Verbal Behavior

Skinner argues that verbal behavior—speaking, writing, gesturing, thinking—is operant behavior subject to the same functional analysis as any other behavior, and that it differs from nonverbal behavior only because it operates indirectly on the environment through the mediation of a verbal community. The book rejects the assumption that language requires a special mental faculty or innate grammatical structures. It also rejects traditional linguistic categories like meaning, reference, and ideas as explanatory fictions that halt inquiry rather than advance it. Skinner's method is to identify the controlling variables—stimuli, reinforcement, deprivation—that determine each verbal response, and to classify operants by their functional relations rather than by their form .

Skinner proposes a functional taxonomy of verbal operants distinguished by their controlling variables and consequences. The mand is a verbal response under the control of deprivation or aversive stimulation and reinforced by a specific consequence—it is a request or command. The tact is under the control of a nonverbal stimulus and reinforced by generalized social reinforcement—it names or describes something. The echoic is under the control of verbal stimuli and produces a matching response. The intraverbal is under the control of verbal stimuli but does not match them—it includes sequences like reciting a poem or answering a question. The autoclitic is a higher-order operant that modifies or comments on other verbal behavior, affecting the listener's response to the speaker's utterance .

Chomsky's 1959 review in Language argued that Skinner's functional analysis was inadequate to account for the productivity and creativity of language—the capacity to produce and understand novel sentences. Chomsky contended that reinforcement and stimulus control cannot explain how children acquire grammar with such speed and on the basis of impoverished input. The review is widely credited with discrediting behaviorist approaches to language in linguistics and psychology. Julie Tetel Andresen describes it as causing a theoretical trauma from which linguistics has still not recovered, and notes that Chomsky succeeded not only in creating the impression he had dismantled Skinner's account but also in demonizing the man and his lifework in the linguistic community .

Skinner argues that traditional linguistics and semantics have failed to develop techniques for causal analysis and have not produced a unified system . He rejects the practice of explaining verbal behavior by reference to ideas, meanings, or mental images, which he treats as explanatory fictions—entities whose only evidence is the behavior they are said to cause. Where linguistics classifies words by grammatical category or semantic content, Skinner classifies verbal operants by their controlling variables and consequences. His approach is pragmatic and functional: understanding verbal behavior means denoting the contingencies that control what people say or write, not decoding an inner language of thought .

The autoclitic is Skinner's most distinctive and complex operant, described as behavior that is 'based upon or depends upon other verbal behavior.' It modifies the effect of other verbal responses on the listener, often by indicating the speaker's confidence, the source of information, or the logical relations between statements. For example, phrases like 'I think,' 'It is certain that,' or 'Therefore' function autoclitically to qualify the listener's response to the main utterance . Skinner argues that autoclitic behavior explains how verbal behavior becomes self-editing, logical, and scientific, and that the ultimate explanation of autoclitic behavior lies in its effect on the listener, including the speaker as listener of their own verbal behavior .

Skinner called Verbal Behavior his most important book and worked on it for over twenty years, beginning after a 1934 dinner conversation with Alfred North Whitehead . The book extends the laboratory-based principles of The Behavior of Organisms to the domain of language, applying the operant framework to speaking, writing, gesturing, and thinking. The initial reception was mixed; some in the behavioral community embraced it enthusiastically, with Jack Michael beginning to teach from it at the University of Kansas even before publication . However, the book did not have the immediate and widespread positive impact Skinner hoped for, and Chomsky's review further diminished its influence in mainstream linguistics .