, on some measures, between-session changes, but physiological reductions within and between sessions do not appear as necessary conditions. Current formulations also consider inhibitory learning and cognitive adaptation, and the authors themselves note that isolating the exact causal mechanism remains difficult. (Foa & Kozak, 1986, Emotional processing of fear; Wisco, Baker, & Sloan, 2016, Mechanisms of change in written exposure treatment of posttraumatic stress disorder; Sloan & Marx, 2024, State of the science: Written Exposure Therapy for the treatment of posttraumatic stress disorder).

10. WET is a brief stand-alone treatment with minimal out-of-session burden

    Sloan and Marx conceived WET as a complete treatment for PTSD and made clear expressly that its brevity does not make it a compulsory preparatory phase before another therapy. The protocol concentrates the work in five sessions, omits formal between-session assignments and asks only that the person not suppress the memories and emotions that arise spontaneously. Later trials have shown that this brief dose can be non-inferior to more extensive treatments such as CPT and PE in certain samples, with generally lower dropout rates, although the individual response must be re-evaluated at the end and may require further treatment. (Sloan & Marx, 2017, On the implementation of Written Exposure Therapy with veterans diagnosed with PTSD; Sloan et al., 2018, A brief exposure-based treatment vs cognitive processing therapy for posttraumatic stress disorder; Sloan et al., 2023, Written Exposure Therapy vs Prolonged Exposure Therapy in the treatment of posttraumatic stress disorder; DeJesus, Trendel, & Sloan, 2024, A systematic review of Written Exposure Therapy for the treatment of posttraumatic stress symptoms).

Influences

• Expressive writing / Written Emotional Disclosure
• Exposure therapy
• Emotional Processing Theory
• Learning theory and extinction
• Cognitive adaptation
• Self-distancing

Key references

• Pennebaker, J. W., & Beall, S. K. (1986). Confronting a traumatic event: Toward an understanding of inhibition and disease. Journal of Abnormal Psychology, 95(3), 274–281. https://doi.org/10.1037/0021-843X.95.3.274.
• Foa, E. B., & Kozak, M. J. (1986). Emotional processing of fear: Exposure to corrective information. Psychological Bulletin, 99(1), 20–35. https://doi.org/10.1037/0033-2909.99.1.20.
• Sloan, D. M., & Marx, B. P. (2004). A closer examination of the structured written disclosure procedure. Journal of Consulting and Clinical Psychology, 72(2), 165–175. https://doi.org/10.1037/0022-006X.72.2.165.
• Sloan, D. M., & Marx, B. P. (2004). Taking pen to hand: Evaluating theories underlying the written disclosure paradigm. Clinical Psychology: Science and Practice, 11(2), 121–137. https://doi.org/10.1093/clipsy/bph062.
• Sloan, D. M., Marx, B. P., & Epstein, E. M. (2005). Further examination of the exposure model underlying the efficacy of written emotional disclosure. Journal of Consulting and Clinical Psychology, 73(3), 549–554. https://doi.org/10.1037/0022-006X.73.3.549.
• Sloan, D. M., Marx, B. P., Epstein, E. M., & Lexington, J. M. (2007). Does altering the writing instructions influence outcome associated with written disclosure? Behavior Therapy, 38(2), 155–168. https://doi.org/10.1016/j.beth.2006.06.005.
• Sloan, D. M., Marx, B. P., & Greenberg, E. M. (2011). A test of written emotional disclosure as an intervention for posttraumatic stress disorder. Behaviour Research and Therapy, 49(4), 299–304. https://doi.org/10.1016/j.brat.2011.02.001.
• Sloan, D. M., Marx, B. P., Bovin, M. J., Feinstein, B. A., & Gallagher, M. W. (2012). Written exposure as an intervention for PTSD: A randomized clinical trial with motor vehicle accident survivors. Behaviour Research and Therapy, 50(10), 627–635. https://doi.org/10.1016/j.brat.2012.07.001.
• Wisco, B. E., Baker, A. S., & Sloan, D. M. (2016). Mechanisms of change in written exposure treatment of posttraumatic stress disorder. Behavior Therapy, 47(1), 66–74. https://doi.org/10.1016/j.beth.2015.09.005.
• Sloan, D. M., & Marx, B. P. (2017). On the implementation of Written Exposure Therapy (WET) with veterans diagnosed with PTSD. Pragmatic Case Studies in Psychotherapy, 13(2), 154–164.
• Sloan, D. M., Marx, B. P., Lee, D. J., & Resick, P. A. (2018). A brief exposure-based treatment vs cognitive processing therapy for posttraumatic stress disorder: A randomized noninferiority clinical trial. JAMA Psychiatry, 75(3), 233–239. https://doi.org/10.1001/jamapsychiatry.2017.4249.
• Sloan, D. M., & Marx, B. P. (2019). Written Exposure Therapy for PTSD: A Brief Treatment Approach for Mental Health Professionals. American Psychological Association. https://doi.org/10.1037/0000139-000.
• Sloan, D. M., Marx, B. P., Resick, P. A., Young-McCaughan, S., Dondanville, K. A., Straud, C. L., Mintz, J., Litz, B. T., & Peterson, A. L. (2022). Effect of Written Exposure Therapy vs Cognitive Processing Therapy on increasing treatment efficiency among military service members with posttraumatic stress disorder: A randomized noninferiority trial. JAMA Network Open, 5(1), e2140911. https://doi.org/10.1001/jamanetworkopen.2021.40911.
• Sloan, D. M., Marx, B. P., Acierno, R., Messina, M., Muzzy, W., Gallagher, M. W., Litwack, S., & Sloan, C. (2023). Written Exposure Therapy vs Prolonged Exposure Therapy in the treatment of posttraumatic stress disorder: A randomized clinical trial. JAMA Psychiatry, 80(11), 1093–1100. https://doi.org/10.1001/jamapsychiatry.2023.2810.
• DeJesus, C. R., Trendel, S. L., & Sloan, D. M. (2024). A systematic review of Written Exposure Therapy for the treatment of posttraumatic stress symptoms. Psychological Trauma: Theory, Research, Practice, and Policy. Advance online publication. https://doi.org/10.1037/tra0001659.
• Sloan, D. M., & Marx, B. P. (2024). State of the science: Written Exposure Therapy for the treatment of posttraumatic stress disorder. Behavior Therapy, 55(6), 1222–1232.