Abstract
Gesture categories and gesture units are characterized according to both formal and functional criteria. The resultant functional types fall along a continuum according to the degree to which their tokens have conventionalized symbolic status. The more conventional the form/meaning pairing, the more straightforward it is to identify gestures as units. Most types of gesture categories are best viewed as having prototype structures, rather than a category structure with strict boundaries. This view on gesture aligns with some contemporary thinking about linguistic categories, which also espouses a prototype approach. The result is a coherent picture of how gesture interactions with different categories and units of spoken language, taking human audio-visual communication as dynamic and polysemiotic in nature.
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