> I omitted the word "negative" from the quote as that part I don't think is universal.
For a definition of "depression", it is. If somebody always believes that everything is great, regardless of the evidence, that might be a problem, but that problem would not be called "depression".
> Isn't this what brains do typically, outside of depression?
No; the theory is that typical brains do a certain amount of consideration of new evidence, and depressed brains do less than that.
The same article goes on to point out that there must be more to it, since as described this model would still result in depression naturally clearing up.
For a definition of "depression", it is. If somebody always believes that everything is great, regardless of the evidence, that might be a problem, but that problem would not be called "depression".
> Isn't this what brains do typically, outside of depression?
No; the theory is that typical brains do a certain amount of consideration of new evidence, and depressed brains do less than that.
The same article goes on to point out that there must be more to it, since as described this model would still result in depression naturally clearing up.