Practicing awareness of one's heartbeat, such as during meditation, strengthens the connections between the body and the brain and improves one's ability to sense their internal state.

“When you stop taking in extterosceptive information, information from the outside world by closing your eyes and focusing inward as they say, you start paying attention to your breathing cadence. You start directing your mind's attention to your heart rate. And if you can start to perceive your hear”