Burge answers Descartes, and it takes him 688 pages

There are philosophers whose influence inside the discipline is enormous and whose names mean little outside it. Tyler Burge heads that list.

Flint Professor of Philosophy at UCLA, Burge changed the agenda of the philosophy of mind with a single paper published in 1979. In August he brought out a new book of 688 pages on the same family of problems: Answering Scepticism: Understanding Understanding, Understanding Reason (Oxford University Press, 21 August 2026).

First, 1979: are thoughts inside the head?#

Burge's name goes with one thesis: anti-individualism, or, in its commoner name, externalism.

It runs like this. The content of a person's thoughts is not fixed by the states inside that person's head alone. The environment — the physical environment, and the linguistic community — enters constitutively into the determination of content.

Burge's famous thought experiment shows what this means.

A man's arm hurts, and he tells his doctor that his arthritis has spread to his arm. The doctor corrects him: arthritis affects the joints only; it does not spread to muscle. The man is mistaken — but he is mistaken about arthritis.

Now imagine the very same man, in exactly the same bodily states, in a linguistic community where the word “arthritis” is used to cover both joints and muscles. When that man utters the same sentence he is not mistaken — and what he is thinking about is no longer arthritis but a different concept.

The insides of the two men's heads are identical. Their thoughts are not.

The conclusion: mental content cannot be exhausted by facts internal to the individual. To have a thought requires belonging to a community.

The thesis is usually mentioned alongside Hilary Putnam's Twin Earth argument, but Burge's version is broader. Putnam's was confined to natural kinds; Burge's applies to every concept — legal, mathematical, everyday.

Its effect has lasted. Most of the debates now conducted under the headings of the “extended mind”, “social epistemology” and “conceptual engineering” are children of that thesis.

Then perception#

Burge's second great project took shape in Origins of Objectivity, published in 2010, and in Perception: First Form of Mind, published in 2022.

The question there is: where does mind begin?

Burge's answer is unexpected. Not in language, and not in concepts either — in perception. An organism's capacity to represent the objects around it as objects is the first form of mind. And it is pre-linguistic: infants have it, and so do many animals.

The consequence connects directly with the debate over animal consciousness we covered this week. If objectivity does not depend on language, the domain of mental life is far wider than we assume.

And now: scepticism#

The new book answers two distinct classical scepticisms, both of which have run since Descartes.

The first scepticism: do we really know that the external world exists?

The second scepticism: do we know anything at all about what is going on around us at this moment?

The distinction is fine, but it matters. The first is ontological: is there a world out there? The second is concrete: even if there is, do I know that this table is here now?

Burge's two arguments are built respectively on understanding and on reason.

Hence the repetition in the subtitle: Understanding Understanding, Understanding Reason — an account of what it is to understand, and then of what it is to reason.

The strategy is the natural continuation of anti-individualism. If having a thought already requires a relation to the environment, then the supposition that “perhaps there is no external world, but my thoughts would be just the same” is incoherent from the start. In order to formulate his doubt, the sceptic has to presuppose the very thing he doubts.

This is one of the strongest forms an answer to Descartes can take: not refuting the sceptic, but exhibiting the conditions under which the doubt can be framed at all.

The book's reach is not confined to one field. According to the publisher's description it contributes to epistemology and meta-epistemology, and beyond them to the philosophy of mind, metaphysics, the philosophy of perception, the philosophy of mathematics and logic, the theory of reasoning, the philosophy of language, the philosophy of action and the history of philosophy.

Who is it written for?#

Let us be plain: this is not a popular book.

688 pages, dense argument, technical vocabulary. It is the sort of text philosophers read because philosophers wrote it for them.

That does not make it unimportant — quite the reverse. Michael Pollan's book on consciousness, which we covered this week, and Burge's book display two different functions of a single discipline.

Pollan translates a philosophical problem into public language. Burge lays the technical ground beneath the problem.

Both are necessary. But the order matters: the public translation is worth having only so long as there is technical ground behind it.

Seen from Turkey#

Burge has next to no presence in Turkish. Individualism and the Mental has not been translated, and neither have Origins of Objectivity or Perception.

That is a gap, because his thesis bears directly on philosophical argument in Turkey.

Recall our file on Arda Denkel from this week. Denkel studied at Oxford under P. F. Strawson and took his doctorate in the philosophy of language, on the natural ground of meaning. Burge's anti-individualism is precisely the next generation of the problem area in which Denkel worked.

And for a philosophical tradition in which awareness of language is central — think of Aruoba's project of writing philosophy in Turkish — Burge's thesis carries a direct claim:

To think in a language is to belong to the community of that language. The content of a thought depends on how that community uses its concepts.

If that is right, the phrase “doing philosophy in Turkish” describes not a preference of style but a fact about the content of the thought.

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Details: Tyler Burge · Answering Scepticism: Understanding Understanding, Understanding Reason · Oxford University Press · 21 August 2026 · 688 pages · English · ISBN 9780198969334

Note: no Turkish translation has yet been announced.