As far as I'm concerned ones mind is the activity of ones brain. This is a form of "dualism" since it says that mind and brain are different concepts, but it is also a form of "materialism", since ones brain is composed of matter. I really don't see that there is any philosophical problem here at all. If there is any problem it is just in our primitive knowledge of neuroscience, that is of exactly how our brains work. But I suppose that's what makes it a "philosophical" problem as opposed to a real one!