Emotional evaluation parameters are mainly distinguished by using the mechanism of the nervous system rather than evokedness (Valence) and alertness (Arousal). From these two parameters, the direction of positive vs. negative and its intensity are judged.
From this judgment, fear, pleasure, sadness, and comfort are derived, and the types of emotions are distinguished. The emotions created in this way eventually encourage the development of the mind. Subjective evaluation of emotions is generally judged by three factors: evokedness, alertness, and dominance, but the dominant factor is excluded for the sake of simplicity.