‘Emotion’ can be defined as different mental and bodily changes with specific features. It is widely agreed that emotions have subjective, behavioral, cognitive and internal/peripheral physiological components. Cognitive processes are also associated with emotional responses. Emotions may vary from time to time or place to place either consciously or unconsciously. In his great philosophical path breaking work “On the Origin of species” (1859, 1872), Charles Darwin was one of the first who proposed that there are a limited number of basic and universal emotions. Ekman and Friesen (1971) have suggested that there are six basic emotions corresponding to anger, disgust, fear, happiness, sadness, and surprise. It is possible to conceptualize the emotion from several different perspectives:

• May be both conscious and unconscious
• Originates from different part of the brain
• Combines both mental and bodily changes
• Affects attention and procession of information in predictable way
• May influence motivation and behavior
• One type of “affective state” (Emotions, moods, sentiments and personality traits)