  (c) Physicalist theories of thought almost all focus on the model of computing, and when it comes to making problem solving (as opposed to simply calculating) computers, computation comes across what is known as the Frame Problem. This is clearly expounded in Dennett (1984); see also the entry on  the frame problem.  The problem is that the ‘mechanical mind’ can only follow instructions, cannot see relevance that has not been strictly encoded.This is often expressed by saying it lacks ‘common sense’.