A Misguided Concept
Many of today's scientists reject the ontology of mind and free-will. A popular view of the mind is that it is an epiphenomenon of the brain—something like the wake of a boat going through the water. The boat's wake is an effect of the boat moving through the water. So they believe the human mind and free will are solely the effects of material causes. Hence, mental states are just the splashing effects of our determinate bio-physical properties that are governed by the fixed laws of chemistry and physics.