The most dominant and reliable features of facial expressions provide a constant channel of communication. They can be shifty and evasive; convey hate, fear, and guilt; or express confidence, love, and support.Referred to as "mirrors of the soul" our eyes serve as the major decisive factor in interpreting the spoken words. The eyes of the man converse as much as their tongues, with the advantage that the ocular dialect needs no dictionary, but it is understood all over the world. When the eyes say one thing, and the tongue another, a practiced man relies on eyes. Except for extremely shy individuals, most people look for social acceptance by studying the eyes of others. Eyes also can accurately indicate a positive or a negative relationship. People tend to look longer and more often at the people whom they trust, respect and care about than at those whom they doubt or dislike. Normal eye dilation is not under control of the individual. Personally characteristics such as introversion and extroversion also influence eye behavior. Eye behavior seems to be particular importance and is generally used to indicate whether one is open to communication. This can be observed when a teacher asks the class a question: students who think they know the answer will generally look at the teacher, while students who do not know the answer will usually try to avoid eye contact.
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