In the past, researches on patterns of line of sight have been done in order. One of the studies was Vertegaal et al. (2001) research aimed at verifying whether it is possible to predict with eyes whether the conversation partner is talking in the multiuser environment or whether it is listening. In a multiuser environment, the experimenter means to talk with three or more participants. In their presentation, Vertegaal et al. (2001) presented several different predictions about this study. In their initial hypothesis, they thought "individuals pay more attention to the time to listen or talk than others" (p. 302).
Goodwin (1981) described in detail the role of the gaze in rotation by considering the adjustment of the gaze of the listener and the gaze of participants. He insisted that the spokesperson's vision at the beginning of the story is to avoid overloading the information in planning the discourse. Although gaze behavior has been used to design a specific conversational agent, it does not happen at all opportunities. Wardhaugh (1971) argues that dialogue often includes many topics ranging from one topic to another, sometimes including mixtures of themes. In other words, in a conversation, speakers tend not only to talk about topics from beginning to end, but to transfer that topic to another topic. This can be considered a subtopic or a new topic of a previous topic. Wrong
The discourse function such as change of direction is mainly controlled by head movement and gaze. Since the recipient in the signing conversation must see the signer, the signer can avoid pointing the opponent by not seeing them, or that the opponent can turn around by eye contact Can be shown. The first study on ASL iconicity was published in the late 1970's and early 1980's. Many early sign language linguists refused the idea that iconicity is an important aspect of language. They recognize that certain aspects of the language seem to be symbolic, but they believe that this is only an attribute that does not affect super languages, languages. However, the imitation aspects of sign language (imitation, imitation, or representative sign language) can be found in various sign language.