“…According to Spinola and Queiroz [34], another important issue related to the implementation of artificial emotions in robots is: How many and which emotions must be selected? In this work many different approaches are described, from authors that defended the idea of implementing a varying number of "basic" or "primary" emotions, from 4 to 22, [35] [36] [37], to others that decided to implement just one or two emotions [38], [39].…”