Visual adaptation and the purpose of perception

What is the purpose of perception? And how might the answer to this question help distinguish perception from other mental processes? Block’s landmark book, The Border between Seeing and Thinking, investigates the nature of perception, how perception differs from cognition, and why the distinction matters. It is, as one would expect, wide-ranging, deeply informed by relevant science, and hugely stimulating. Here, we explore a central project of the book — Block’s attempts to identify the features of perception that distinguish it from higher-level cognition — by focusing on his suggestion that such features closely relate to perception’s purpose. As well as offering detailed critical discussion of these proposals, our more general aim is to advertise both the promise and pitfalls of asking: What is perception for?

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