The doctrine that considers the facts of the universe to be sufficiently explained in physical terms by the existence and nature of matter. The facts of the universe could be described in physical terms and explained by the properties of matter and energy. (Related to mechanism) there are physical rules for everything, and you have to follow these while explaining things. The materialists' work on mental processes focused in physical properties, that is, the anatomical and physiological structures of the brain.Simple ideasComplex ideasMaterialism