The classic puzzle game Tetris, known for its deceptively simple gameplay, is showing promise as a therapeutic tool for individuals grappling with trauma. A recent clinical trial conducted by researchers at the University of Cambridge has demonstrated that playing Tetris can significantly reduce the frequency of intrusive memories, particularly among healthcare workers exposed to traumatic events during the COVID-19 pandemic.
The study, slated for publication in the March 2026 issue of The Lancet Psychiatry, focused on frontline healthcare staff in the United Kingdom who experienced heightened levels of post-traumatic stress. Researchers found that a digital intervention utilizing Tetris markedly decreased the occurrence of flashbacks – the involuntary and distressing re-experiencing of traumatic memories. This finding builds on earlier research suggesting the potential of visually-competing tasks to disrupt the consolidation of traumatic memories.
Post-traumatic stress disorder (PTSD) is often characterized by these intrusive recollections, where vivid images of shocking experiences unexpectedly resurface. During the COVID-19 pandemic, healthcare professionals were repeatedly confronted with intensely stressful situations, leading to a substantial increase in PTSD rates. According to reports, the prevalence of PTSD among National Health Service (NHS) staff in the UK rose from 13% before the pandemic to 25% at its peak. These individuals often reported distressing flashbacks of “failed resuscitation attempts” and “families collapsing in grief.”
How Tetris Impacts Traumatic Memories
The effectiveness of Tetris in mitigating flashbacks is believed to stem from its ability to occupy cognitive resources involved in visual memory processing. When a traumatic memory begins to form, the brain attempts to consolidate it – essentially, to store it for long-term recall. Tetris, with its constant demand for spatial reasoning and visual attention, interferes with this consolidation process. By engaging the brain in a demanding, yet non-emotional, task, the game appears to disrupt the formation of strong, lasting traumatic memories.
The Cambridge research team conducted a clinical trial with UK healthcare workers, utilizing a digital Tetris intervention. The results indicated a substantial reduction in the frequency of traumatic flashbacks among participants. The study utilized a Bayesian adaptive randomized clinical trial design, a rigorous methodology for evaluating interventions.
Rising PTSD Rates Among Healthcare Workers
The pandemic significantly exacerbated the mental health challenges faced by healthcare workers globally. The constant exposure to suffering, death, and the fear of infection created a uniquely stressful environment. The increase in PTSD rates among NHS staff, from 13% to 25%, highlights the profound psychological toll of the pandemic, as reported by the UK’s National Health Service. Many continue to perform in similarly demanding conditions, making ongoing support and preventative measures crucial.
Previous research, published in BMC Medicine on September 19, 2024, also explored the employ of Tetris to reduce trauma-related memories. That study, conducted by Uppsala University in Sweden, found that playing 20 minutes of Tetris daily for five weeks significantly reduced the frequency of intrusive traumatic memories in healthcare workers exposed to trauma during the pandemic.
Looking Ahead
The findings from both the University of Cambridge and Uppsala University studies suggest that Tetris could be a valuable, accessible, and cost-effective tool for managing trauma. Further research is needed to determine the optimal dosage and duration of Tetris play for therapeutic benefit, as well as to explore its effectiveness across different populations and types of trauma. The upcoming publication in The Lancet Psychiatry is expected to provide further insights into the mechanisms underlying Tetris’s therapeutic effects and guide future clinical applications.
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