Facial muscle response doesn't imply feelings (Score 1)

After reading through the paper, I find the methods suspect. EMG of facial muscles are not always a reliable predictor of emotional response. They say they also perform skin conductivity tests, lets hope that the participants don't sweat a lot. I know that during most FPSs (Call of Duty 4 anyone?) people have a tendency to sweat more due to increased adrenaline and nervous system response. Also, I may have missed it, but I do not think they were playing against each other, just the AI. And, the participants were told they would get an extra movie ticket for being in the top 3, extra motivation to succeed, definitely can skew a study.