  Antony (1991) replies that there is no symmetry here, at least not given anomalous monism. While the decision’s physical properties screen off its mental properties, the reverse doesn’t hold. Suppose again that the cause had lacked its physical properties but had still been a decision to turn on the light. On anomalous monism, Antony argues, there’s no saying what Gus’s decision would have caused, for mental properties, being anomalous, place no constraints on the causal structure of the world. (See also Leiter and Miller 1994.)