Audio expert Raymond Usher (Grand Theft Auto: Vice City, Crackdown) shares the results of a study in which players were monitored while playing three games with audio and without:
Reviewing group responses to all games it shows the audio group produced a high maximum heart rate and respiration rate for all games (heart rate Game 1: 84bpm, Game 2: 91bpm and Game 3: 90bpm; respiration rate Game 1: 25bpm, Game 2: 24 and Game 3: 27bpm). The no-audio group produced consistent maximum heart rate values over the three games (Game 1: 78bpm, Game 2: 77bpm and Game 3: 77bpm). The difference in heart rates between the groups shows the effect audio in games has on players.
It’s kind of a “duh” conclusion, but I’m interested in how they measured physical response rather than asking people to rationally explain things they don’t understand.