I know, I know: most people would dismiss this, and other forms of alternative medicine, as 'pseudo - profound bullshit' (I was extremely surprised at the narrow-mindedness of that Independent article by the way). but Bradley Nelson really seemed to hit the nail on the head with that observation. Who can really say they've never experienced a sudden numbness, defiance, even carelessness after trauma resulting from the heart-wall?
Anyway, my criteria for good art now is that it has to pull down the heart wall. Not just tug at the heartstrings holding it up but pull the whole damn thing down till you feel utterly defenceless, vulnerable, but alive.
A Tarkovsky film, Astrid Lindgren's short stories, a Bach prelude.. they all do the trick.