Recent Advances in Natural Language Processing
I'd go one step further: Humans themselves don't understand anything, we are just good at constructing logical-sounding (plausible, testable) stories about things. These are mental models, and it's the only way we can make reasonable predictions to within error tolerances of our day-to-day experience, but they are flat-out lies and stories we tell ourselves not based on a high-fidelity understanding of anything.<p>Rumination, deep thinking, etc is simply actor-critic learning of these mental models for story-telling.