Given my own experience with depression, it makes some amount of intuitive sense. For me at least, "sadness" is not wrong, but other than that it doesn't describe the experience very well at all. When I'm really down, I can't bring myself to care about "aversive events". I might even welcome them a little bit, both because they fit my understanding better (everything is proceeding as it should be, this ant eating my…
This is how SSRI has felt for me also, incidentally: an even deeper apathy, setting in from lack of any emotion at all.