“…The fourth major category is less easy to define and there is considerable disagreement among researcher as to their origins and functions. What we will call lexical gestures are similar to what have been called "representational gestures" (McNeill, Cassell, & McCollough, 1994), "gesticulations" (Kendon, 1980;Kendon, 1983), "ideational gestures" (Hadar, Burstein, Krauss, & Soroker, 1998;Hadar & Butterworth, 1997) and "illustrators" (Ekman & Friesen, 1972). Like motor gestures, lexical gestures occur only as accompaniments to speech, but unlike motor gestures they vary considerably in length, are nonrepetitive, complex and changing in form, and many appear to bear a meaningful relation to the semantic content of the speech they accompany.…”