I believe the term 'mind' in our common parlance encompasses a great deal of territory, from memory to sensual perception to reasoning.
Orthodox terminology, at least from my limited knowledge, doesn't rely on this imprecise term. The brain isn't mentioned so much because it was not understood as it is now. Deep thought was associated with the heart, which we now think of as the seat of emotion.
This is just my opinion, but I see the brain not as the seat or location of the mind, but rather as the antenna that helps connect the body and the soul and spirit together. This is why brain injury is so complex, since scientists look at the brain as a data storage device rather than a signal processor. Since they can't measure the 'soul signal' they assume it is not there. Brian damage, like breaking an antenna, can effect signal quality and interfere with our perceptions. When the brain is injured or negatively effected, it further distorts our perceptions and limits our already hampered reason.
According to the Fathers, human awareness is made up of body, soul and spirit perceptions, which are scattered. Due to our limits, we are never totally aware of all three aspects at one time, and so our focus bounces around randomly. There is a need to gather the awareness together, to bring stillness to the inner self (in a way, the mind or the heart, depending on what your terminology is) and thus greater awareness of the total self.
