The Flash Technique: what recent research can tell us

People looking for help with distressing memories often want an approach that feels manageable. Research on the Flash Technique is growing, but different studies answer different questions. Reduced distress about a memory is not automatically the same as recovery from PTSD.

A small 2026 trial examined cognitive flexibility

Zeng and colleagues randomly assigned 54 college students with childhood trauma histories to six weekly 70-minute Flash sessions or a waitlist. The intervention group improved on self-reported flexibility and the time needed to switch between tasks; the error-rate measure did not show a significant group-by-time effect. The study concerned cognitive flexibility in this particular student sample. It did not establish PTSD remission or show that Flash outperforms an established trauma therapy. Read the 2026 randomized trial.

Earlier findings are encouraging but preliminary

A 2024 report combined four workshop studies involving 654 participants and 813 Flash sessions. Participants reported substantial reductions in memory-related disturbance. These were uncontrolled before-and-after studies, largely in training settings, with follow-up limitations. Without a comparison group, they cannot isolate the intervention’s effects or establish how it performs in routine PTSD treatment. Read Manfield and colleagues’ report.

Flash, EMDR, and FlashVR are different claims

The VA/DoD guideline recommends established trauma-focused treatments including EMDR, Cognitive Processing Therapy, and prolonged exposure. That recommendation should not be transferred automatically to Flash. See the guideline overview.

Likewise, studies of the Flash Technique do not validate a particular virtual-reality implementation. FlashVR requires evidence about that implementation; it should not be described as proven equivalent simply because the names are related.

Questions to bring to a consultation

Ask what the proposed method is intended to help with, what evidence supports that use, how progress will be assessed, and what alternatives are available. A clear explanation should include uncertainty as well as potential benefits.

Learn about Flash and FlashVR at the practice, EMDR, and what to expect when starting therapy.

Educational information; not a diagnosis or an individual treatment recommendation.