Tesla MRI machine uncovers new insights into PTSD

Advanced brain imaging is helping scientists better understand why some people with post-traumatic stress disorder (PTSD) struggle with the most common form of treatment. A new study published in Nature Mental Health points to underlying brain processes that may explain why certain therapies help some patients but are less effective for others, and the findings could lead to more tailored treatments in the future.

According to Associate Professor Trevor Steward, who leads the Brain and Mental Health Hub at the University of Melbourne, individuals with PTSD frequently become trapped in persistent negative thoughts about themselves and their surroundings.

Cognitive behavioral therapy (CBT) is often used to address this problem. One of its techniques, known as cognitive restructuring, encourages patients to identify harmful or irrational thoughts and actively replace them with healthier ones. Steward explained that until now researchers had little understanding of what occurs in the brain when patients attempt this process.

The study identified a particular brain pathway involved in how people with PTSD try to challenge those negative beliefs. Researchers found that the brain’s control regions appeared less effective at regulating a deeper relay center called the thalamus. When communication between these areas was weaker, participants tended to hold stronger negative beliefs about themselves and the world.

To observe these brain interactions, scientists used a powerful 7-Tesla MRI scanner at the Melbourne Brain Centre. The device produces far more detailed images of deep brain structures than the scanners typically used in hospitals.

Professor Kim Felmingham, chair of clinical psychology at the University of Melbourne and a prominent PTSD researcher, said the disorder has long been difficult to treat.

She noted that talk therapy benefits many patients but does not work equally well for everyone. The new findings help clarify the brain mechanisms involved when people undergo cognitive behavioral therapy, which could ultimately lead to improved or more personalized treatment approaches.

The study included two groups of participants: adults diagnosed with PTSD and adults who had experienced traumatic events but did not meet the criteria for the disorder.

Steward said negative thinking patterns are a common feature of PTSD. The research allowed scientists not only to identify which brain regions become active during these thought processes, but also to observe how those regions communicate with each other in people with the condition.

He compared the difference to observing an orchestra. Knowing which instruments are playing is one thing, he explained, but understanding who is directing them provides a deeper picture of how the performance comes together.

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