Is the ‘mind’ something of the physical realm? Or is it something immaterial, like Descartes and Plato suggest?
For the materialist or physicalist theory of science mind, and also consciousness, is just a product, or emergent property, of neuronal activity, thus finally of matter/energy. From some philosophical perspectives, however, mind (a prolongation of pure consciousness in the individual) is not so reducible. The brain is like a power-house, but not the power-source.
Consciousness is primary, indefinable, without attributes, and cannot be accounted for through the use the tools of science, in the same way that my subjectivity (subjective experience) cannot be objectified. This account is variously defined as monism or non-duality.