Cléirigh's Three Types Of Body Language

The model distinguishes three broad types of body language: protolinguistic, linguistic and epilinguistic. 

1. Protolinguistic body language is the use of the body to express the meanings of protolanguage; this does not cease with the ontogenetic move into language.
2. Linguistic body language is the supplementary use of the body to make the meanings of language, as the raising of eyebrows in tune with the raising of tonic pitch, or the beating of hands in time with the rhythm of speech.
3. Epilinguistic body language is the (non-linguistic) use of the body to express the meanings made possible by language, the analogue of pictorial semiotic systems.

Linguistic body language is the only type that is tri-stratal; protolinguistic and epilinguistic body language are bi-stratal (no grammar, just content and expression), since only language has a stratified content plane.