The mind is what the brain does; not who you are.
The soul is an idea that would seem to have testable consequences. Specifically, if the human mind is the product of a "ghost in the machine" and not simply the result of electrochemical interactions, then the mind should not be dependent on the physical actions of the brain that houses it. In short, there should be aspects of the mind that owe nothing to the physical functioning of the brain.
Modern scientific innovations have thrown light on the subject. Medical techniques such as CAT scans (short for computed axial tomography), PET (positron emission topography), and MRI (magnetic resonance imaging) allow the structure and function of the living brain to be studied. Scientists can see which areas of the brain "light up" with activity when a healthy person performs a mental task, or they can examine patients who have suffered injury or disease to see which parts of the brain, when damaged, correspond to which types of deficits of neural function.
And already, a disappointing result for theists has emerged. Some mental functions are localized, while others are more diffuse, but there is no aspect of the mind that does not correspond to any area of the brain. In fact, we know precisely which brain regions control many fundamental aspects of human consciousness.
Who then, is YOU?
Whoever or whatever I AM must be responsible for three things: identity, personality, and behavior. Simply stated, identity is consciousness, self-awareness, recognizing myself as a distinct and autonomous being that is continuous through time.
These three things (identity, personality and behavior) are not separate from the brain, are not even linked to the brain, but are unified with the brain. The evidence shows that they are completely determined by the physical configuration of the brain, and that a change to this configuration can alter, reduce or eliminate any of them.
Do you have a problem with this?
Do you think that you are MORE than what your brain does?
Why? What evidence do you present to yourself?
Who is you?
(The above is a condensed version of an interesting webpage EBON MUSINGS which I thought might lead to interesting discussion.)