Gamasutra is running an article written by Tim Hong of EmSense in which he describes the research his company did into the physiological reactions various games engender in players
. In addition to outward cues like breathing and movement, EmSense also scans brainwaves and heart activity to provide a more complete picture of how a gamer is responding to what he sees and does. They collected hundreds of hours worth of data and made comparisons among a variety of shooters, such as Gears of War 2
, and Half-Life 2
. They found some interesting information on how pacing, tutorials, and cutscenes can affect a player's level of engagement with the games.