Noam Chomsky in the context of Institute for Advanced Study

Animal languages are forms of communication between non-human animals that show similarities to human language. Animals communicate through a variety of signs, such as sounds and movements. Signing among animals may be considered a form of language if the inventory of signs is large enough, the signs are relatively arbitrary, and the animals seem to produce them with a degree of volition (as opposed to relatively automatic conditioned behaviors or unconditioned instincts, usually including facial expressions).

The current academic consensus is that animal communication systems lack key aspects that might define them as languages (or equivalent to human languages), one such aspect being humans' creation of new patterns of signs under varied circumstances. Humans routinely produce entirely new combinations of words. Some researchers, including the linguist Charles Hockett, argue that human language and animal communication differ so much that the underlying principles are unrelated. Accordingly, linguist Thomas A. Sebeok has proposed to not use the term "language" for animal sign systems. However, other linguists and biologists, including Marc Hauser, Noam Chomsky, and W. Tecumseh Fitch, assert that an evolutionary continuum exists between the communication methods of animal and human language.

Polemic (/pəˈlɛmɪk/ pə-LEHM-ick, US also /-ˈlimɪk/ -⁠LEEM-ick) is contentious rhetoric intended to support a specific position by forthright claims and to undermine the opposing position. The practice of such argumentation is called polemics, which are seen in arguments on controversial topics. A person who writes polemics, or speaks polemically, is called a polemicist. The word derives from Ancient Greek πολεμικός (polemikos) 'warlike, hostile', from πόλεμος (polemos) 'war'.

Polemics often concern questions in religion or politics. A polemical style of writing was common in Ancient Greece, as in the writings of the historian Polybius. Polemic again became common in medieval and early modern times. Since then, famous polemicists have included satirist Jonathan Swift, Italian physicist and mathematician Galileo, French theologian Jean Calvin, French Enlightenment writer, historian, and philosopher Voltaire, Russian author Leo Tolstoy, socialist philosophers Karl Marx and Friedrich Engels, novelist George Orwell, playwright George Bernard Shaw, communist revolutionary Vladimir Lenin, linguist Noam Chomsky, social critics H. L. Mencken, Christopher Hitchens and Peter Hitchens, and existential philosophers Søren Kierkegaard and Friedrich Nietzsche.

Biolinguistics can be defined as the biological and evolutionary study of language. It is highly interdisciplinary as it draws from various fields such as sociobiology, linguistics, psychology, anthropology, mathematics, and neurolinguistics to elucidate the formation of language. It seeks to yield a framework by which one can understand the fundamentals of the faculty of language. This field was first introduced by Massimo Piattelli-Palmarini, professor of Linguistics and Cognitive Science at the University of Arizona. It was first introduced in 1971, at an international meeting at the Massachusetts Institute of Technology (MIT).

Biolinguistics, also called the biolinguistic enterprise or the biolinguistic approach, is believed to have its origins in Noam Chomsky's and Eric Lenneberg's work on language acquisition that began in the 1950s as a reaction to the then-dominant behaviorist paradigm. Fundamentally, biolinguistics challenges the view of human language acquisition as a behavior based on stimulus-response interactions and associations. Chomsky and Lenneberg militated against it by arguing for the innate knowledge of language. Chomsky in 1960s proposed the Language Acquisition Device (LAD) as a hypothetical tool for language acquisition that only humans are born with. Similarly, Lenneberg (1967) formulated the Critical Period Hypothesis, the main idea of which being that language acquisition is biologically constrained. These works were regarded as pioneers in the shaping of biolinguistic thought, in what was the beginning of a change in paradigm in the study of language.

Universal grammar (UG), in modern linguistics, is the theory of the innate biological component of the language faculty, usually credited to Noam Chomsky. The basic postulate of UG is that there are innate constraints on what the grammar of a possible human language could be. When linguistic stimuli are received in the course of language acquisition, children then adopt specific syntactic rules that conform to UG. The advocates of this theory emphasize and partially rely on the poverty of the stimulus (POS) argument and the existence of some universal properties of natural human languages. However, the latter has not been firmly established.

Other linguists have opposed that notion, arguing that languages are so diverse that the postulated universality is rare. The theory of universal grammar remains a subject of debate among linguists.

Conceptual semantics is a framework for semantic analysis developed mainly by Ray Jackendoff in 1976. Its aim is to provide a characterization of the conceptual elements by which a person understands words and sentences, and thus to provide an explanatory semantic representation (title of a Jackendoff 1976 paper). Explanatory in this sense refers to the ability of a given linguistic theory to describe how a component of language is acquired by a child (as proposed by Noam Chomsky; see Levels of adequacy).

Recently, conceptual semantics in particular, and lexical semantics in general, have taken on increasing importance in linguistics and psycholinguistics. Many contemporary theories of syntax (how sentences are constructed from individual words) rely on elements that are idiosyncratic to words themselves. As a result, a sound theory accounting for the properties of the meanings of words is required.

Generative grammar is a research tradition in linguistics that aims to explain the cognitive basis of language by formulating and testing explicit models of humans' subconscious grammatical knowledge. Generative linguists tend to share certain working assumptions such as the competence–performance distinction and the notion that some domain-specific aspects of grammar are partly innate in humans. These assumptions are often rejected in non-generative approaches such as usage-based models of language. Generative linguistics includes work in core areas such as syntax, semantics, phonology, psycholinguistics, and language acquisition, with additional extensions to topics including biolinguistics and music cognition.

Generative grammar began in the late 1950s with the work of Noam Chomsky, having roots in earlier approaches such as structural linguistics. The earliest version of Chomsky's model was called Transformational grammar, with subsequent iterations known as Government and binding theory and the Minimalist program. Other present-day generative models include Optimality theory, Categorial grammar, and Tree-adjoining grammar.

Colorless green ideas sleep furiously was composed by Noam Chomsky in his 1957 book Syntactic Structures as an example of a sentence that is grammatically well-formed, but semantically nonsensical. The sentence was originally used in his 1955 thesis The Logical Structure of Linguistic Theory and in his 1956 paper "Three Models for the Description of Language". There is no obvious understandable meaning that can be derived from it, which demonstrates the distinction between syntax and semantics, and the idea that a syntactically well-formed sentence is not guaranteed to also be semantically well-formed. As an example of a category mistake, it was intended to show the inadequacy of certain probabilistic models of grammar, and the need for more structured models.

Anti-Americanism (also called anti-American sentiment and Americanophobia) is a term that can describe several sentiments and positions including opposition to, fear of, distrust of, prejudice against or hatred toward the United States, its government, its foreign policy, or Americans in general. Anti-Americanism can be contrasted with pro-Americanism, which refers to support, love, or admiration for the United States.

Political scientist Brendon O'Connor at the United States Studies Centre in Australia suggests that "anti-Americanism" cannot be isolated as a consistent phenomenon, since the term originated as a rough composite of stereotypes, prejudices, and criticisms which evolved into more politically-based criticisms. French scholar Marie-France Toinet says that use of the term "anti-Americanism" is "only fully justified if it implies systematic opposition – a sort of allergic reaction – to America as a whole." Some scholars frequently accused of anti-American biases, such as Noam Chomsky and Nancy Snow, have argued that the application of the term "anti-American" to other countries or their populations is 'nonsensical', as it implies that disliking the American government or its policies is socially undesirable or even comparable to a crime. In this regard, the term has been likened to the propagandistic usage of the term "anti-Sovietism" in the USSR.

The Language Acquisition Device (LAD) is a claim from language acquisition research proposed by Noam Chomsky in the 1960s. The LAD concept is a purported instinctive mental capacity which enables an infant to acquire and produce language. It is a component of the nativist theory of language. This theory asserts that humans are born with the instinct or "innate facility" for acquiring language. The main argument given in favor of the LAD was the argument from the poverty of the stimulus, which argues that unless children have significant innate knowledge of grammar, they would not be able to learn language as quickly as they do, given that they never have access to negative evidence and rarely receive direct instruction in their first language.

Critics say there is insufficient evidence from neuroscience and language acquisition research to support the claim that people have a language acquisition device.

The language module or language faculty is a hypothetical structure in the human brain which is thought to contain innate capacities for language, originally posited by Noam Chomsky. There is ongoing research into brain modularity in the fields of cognitive science and neuroscience, although the current idea is much weaker than what was proposed by Chomsky and Jerry Fodor in the 1980s. In today's terminology, 'modularity' refers to specialisation: language processing is specialised in the brain to the extent that it occurs partially in different areas than other types of information processing such as visual input. The current view is, then, that language is neither compartmentalised nor based on general principles of processing (as proposed by George Lakoff). It is modular to the extent that it constitutes a specific cognitive skill or area in cognition.

Phrase structure rules are a type of rewrite rule used to describe a given language's syntax and are closely associated with the early stages of transformational grammar, proposed by Noam Chomsky in 1957. They are used to break down a natural language sentence into its constituent parts, also known as syntactic categories, including both lexical categories (parts of speech) and phrasal categories. A grammar that uses phrase structure rules is a type of phrase structure grammar. Phrase structure rules as they are commonly employed operate according to the constituency relation, and a grammar that employs phrase structure rules is therefore a constituency grammar; as such, it stands in contrast to dependency grammars, which are based on the dependency relation.

In linguistics, the poverty of the stimulus is the claim that children are not exposed to rich enough data within their linguistic environments to acquire every feature of their language without innate language-specific cognitive biases. Arguments from the poverty of the stimulus are used as evidence for universal grammar, the notion that at least some aspects of linguistic competence are innate. The term "poverty of the stimulus" was coined by Noam Chomsky in Rules and Representations, 1980. A variety of linguistic phenomena have been used to argue for universal grammar on the basis that children do not have sufficient evidence to acquire the phenomena using general (i.e., non-language-specific) cognition alone. Critics of the universal grammar hypothesis have proposed alternative models that suggest acquisition of these phenomena may be less difficult than has been previously claimed. The empirical and conceptual bases of poverty of the stimulus arguments are a topic of continuing debate in linguistics.

The cognitive revolution was an intellectual movement that began in the 1950s as an interdisciplinary study of the mind and its processes, from which emerged a new field known as cognitive science. The preexisting relevant fields were psychology, linguistics, computer science, anthropology, neuroscience, and philosophy. The approaches used were developed within the then-nascent fields of artificial intelligence, computer science, and neuroscience. In the 1960s, the Harvard Center for Cognitive Studies and the Center for Human Information Processing at the University of California, San Diego were influential in developing the academic study of cognitive science. By the early 1970s, the cognitive movement had surpassed behaviorism as a psychological paradigm. Furthermore, by the early 1980s the cognitive approach had become the dominant line of research inquiry across most branches in the field of psychology.

A key goal of early cognitive psychology was to apply the scientific method to the study of human cognition. Some of the main ideas and developments from the cognitive revolution were the use of the scientific method in cognitive science research, the necessity of mental systems to process sensory input, the innateness of these systems, and the modularity of the mind. Important publications in triggering the cognitive revolution include psychologist George Miller's 1956 article "The Magical Number Seven, Plus or Minus Two" (one of the most frequently cited papers in psychology), linguist Noam Chomsky's Syntactic Structures (1957) and "Review of B. F. Skinner's Verbal Behavior" (1959), Plans and the Structure of Behavior by George Armitage Miller, Eugene Galanter, and Karl Pribram (1960), and foundational works in the field of artificial intelligence by John McCarthy, Marvin Minsky, Allen Newell, and Herbert Simon, such as the 1958 article "Elements of a Theory of Human Problem Solving". Ulric Neisser's 1967 book Cognitive Psychology was also a landmark contribution.

Roman Osipovich Jakobson (Russian: Рома́н О́сипович Якобсо́н, IPA: [rɐˈman ˈosʲɪpəvʲɪt͡ɕ (j)ɪkɐpˈson]; 11 October [O.S. 29 September] 1896 – 18 July 1982) was a Russian linguist and literary theorist. A pioneer of structural linguistics, Jakobson was one of the most celebrated and influential linguists of the twentieth century. With Nikolai Trubetzkoy, he developed revolutionary new techniques for the analysis of linguistic sound systems, in effect founding the modern discipline of phonology. Jakobson went on to extend similar principles and techniques to the study of other aspects of language such as syntax, morphology and semantics. He made numerous contributions to Slavic linguistics, most notably two studies of Russian case and an analysis of the categories of the Russian verb. Drawing on insights from C. S. Peirce's semiotics, as well as from communication theory and cybernetics, he proposed methods for the investigation of poetry, music, and the visual arts including cinema.

Through his decisive influence on Claude Lévi-Strauss and Roland Barthes, among others, Jakobson became a pivotal figure in the adaptation of structural analysis to disciplines beyond linguistics, including philosophy, anthropology and literary theory; his development of the approach pioneered by Ferdinand de Saussure, known as "structuralism", became a major post-war intellectual movement in Europe and the United States. Meanwhile, though the influence of structuralism declined during the 1970s, Jakobson's work has continued to receive attention in linguistic anthropology, especially through the ethnography of communication developed by Dell Hymes and the semiotics of culture developed by Jakobson's former student Michael Silverstein. Jakobson's concept of underlying linguistic universals, particularly his celebrated theory of distinctive features, decisively influenced the early thinking of Noam Chomsky, who became the dominant figure in theoretical linguistics during the second half of the twentieth century.

Leonard Bloomfield (April 1, 1887 – April 18, 1949) was an American linguist who led the development of structural linguistics in the United States during the 1930s and the 1940s. He is considered to be the father of American distributionalism. His influential textbook Language, published in 1933, presented a comprehensive description of American structural linguistics. He made significant contributions to Indo-European historical linguistics, the description of Austronesian languages, and description of languages of the Algonquian family.

Bloomfield's approach to linguistics was characterized by its emphasis on the scientific basis of linguistics and emphasis on formal procedures for the analysis of linguistic data. The influence of Bloomfieldian structural linguistics declined in the late 1950s and 1960s as the theory of generative grammar developed by Noam Chomsky came to predominate.

In his work Aspects of the Theory of Syntax (1965), Noam Chomsky introduces a hierarchy of levels of adequacy for evaluating grammars (theories of specific languages) and metagrammars (theories of grammars).

These levels constitute a taxonomy of theories (a grammar of a natural language being an example of such a theory) according to validation. This taxonomy might be extended to scientific theories in general, and from there even stretched into the field of the aesthetics of art. This present article's use of the phrase as a terminus technicus should not be confused with its everyday language uses.

In linguistics, X-bar theory is a model of phrase structure and a theory of syntactic category formation that proposes a universal schema for how phrases are organized. It suggests that all phrases share a common underlying structure, regardless of their specific category (noun phrase, verb phrase, etc.). This structure, known as the X-bar schema, is based on the idea that every phrase (XP, X phrase) has a head, which determines the type (syntactic category) of the phrase (X).

The theory was first proposed by Noam Chomsky in 1970 reformulating the ideas of Zellig Harris (1951), and further developed by Ray Jackendoff (1974, 1977a, 1977b), along the lines of the theory of generative grammar put forth in the 1950s by Chomsky. It aimed to simplify and generalize the rules of grammar, addressing limitations of earlier phrase structure models. X-bar theory was an important step forward because it simplified the description of sentence structure. Earlier approaches needed many phrase structure rules, which went against the idea of a simple, underlying system for language. X-bar theory offered a more elegant and economical solution, aligned with the thesis of generative grammar.