Computationalists respond that we can supplement an abstract computational model with temporal considerations (Piccinini 2010; Weiskopf 2004). For example, a Turing machine model presupposes discrete “stages of computation”, without describing how the stages relate to physical time. But we can supplement our model by describing how long each stage lasts, thereby converting our non-temporal Turing machine model into a theory that yields detailed temporal predictions. Many advocates of CTM employ supplementation along these lines to study temporal properties of cognition (Newell 1990). Similar supplementation figures prominently in computer science, whose practitioners are quite concerned to build machines with appropriate temporal properties. Computationalists conclude that a suitably supplemented version of CTM can adequately capture how cognition unfolds in time.