If you have been told you need trauma therapy, you have likely encountered two acronyms more than any others: EMDR (Eye Movement Desensitization and Reprocessing) and CPT (Cognitive Processing Therapy). Both are recommended as first-line treatments for PTSD by the American Psychological Association, the Department of Veterans Affairs, and the World Health Organization. Both have substantial evidence supporting their effectiveness. And yet they work in meaningfully different ways — which means the choice between them is not arbitrary.
Understanding how each approach works, what it demands of the client, and what the evidence says about comparative effectiveness is essential for making an informed decision. It is also useful for evaluating whether a therapist who claims to offer these treatments has the training to deliver them properly.
A comprehensive meta-analysis by Cusack et al. (2016) published in PLOS ONE examined 36 randomized controlled trials and concluded that both CPT and EMDR are effective treatments for PTSD, with large pre-to-post effect sizes. Head-to-head studies generally find comparable outcomes between the two. The APA's 2017 clinical practice guideline gives both treatments its strongest recommendation, noting that the choice between them may depend on patient preference, therapist expertise, and the nature of the traumatic experience.
How CPT works
Cognitive Processing Therapy is a structured, typically 12-session protocol developed by Patricia Resick. It focuses on identifying and modifying the distorted beliefs — called "stuck points" — that develop as a result of traumatic experiences. These beliefs often involve themes of safety, trust, power and control, esteem, and intimacy.
CPT is a language-heavy, analytical treatment. Clients write detailed accounts of their traumatic experience, examine the thoughts and meanings they have attached to it, and systematically evaluate whether those thoughts are accurate or distorted. Through guided worksheets and Socratic questioning, the therapist helps the client develop more balanced appraisals of the trauma and its implications.
CPT is well-suited for clients who are verbally oriented, comfortable with structured homework (worksheets are assigned between every session), and whose PTSD is significantly maintained by distorted beliefs about themselves, others, or the world. It is particularly effective when guilt and shame are prominent features of the post-trauma presentation, as it directly targets the thought patterns that sustain those emotions.
How EMDR works
EMDR, developed by Francine Shapiro, uses a different mechanism. Rather than primarily targeting cognitive distortions through language and analysis, EMDR focuses on processing traumatic memories through bilateral stimulation — typically guided eye movements, though tapping or auditory tones may also be used. The theory is that traumatic memories are stored in a maladaptive, unprocessed form, and that bilateral stimulation facilitates the brain's natural information processing system to integrate these memories into the broader memory network.
During an EMDR session, the client briefly focuses on the traumatic memory — including associated images, thoughts, emotions, and body sensations — while simultaneously engaging in bilateral stimulation. This process continues until the distress associated with the memory decreases and a more adaptive belief can be installed. EMDR follows an eight-phase protocol that includes history-taking, preparation, assessment, desensitization, installation, body scan, closure, and reevaluation.
EMDR may be better suited for clients who are less comfortable with detailed verbal processing of traumatic events, who experience significant somatic symptoms (body-based trauma responses), or who have difficulty articulating the cognitive dimensions of their distress. It requires less between-session homework than CPT, which may be relevant for clients with limited time or who find written exercises aversive.
How to evaluate a trauma therapist's training
For EMDR: formal certification matters
EMDR training involves a two-part foundational course (typically 50+ hours), followed by supervised practice and consultation. Full EMDR certification through EMDRIA (EMDR International Association) requires completion of at least 20 hours of consultation from an EMDR-approved consultant and a minimum number of supervised EMDR sessions. A therapist who attended a single introductory workshop but did not complete the supervised practice component is not adequately prepared to deliver EMDR. Ask whether they are EMDRIA-certified or EMDRIA-trained, and be aware that these represent different levels of commitment.
For CPT: protocol fidelity is key
CPT is a manualized treatment with a specific session-by-session structure. A trained CPT therapist can describe the 12-session protocol, explain the role of stuck points, and will assign written homework. The gold standard for CPT training involves completing a workshop followed by case consultation with an approved CPT consultant. Therapists listed on the CPT provider roster (maintained by the developers) have completed this full training pathway. A therapist who describes their approach as "kind of like CPT" or who uses elements of CPT without following the structured protocol is delivering a diluted version of the treatment.
Beware of Prolonged Exposure confusion
Prolonged Exposure (PE) is a third evidence-based trauma treatment that is sometimes conflated with EMDR or CPT. PE involves repeated, detailed recounting of the traumatic memory in session (imaginal exposure) combined with gradual approach to real-world situations the client has been avoiding (in vivo exposure). It is a distinct protocol with its own training pathway. A therapist who describes their approach as "a combination of EMDR and exposure" may be improvising rather than following any established protocol with fidelity.
Questions to ask a prospective trauma therapist
- "Which trauma protocol do you primarily use — EMDR, CPT, or Prolonged Exposure?"
- "Are you certified or formally trained in that approach? Through which organization?"
- "How many sessions does your typical trauma treatment involve?"
- "Do you follow the full protocol, or do you use elements of it?"
- "How do you decide which trauma approach is the best fit for a particular client?"
- "What does between-session homework look like in your approach?"
When neither is the right starting point
It is important to note that not every person with trauma symptoms is immediately ready for trauma-focused processing. Clients who are actively in crisis, who lack basic emotional regulation skills, or who are in unsafe living situations may benefit from a stabilization phase before beginning EMDR or CPT. Complex PTSD — resulting from prolonged, repeated trauma, particularly in childhood — may require a phased approach that addresses emotion regulation, relational patterns, and self-concept before or alongside direct trauma processing.
A thoughtful trauma therapist will assess readiness and discuss the rationale for their recommended treatment sequence. A therapist who begins EMDR or CPT in the first session without adequate preparation is not following best practices, regardless of their certification level.
Making the choice
If you are choosing between EMDR and CPT, the most pragmatic factors are therapist availability and training quality, your own processing style (verbal/analytical vs. experiential/somatic), your comfort with homework, and your preference for how directly you engage with the traumatic narrative. Both treatments work. The critical variable is that the therapist delivering them has completed proper training and delivers the protocol with fidelity — not a loosely adapted version based on partial workshop attendance.
References
- Cusack, K., Jonas, D. E., Forneris, C. A., et al. (2016). Psychological treatments for adults with posttraumatic stress disorder: A systematic review and meta-analysis. Clinical Psychology Review, 43, 128–141.
- Resick, P. A., Monson, C. M., & Chard, K. M. (2017). Cognitive Processing Therapy for PTSD: A Comprehensive Manual. Guilford Press.
- Shapiro, F. (2018). Eye Movement Desensitization and Reprocessing (EMDR) Therapy (3rd ed.). Guilford Press.
- American Psychological Association. (2017). Clinical Practice Guideline for the Treatment of PTSD.
- Foa, E. B., Hembree, E. A., & Rothbaum, B. O. (2007). Prolonged Exposure Therapy for PTSD. Oxford University Press.
- Cloitre, M., Courtois, C. A., Ford, J. D., et al. (2012). The ISTSS Expert Consensus Treatment Guidelines for Complex PTSD in Adults. Journal of Traumatic Stress, 25(6), 615–627.