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 gestos / mãos

Although the study of gesture is still in its infancy, some broad categories of gestures have been identified by researchers. The most familiar are the so-called emblems or quotable gestures. These are conventional, culture-specific gestures that can be used as replacement for words, such as the handwave used in the US for "hello" and "goodbye". A single emblematic gesture can a have very different significance in different cultural contexts, ranging from complimentary to highly offensive. Another broad category of gestures comprises those gestures used spontaneously when we speak. These gestures are closely coordinated with speech. The so-called beat gestures are used in conjunction with speech and keep time with the rhythm of speech to emphasize certain words or phrases. These types of gestures are integrally connected to speech and thought processes. Other spontaneous gestures used when we speak are more contentful and may echo or elaborate the meaning of the co-occurring speech. For example, a gesture that depicts the act of throwing may be synchronous with the utterance, "He threw the ball right into the window."

Gestural languages such as American Sign Language and its regional siblings operate as complete natural languages that are gestural in modality. They should not be confused with finger spelling, in which a set of emblematic gestures are used to represent a written alphabet.

Gestures are processed in the same areas of the brain as speech and sign language such as the left inferior frontal gyrus (Broca's area) and the posterior middle temporal gyrus, posterior superior temporal sulcus and superior temporal gyrus (Wernicke's area). It has been suggested that these parts of the brain originally supporting the pairing of gesture and meaning and then were adapted in human evolution "for the comparable pairing of sound and meaning as voluntary control over the vocal apparatus was established and spoken language evolved".As a result, it underlies both symbolic gesture and spoken language in the present human brain. Their common neurological basis also supports the idea that symbolic gesture and spoken language are two parts of a single fundamental semiotic system that underlies human discourse.

Fingerspelling 

is the representation of the letters of a writing system, and sometimes numeral systems, using only the hands. These manual alphabets (also known as finger alphabets or hand alphabets), have often been used in deaf education, and have subsequently been adopted as a distinct part of a number of sign languages around the world. Historically, manual alphabets have had a number of additional applications — including use as ciphers, as mnemonics, and in silent religious settings.

 

Chironomia 

is the art of using gesticulations or hand gestures to good effect in traditional rhetoric or oratory. Effective use of the hands, with or without the use of the voice, is a practice of great antiquity, which was developed and systematized by the Greeks and the Romans. Various gestures had conventionalized meanings which were commonly understood, either within certain class or professional groups, or broadly among dramatic and oratorical audiences.

Gilbert Austin was a well-known author on chironomia. The article about him contains a summary of theories in chironomia.

• John Bulwer, Chirologia ; Or the Natural Language of the Hand. Chironomia or the Art of Manual Rhetoric (1644). (Landmarks in rhetoric and public address).
• Gilbert Austin, Chironomia, or a Treatise on Rhetorical Delivery (1806). Ed. Mary Margaret Robb and Lester Thonssen. Carbondale, IL: Southern Illinois UP, 1966.