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Applications of Body Language
Fundamentally, body language is seemed as an involuntary and unconscious phenomena that adds to the process of communication. Despite that, there have been certain areas where the conscious harnessing of body language - both in action and comprehension - have been useful. The use of body language has also seen an increase in application and use commercially, with large volumes of books and guides published designed to teach people how to be conscious of body language, and how to use it to benefit them in certain scenarios.

The use of body language can be seen in a wide variety of fields. Body language has seen application in instructional teaching in areas such as second language acquisition and also to enhance the teaching of subjects like mathematics. A related use of body language is as a substitution to verbal language to people who lack the ability to use that, be it because of deafness or aphasia. Body language has also been applied in the process of detecting deceit through micro-expressions, both in law enforcement and even in the world of poker.

Second Language Acquisition
The importance of body language in second language acquisition was inspired by the fact that to successfully learn a language is to achieve discourse, strategic, and sociolinguistic competencies. Sociolinguistic competence includes understanding the body language that aids the use of a particular language. This is usually also highly culturally influenced. As such, a conscious ability to recognize and even perform this sort of body language is necessary to achieve fluency in a language beyond the discourse level.

The importance of body language to verbal language use is the need to eliminate ambiguity and redundancy in comprehension. Pennycook (1985) suggests to limit the use of non-visual materials to facilitate the teaching of a second language to improve this aspect of communication. He calls this being not just bilingual but also 'bi-kinesic'.

Enhancing Teaching
Body language can be a useful aid not only in teaching a second language, but also in other areas. The idea behind using it is as a nonlinguistic input. It can be used to guide, hint, or urge a student towards the right answer. This is usually paired off with other verbal methods of guiding the student, be it through confirmation checks or modified language use. Tai in his 2014 paper provides a list of three main characteristic of body language and how they influence teaching. The features are intuition, communication, and suggestion.

The intuitive feature of body language used in teaching is the exemplification of the language, especially individual words, through the use of matching body language. For example, when teaching about the word "cry", teachers can imitate a crying person. This enables a deeper impression which is able to lead to greater understanding of the particular word.

The communicative feature is the ability of body language to create an environment and atmosphere that is able to facilitate effective learning. A holistic environment is more productive for learning and the acquisition for new knowledge.

The suggestive feature of body language uses body language as a tool to create opportunities for the students to gain additional information about a particular concept or word through pairing it with the body language itself.

Law Enforcement
Body language has seen use in the area of law enforcement. The relevance of body language in this area can be seen in the numerous Federal Bureau of Investigation (FBI) Law Enforcement Bulletin that have included it in their articles. The application of body language in law enforcement goes both ways. Members of law enforcement can use body language to catch unspoken cues by suspects or even victims, this enables a more calculated and more comprehensive judgement of people. The other side of body language is that of the investigators' themselves. The body language of the members of law enforcement might influence the accuracy of eyewitness accounts.

Poker
The game of poker does not consist only of the actual ability of playing the game, but also the competence of reading and analyzing the body language of the opponents. A key component of poker is to be able to "cheat" the opponents. To spot these cheats, players must have the ability to spot the individual "ticks" of their opponents. Players also have to look out for signs that an opponent is doing well.