You probably know someone who has tried an antidepressant that just did not work for them. Or who switched pills twice before anything clicked. It is one of the most common frustrations in treating depression.
Now a Finnish team may have part of the answer. In a study published in Nature Mental Health, researchers at the University of Helsinki found that depression is not one condition in the brain. It looks like five.
Each profile shows a different wiring pattern on a scan, and each tracks a different mix of symptoms. The researchers used magnetoencephalography, or MEG, a brain-imaging method that picks up the tiny magnetic fields generated when neurons fire.
MEG records activity millisecond by millisecond, closer to real time than most scans. The team measured 263 adults with major depressive disorder and 75 healthy controls, then mapped how brain regions were talking to one another.
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The five brain profiles behind one diagnosis
What they saw was not one depressed brain. It was five.
The first group showed strong connections across the brain and the broadest set of severe symptoms, including anxiety, rumination, and problems functioning day to day. The second group had weak overall connectivity and milder symptoms than the rest.
The third group showed widely reduced connectivity, and here trauma symptoms resembling PTSD stood out. The fourth group had a mix of over-active and under-active connections, alongside heavy depression, substance misuse, and low well-being.
The fifth group had the strongest connectivity of any group, with substance misuse prominent and fewer trauma symptoms. What struck the team was how opposite some of these patterns were.
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Satu Palva, who directs the Neuroscience Center at the University of Helsinki, led the work. "What was particularly interesting was the contrasting patterns of brain activity found under the umbrella of the same depression diagnoses," she said.
Why the same pill does not help everyone
That matters for treatment. If two patients share a diagnosis but have opposite wiring, it would be a surprise if the same drug worked equally well for both.
Yet that is roughly how prescribing works today. A patient tries one antidepressant, waits several weeks to see if it helps, and if not, tries another.
The hope attached to the Finnish work is that a scan might one day point each person toward the therapy their biology responds to.
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What this does and does not mean today
The researchers are careful about what the finding does not yet mean. Current brain measurements cannot tell a doctor which medication to prescribe.
The patterns need to be replicated in larger groups and linked directly to specific treatments before a clinician could rely on a scan to choose a therapy.
Anyone currently taking medication for depression should keep taking it and talk to their doctor before making any change.
The team said the next step is testing whether each of the five profiles responds differently to specific drug classes or forms of therapy.
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This article is made and published by Aksel Kryhlmand, who may have used AI in the preparation.