Epiphenomenalism

The theory that bodily states cause mental states but mental states do not affect the body. These mental states are the effects of physical processes (brain and nervous system). An epiphenomenon is a phenomenon that lacks causal efficacy. In the philosophy of mind, this would be the claim that while mental states are caused by physical states, they do not have any causal influence on the physical world since mental-physical interaction only operates in one direction).