Perceptual indiscriminability: In defence of Wright's proof

Philosophical Quarterly 54 (216):439-444 (2004)
A series of unnoticeably small changes in an observable property may add up to a noticeable change. Crispin Wright has used this fact to prove that perceptual indiscriminability is a non-transitive relation. Delia Graff has recently argued that there is a 'tension' between Wright's assumptions. But Graff has misunderstood one of these, that 'phenomenal continua' are possible; and the other, that our powers of discrimination are finite, is sound. If the first assumption is properly understood, it is not in tension with but is actually implied by the second, given a plausible physical assumption.
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DOI 10.1111/j.0031-8094.2004.00364.x
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Philippe Chuard (2010). Non-Transitive Looks & Fallibilism. Philosophical Studies 149 (2):161 - 200.
Dalia Drai (2007). The Phenomenal Sorites and Response Dependence. Australasian Journal of Philosophy 85 (4):619 – 631.

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