@sonship saidI believe context determines the meaning of the terms.
Of course the heart mentioned in the Bible is psychological and spiritual usually rather than the physical organ.
The heart in the Bible is composed of the mind, will, emotion, and conscience.
These four functions of man's inward being comprise the heart.
Biblically, the heart is the deepest part of and the essence of ones being, and is relative to the mind with regards to thought and consciousness.
The soul refers to our inner emotions, sometimes called the bowels from which the will emanates.
The brain is the conjunctive organ between our heart and soul, and facilitates awareness of this world.
Just my two cents. Not going to be dogmatic about. It's a far cry from what an atheist thinks he believes.