Invariance principle  

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In cognitive linguistics, the invariance principle is a simple attempt to explain similarities and differences between how an idea is understood in "ordinary" usage, and how it is understood when used as a conceptual metaphor.

Kövecses (2002: 102) provides the following examples based on the semantics of the English verb to give.

She gave him a book. (source language)

Based on the metaphor CAUSATION IS TRANSFER we get:

(a) She gave him a kiss.
(b) She gave him a headache.

However, the metaphor does not work in exactly the same way in each case, as seen in:

(b') She gave him a headache, and he still has it.
(a') *She gave him a kiss, and he still has it.

The invariance principle offers the hypothesis that metaphor only maps components of meaning from the source language that remain coherent in the target context. The components of meaning that remain coherent in the target context retain their "basic structure" in some sense, so this is a form of invariance.

George Lakoff and Mark Turner originated the idea under the name invariance hypothesis, later revising and renaming it as the invariance principle. Lakoff (1993: 215) gives the invariance principle as: "Metaphorical mappings preserve the cognitive topology (that is, the image-schema structure) of the source domain, in a way consistent with the inherent structure of the target domain".

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Unless indicated otherwise, the text in this article is either based on Wikipedia article "Invariance principle" or another language Wikipedia page thereof used under the terms of the GNU Free Documentation License; or on original research by Jahsonic and friends. See Art and Popular Culture's copyright notice.

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