Tools and technologies expand our capacities, including our cognitive capacities. Microscopes extend our perceptual capacities. Notebooks extend the natural limits of memory. These facts are important, for all that they are obvious. The extended cognition hypothesis wants more. Some external devices and processes are literal parts of cognitive processes themselves. When there is fast and reliable access to external data or processes (and some other conditions are satisfied, perhaps), then the cognitive processes that occur uncontroversially inside the brain literally and controversially extend out into the world to incorporate external structures or processes. Retrieval of an address from memory and retrieval of the same information from a notebook can both be fully cognitive processes involving fully cognitive representations. So say the proponents of extended cognition.

It is...

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