Abstract

Shapiro has argued that the multiple realizability thesis for psychology, despite its broad acceptance, is far from being a well-established thesis. He suggests that not only do many of the standard examples of multiple realizability fail to be clearly examples but a competing thesis (“the mental constraint thesis”) that human-like minds are severely constrained in their physical realization is the more likely thesis. I will argue, however, that Shapiro’s mental constraint thesis is not a competing thesis with the multiple realizability thesis. Once it is understood how these theses are compatible, the widespread acceptance of multiple realizability looks entirely reasonable.