1 Introduction
According to LeDoux [1], at the beginning of the 1960s, the artificial intelligence precursor Herbert Simon was convinced that including emotions in cognitive models was necessary to approximate the human mind. But only in recent years has the well-known emotional intelligence been taken into account as an essential factor to understand and evaluate human behavior. Moreover, some researchers have realized the importance of emotions in intelligent thinking and behaviors [2], [3], [4]. Several studies have shown that emotions have influence on many cognitive mechanisms, such as memory, attention, perception, and reasoning [5], [6]. Besides, emotions play a very important role in survival, social interaction, and learning of new behaviors [7].