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By the time they hit 15, teenage girls are twice as likely as teenage boys to suffer from depression.

This could be because girls tend to think more negatively, dwelling on social and body image stressors. They’re also more likely to have experienced sexual abuse and other negative events. On a biological level, their hormones fluctuate more and they’re more vulnerable to inflammation.

A group of scientists from the U.K. and the U.S. wanted to understand what was happening in the brains of depressed teenage boys versus depressed teenage girls. They hooked up both depressed and non-depressed boys and girls to fMRI equipment and gave them a task: Press a button when you see a happy word. Don’t press it when you see a sad word. (Such an activity puts something called cognitive control to the test. Impaired cognitive control has been associated with depression.) Then they watched what happened in the subjects’ brains.

To keep it simple, they saw differences between the sexes, specifically in the brain’s supramarginal gyrus (an area thought to be involved in emotional responses) and posterior cingulate (an area associated with control, awareness, and memory). When faced with a cognitive control task, there’s a lot less activation going on for males with depression compared to healthy males–depressed and healthy female brains were relatively similar in that situation.

So what does this new knowledge do for the study of depression? It emphasizes that teenage boys and teenage girls suffering from depression have different things going on in their brains. The way we treat –and try to prevent –the disorder should, therefore, be different.

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