A total anecdote, and I know the research is ongoing, but as a person who had rather worse depression because of an underlying problem that has since been treated, I would have a to say a comparison between how I used to feel about events, versus how I feel about them now, is spot on like this article says. Before my treatment, my memory of the past at that time (err, looking now back at it) I very much over generalized problems or overly categorized events as "typical" for how such events always are. Today, as I write this, I don't seem to look back at any of it like that, at least, not as much.