13.4 MEASURING THE PLAYER ' S EMOTIONAL EXPERIENCE WITH BIOMETRICS 25 FIGURE 13.2 20 Microvolts 15 10 5 0 Negative events Corrugator Positive events Zygomaticus Mean Facial EMG by Juiced Race Events. shows these results by events and muscles. One can see that the negative and posi- tive events had a different pattern of emotions. The negative events results were