account for brain capacities and distinctiveness. Soul and mind are understood as physiologically embodied. This model is nonreductive in the sense that human behavior cannot be exhaustively explained by analysis at the lowest level (bottom-up explanations). Rather, higher level (top-down) explanations supervene statements about the physiological. In this monist model, nature, body, soul, mind, spirit or any other description all refer to the same entity. An important element in the nonreductive