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May be our brain’s way of telling us to stop and solve a problem

At any given time, about 5% of Americans are reporting symptoms of moderate or severe depression. Major depressive disorder is so common that it’s estimated one in six Americans will have it at some point in their lives.

The prevalence of depression presents economic problems as well — it’s one of the most common causes of disability, it has effects in the workplace, and it’s responsible for a host of suicide-related costs. The economic burden of depression in the US was estimated to be $210.5 billion in 2010.

So why does such a debilitating condition affect so many people?

The traditional understanding is that depression is a breakdown in the way things are supposed to work in the brain — chemical imbalances that can be righted through a combination of medication and behavioral shifts.

But there’s also a theory that instead of being purely a disorder, depression might be a specific behavioral strategy that we’ve evolved — a biological adaptation that serves a purpose. As Matthew Hutson explains in a Nautilus feature on the potential evolutionary roots of depression and suicidal behavior, that purpose might be to make us stop to understand and deal with an important problem.

Hutson says the evolutionary psychologist Paul Andrews and the psychiatrist J. Anderson Thomson first elaborated on this idea, called the “analytical rumination hypothesis,” in an article published in Psychological Review in 2009.

The basic concept is that what we think of as a disorder is actually a way our brains analyze and dwell on a problem in the hopes of coming up with a way to deal with it. The researchers suggest it’s possible that a difficult or complex problem triggers a “depressive” reaction in some people that sends them into a sort of analytical mode.

With depression, Hutson writes, “there’s an increase in rumination, the obsessing over the source of one’s pain” along with increased analytical activity in the brain and REM sleep, which helps with memory processing. A major symptom of depression is anhedonia, the inability to get pleasure from normal activities. According to this approach, those things could be disrupting this “processing” phase.

This hypothesis would account for the fact that most depressive episodes occur after a significant life event like a death or the end of a relationship.

In their 2009 paper, Andrews and Thomson even suggest that this idea could explain why depression and anxiety frequently occur together.

“We hypothesize that depression and anxiety often co-occur because some problems require both analysis (promoted by depressed affect) and vigilance (promoted by anxiety),” they wrote. Analysis allows someone to understand the inciting factor; vigilance is a way of trying to prevent it from happening again.


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