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'''Linguistic relativism''' refers to speculations about the varied influence of different languages upon thought. So-called "strong" forms of linguistic relativism are known as [[linguistic determinism]]: The [[Sapir-Whorf Hypothesis]] is the best known example, in so far as it proposes that perception and cognition is determined or constrained by characteristics that vary between languages. A "weak" interpretation supposes that linguistic differences may influence
"performance ", but do not limit "competence ".
Linguistic relativism is often contrasted with theories of [[universal grammar]] (UG), notably as elaborated by [[Noam Chomsky]]. UG emphasizes the role of evolution in developing a universal "mental grammar" as a capacity of the human species, which is said to serve as a foundation for all natural languages. The concept of universal grammar does not preclude the notion that language has a role in the formation of thought, but suggests that the common biological basis for the human capacity of language provides a "deep structure" that is a much stronger determinant than differences in the "surface structure" between languages .
[[Giambattista Vico]] is often credited with first raising the issue of linguistic relativism. In a 1709 lecture (''De nostri temporis studiorum ratione'', "On the method of study of our time"), he declared, "the ''ingenia'' ("wits") are formed by languages, rather than the languages by ''ingenia''". Vico's epistemology ("verum esse ipsum factum") supposed that representations created by the mind are the only objects of knowledge, and that different languages furnish diverse vocabularies of representational metaphors.
[[Wilhelm von Humboldt]] was a pioneering language scholar whose studies encompassed a broad selection of languages from different families around the world, notably including Basque, American, and Polynesian languages. He spent his last years studying the ancient Kawi language of Indonesia. In 1836, a year after his death, his theoretical views on language were published as "The Diversity of Human Language-Structure and its Influence on the intellectual and spiritual Development of Mankind" (''Über die Verschiedenheit des menschlichen Sprachbaus und seinen Einfluss auf die geistige Entwickelung des Menschengeschlechts''). For Humboldt, language was not merely an instrument for representing or communicating thought, but a "formative organ of thought" (''bildende Organ des Gedankens''): Different languages present "a diversity of world perspectives" (''Verschiedenheit der Weltansichten'').
Heymann Steinthal, a pupil of Humboldt, in the 1860s developed an interpretation of his mentor's notion of the "inner form" of a language. Intuition (''Anschauung'') underlying the forms of language arises unconsciously from a ''Volksgeist'', a Hegelian notion that served as a precursor to the anthropological sense of "culture". [[Franz Boas]], the founder of academic anthropology in the United States, was later to cite Steinthal as having demonstrated that "the form of thought is molded by the whole social environment of which language is part".
In 1875, [[William Dwight Whitney]], who studied under [[Franz Bopp]], published "The Life and Growth of Language: An Outline of Linguistic Science", in which he drew on Steinthal's treatment of Humboldt's notion of the "inner form" of a language to argue: "Every single language has thus its own peculiar framework of established distinctions, its shapes and forms of thought, into which, for the human being who learns that language as his ''mother-tongue'', is cast the content and product of his mind."
In 1916, Ferdinand de Saussure's ''Cours de linguistique générale'' ("Course in General Linguistics") is posthumously published, based on lectures given between 1906 and 1911, and laying the foundation for structural linguistics. "In itself," wrote Saussure, "thought is like a swirling cloud where no shape is intrinsically determined. No ideas are established in advance, and nothing is distinct, before the introduction of linguistic structure."