I personally call the "heart" the emotional seat, for emotions are what we feel with. What we sense with that causes us to feel the truth I consider to be more of our intuition. Every culture has a different emotional seat. The Hebrews used the Bowels. Some places use the Kidneys. Either way it's an emotional seat. Some may just seem more comical to think of as the Seat than others. The Heart is more Western, really. Heart also seems to make more sense because we normally feel strong emotions grip our chests.
Now, understanding the difference between the Mind and Brain is one of the longest-standing debates ever! It's kind of fun to discuss, but I don't advise debating on it. It's not worth it
No matter what, I do prefer saying heart rather than constantly saying "Emotinal Seat." I'm glued.