Computationalists respond that this objection assumes what is to be shown: that cognitive activity does not fall into explanatory significant discrete stages (Weiskopf 2004). Assuming that physical time is continuous, it follows that mental activity unfolds in continuous time. It does not follow that cognitive models must have continuous temporal structure. A personal computer operates in continuous time, and its physical state evolves continuously. A complete physical theory will reflect all those physical changes. But our computational model does not reflect every physical change to the computer. Our computational model has discrete temporal structure. Why assume that a good cognitive-level model of the mind must reflect every physical change to the brain? Even if there is a continuum of evolving physical states, why assume a continuum of evolving cognitive states? The mere fact of continuous temporal evolution does not militate against computational models with discrete temporal structure.