Another major issues is how to model human emotions. Because of lack of good mathematical models, human emotions were not modelled earlier. But in recent years, the research focuses on development of emotion engines. Based on a matrix containing transition probability, human emotions are represented in the computer. The human emotions can be modelled as a finite state machine, each state representing an emotion. When a stimulus is given as input to one state, the machine moves to another state (another emotion). A finite state machine can be converted into a software program and hence, we can easily model human emotions.

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