The Causal Topography of Cognition
Stevan R. Harnad · Journal of Cognitive Science · 2012
The causal structure of cognition can be simulated but not implemented computationally, just as the causal structure of a comet can be simulated but not implemented computationally. The only thing that allows us even to imagine otherwise is that cognition, unlike a comet, is invisible (to all but the cognizer).