Heart like Chinese hsin-hsin, or the Atman, meaning the deepest place of truth. The deepest intuitive place in one's being. When there is a lot of fear, there's a lot of uncertainty. When there's a lot of uncertainty, there is usually a lot of fear attendant to it. How people react to fear is interesting.
Some people just consume more.
They become more and more materialistic. Some people want to be on the right side when the doors close, so they become fundamentalists in one sense or another. They grab onto right as opposed to evil. They want to be one of the 144,000 that gets in the door. And the other group uses the uncertainty as a way to deal with their inner relationship to uncertainty, and they go inward.