DanielLC comments on You Can Face Reality - Less Wrong
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Do you have any references to that? Yes. They do underestimate the probability their their depression will end, however (I'll see if I can find the link to where I read that, it was likely another GMU blogger). I don't know about other cognitive biases in the depressed.
Wikipedia now has an article on depressive realism.
It looks like there's still some serious controversy on the issue.
But suppose for a moment that it's true: Suppose that depressed people really do have more accurate beliefs, and that this really is related to their depression.
What does this mean for rationality? Is it more rational to be delusional and happy or to be accurate and sad? Or can we show that even in light of this data there is a third option, to actually be accurate and happy?
If you're an egoist, it's best to be delusional and happy. If you're not, the needs of others outweigh your own. Of course, even if depressed people are more accurate, that doesn't mean that they're more productive. Then again, they may be able to use their more accurate beliefs to find a better charity and make up the difference. Of course, you could just have a depressed philanthropist tell you where to donate.
Depressive people are definitely accurate on certain things. But they have lost their hopes. They are not seeing the whole picture. We must live and we must help others to live.