A newest article at Scientific American summarizes several recent studies that conclude that depression is not a malfunction, but a mental adaptation
that brings certain cognitive advantages.
Depression's Evolutionary Roots
So what could be so useful about depression? Depressed people often think intensely about their problems. These thoughts are called ruminations; they
are persistent and depressed people have difficulty thinking about anything else. Numerous studies have also shown that this thinking style is often
highly analytical. They dwell on a complex problem, breaking it down into smaller components, which are considered one at a time.
This analytical style of thought, of course, can be very productive. Each component is not as difficult, so the problem becomes more tractable.
Indeed, when you are faced with a difficult problem, such as a math problem, feeling depressed is often a useful response that may help you analyze
and solve it. For instance, in some of our research, we have found evidence that people who get more depressed while they are working on complex
problems in an intelligence test tend to score higher on the test.
The studies that the article draws from are:
On being sad and mistaken: Mood effects on the accuracy of thin-slice
judgments.
Depression and the impression-formation continuum: Piecemeal
processing despite the availability of category information.
Attending to the big picture: mood and global versus local processing of visual information.
For the longest time I have considered several "malfunctions", "maladies", "disorders", or "diseases" to be beneficial rather than
detrimental. I personally have several sleep disorders that individually they would seem to be detrimental, but together they function as a great
benefit (Apnea, Narcolepsy and Insomnia). From my own personal experience with periodic Depression, I have concluded the same as these studies have as
well (although granted, I was never so dysfunctional from Depression that I ever needed treatment).
We sometimes forget that the purpose of Nature and Evolution is to adapt to one's environment for the purpose of survival. Even though humans have
eliminated Darwinism now that we have made our way to the top of the Evolutionary Food-Chain, we haven't eliminated the innate biological necessity
to continue to adapt and evolve. Although Nature will attempt all possible evolutionary mutations, allowing the useless ones to be weeded out
naturally, the majority of evolutionary mutations are going to naturally be beneficial in some form.
At some point we have to get over this Aristotlean premise that everything in this world is corrupted and consider the possibility that everything is
this world is
inpotentia (or "full of potential" for those who are Latin impaired).
[edit on 27-8-2009 by fraterormus]