Articulatory gestures
Encyclopedia
Articulatory gestures are the actions necessary to enunciate language. Examples of articulatory gestures are the hand movements necessary to enunciate sign language and the mouth movements of speech. In semiotic terms, they are the physical embodiment (signifiers) of speech signs, which are gestural by nature (see below).

The definition of gesture
Gesture
A gesture is a form of non-verbal communication in which visible bodily actions communicate particular messages, either in place of speech or together and in parallel with spoken words. Gestures include movement of the hands, face, or other parts of the body...

varies greatly, but here it will be taken in its widest sense, namely, any meaningful action. An intentional action is meaningful if it is not strictly utilitarian: for example, sending flowers to a friend is a gesture, because this action is performed not only for the purpose of moving flowers from one place to another, but also to express some sentiment or even a conventional message in the language of flowers
Language of flowers
The language of flowers, sometimes called floriography, was a Victorian-era means of communication in which various flowers and floral arrangements were used to send coded messages, allowing individuals to express feelings which otherwise could not be spoken...

. Use of the broadest definition of gesture (not restricted to hand movements) allows Hockett’s “rapid fading” design feature of human language
Design Features of Language
The Design Features of Language was a phrase coined in the 1960s by the American linguist Charles Hockett. Hockett believed that there existed 16 features of human language that distinguished human communication from that of animals. Charles Hockett also articulated that even the most basic human...

 to be accommodated as a type of sign in semiotic theory.

But if an articulatory gesture is to be considered a true gesture in the above sense, it must be meaningful. Therefore an articulatory gesture must be at least as large as the smallest meaningful unit of language, the morpheme. A morpheme corresponds roughly to a spoken word or a sign language gesture.

This definition differs from the practice, common among linguists, of referring to phonemes (meaningless mouth movements) as articulatory gestures (see articulatory phonology
Articulatory phonology
Articulatory phonology is a linguistic theory originally proposed in 1986 by Catherine Browman of Haskins Laboratories and Louis M. Goldstein of Yale University and Haskins...

). In semiotics
Semiotics
Semiotics, also called semiotic studies or semiology, is the study of signs and sign processes , indication, designation, likeness, analogy, metaphor, symbolism, signification, and communication...

, meaningless components of spoken gestures (written as individual letters), or meaningless components of sign language gestures (such as location of hand contact) are known as figurae
Figurae
Figurae are the non-signifying constituents of signifiers . For example, letters of the alphabet are the figurae that comprise a written word . In the semiotic language of Louis Hjelmslev, the coiner of this term, figurae serve only to distinguish elements of the expression plane from each...

, the constituents of signs.

It also differs from the tradition of considering speech sounds to be the signifiers of speech signs. But this practice confuses signals with symbols. Sound and light are analogue signals, whereas mouth and hand gestures are discrete symbolic entities. A sound or light signal is subject to random noise, whereas the image of the gesture is subject to regular distortion, as when a signer’s hand is viewed from different angles. In speech, the sound of the contact of the tongue in the letter T can be distorted by surrounding mouth movements, as in the phrase “perfect memory”. When pronounced at conversational speed, the sound of the tongue contact is completely obscured by surrounding consonants even though this T movement is fully carried out.

Articulatory gestures, when seen as the physical embodiment of speech and sign language symbols, provide a link between these two language types, and show how speech resembles sign language more closely than is generally presumed.
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