John_Mann,
........By what mechanism can an immaterial soul possibly alter the state of the body which is made of matter or affect the brain which is made of matter?
"Neuroplasticity. Intentional behaviour changes the matter in the brain."
Definition of Neuroplasticity according to http://www.medicinenet.com/script/main/mobileart.asp?articlekey=40362:
"The BRAIN'S ability to reorganize itself by forming new neural connections throughout life. Neuroplasticity allows the neurons (nerve cells) in the BRAIN to compensate for injury and disease and to adjust their activities in response to new situations or to changes in their environment.
BRAIN reorganization takes place by mechanisms such as "axonal sprouting" in which undamaged axons grow new nerve endings to reconnect neurons whose links were injured or severed. Undamaged axons can also sprout nerve endings and connect with other undamaged nerve cells, forming new neural pathways to accomplish a needed function.
For example, if one hemisphere of the BRAIN is damaged, the intact hemisphere may take over some of its functions. The BRAIN compensates for damage in effect by reorganizing and forming new connections between intact neurons. In order to reconnect, the neurons need to be stimulated through activity."
There is no mention of an immaterial soul in this definition so obviously there is no known mechanism by which an immaterial soul could possibly alter the state of the body or affect the brain which are both made of matter.
Also, it seems you are admitting that the soul is in fact the brain? I thought they were separate and independent of each other?
"The soul needs the brain to be functional in order to interact in the material world."
As stated above, there is no known mechanism by which an immaterial soul could possibly alter the state of the body or affect the brain which are both made of matter, so I do not see how it's possible for the soul to need the brain.