Nothing so blights the lives of all-the sufferer, their families, their friends-as a disorder of the mind. Sadly, and despite the hard work of many hard-working and intelligent people, there is no simple cause-and-effect model for these problems. Not that is, in the same way as there is for diseases of the body, many of which have been tracked to causative organisms or simple deficiencies in some vital element. Instead of looking for a single, all-encompassing theory, like so many Darwins or Pasteurs, a better way ahead through small studies in limited areas, to create smaller learnings of which we can be sure.
A recent study of depression, using techniques like Nuclear Magnetic Resonance(NMR) suggests that this way pays off. It really does look as if certain areas of the brain, called Salience Networks( which seem to have something to do with directing the brain’s attention) may be directly involved. Read this from Nature Briefings, Permanent Brain Wiring Predicts Depression The link to the heavier article is well worth it-it’s quite short and clearly written
Although depression comes and goes, people who are prone to it retain a distinct pattern of brain-wiring network throughout their lives. An analysis of more than 180 functional magnetic resonance images showed that compared with healthy controls, people with clinical depression have larger brain circuits called salience networks, which shape what the brain pays attention to. These networks become more active during a depressive episode but persist even after the depression lifts. Researchers found large salience networks in children as young as nine years old, who then went on to develop depression as teenagers. This suggests that the trait could increase the risk of depression, rather than being a result of it.Nature | 4 min read
Reference: Nature paper
We liked several things about this work. It’s humble; it doesn’t try to solve everything, but defines a small area and attempts to explore only that. The sample sizes are gratifyingly large, especially in the follow up study. Above all, it provides a tangible repeatable way ahead to slowly isolate and characterise other disorders at a neurological level. One day, perhaps, and just maybe, some Historian of the future may point back and say: “this was a real step forward.”
#mental illness #depression #nmr #health #medicine
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