Connection is one thing and front and center completely different. Heart is a pump, it gets signals from brain like every other organ, but again heart acts more like slave to signals from brain, where the processing of everything happens including emotions.... I don't think 1400 years ago people knew that, they had no idea every other organ is just mechanical only, that's why literature is so wrong about the importance of heart.
I also think religious literature is completely wrong about the concept of 'Ru'(soul), there is nothing outside of our organic matter body that is so vital or critical to our intelligence or life. This is again old myth with no evidence... More we are learning about brain, it is getting clear, our body is all inclusive nothing sits outside...BTW: Concept of soul(like heart) is not patented by religion, it's origin is from older philosophical literature, religion just piggy backed on it, like most of it concepts which were borrowed from past culture or where it originated. There is very little that is original anyway.