ⓘ Category mistake. A category mistake, or category error, or categorical mistake, or mistake of category, is a semantic or ontological error in which things belo ..


ⓘ Category mistake

A category mistake, or category error, or categorical mistake, or mistake of category, is a semantic or ontological error in which things belonging to a particular category are presented as if they belong to a different category, or, alternatively, a property is ascribed to a thing that could not possibly have that property. An example is the metaphor "time crawled", which if taken literally is not just false but a category mistake. To show that a category mistake has been committed one must typically show that once the phenomenon in question is properly understood, it becomes clear that the claim being made about it could not possibly be true.


1. Gilbert Ryle

The term "category-mistake" was introduced by Gilbert Ryle in his book The Concept of Mind 1949 to remove what he argued to be a confusion over the nature of mind born from Cartesian metaphysics. Ryle argued that it was a mistake to treat the mind as an object made of an immaterial substance because predications of substance are not meaningful for a collection of dispositions and capacities.

The phrase is introduced in the first chapter. The first example is of a visitor to Oxford. The visitor, upon viewing the colleges and library, reportedly inquired "But where is the University?" The visitors mistake is presuming that a University is part of the category "units of physical infrastructure" rather than that of an "institution". Ryles second example is of a child witnessing the march-past of a division of soldiers. After having had battalions, batteries, squadrons, etc. pointed out, the child asks when is the division going to appear. "The march-past was not a parade of battalions, batteries, squadrons and a division; it was a parade of the battalions, batteries and squadrons of a division." Ryles italics His third example is of a foreigner being shown a cricket match. After being pointed out batsmen, bowlers and fielders, the foreigner asks: "who is left to contribute the famous element of team-spirit?"

He goes on to argue that the Cartesian dualism of mind and body rests on a category mistake. In the philosophy of the mind, Ryles category mistake argument can be used to support eliminative materialism. By using the argument, one can attack the existence of a separate, distinct mind. The argument concludes that minds are not conscious, but a collective predicate for a set of observable behaviour and unobservable dispositions.

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