Proper identification of emotional state can significantly improve quality of human-computer interfaces. Although computers are now a part of human life, the relation between human and machine is far from being natural. Understanding the emotional state enhances interaction. The ability to recognize the attitude and thoughts from one’s behaviour was the original system of communication prior to spoken language. Emotions are a medium of information regarding feelings of an individual and one’s expected feedback. The discrepancy between the words spoken and the interpretation of their actual content relies on nonverbal communication. During a conversation people are constantly sending and receiving different nonverbal clues, communicated through speech signal (paralanguage), body movements, facial expressions, and physiological changes.
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