No details were offered on how the device could be used for software. However, Iwata said that it could be a tool to help people relax and lower their heart rate. Nintendo offered no further details about the project, and it remains unclear what, if any, future plans they have for the Vitality Sensor.
An idea would be if the player were in a horror survival game, and the game read how scared the player was, or something.
I uuhh don't care about this thing. You could only really hold one wiimote while using it.
The Japan-only Tetris 64 used a piece of tech similar to this which would cause the game to get easier if your heart rate increased, and it would get more difficult if it went down. There was also an option to swap that function. I wonder if this may be used similarly...
I've never played Eternal Darkness so I might be wrong, but wouldn't tying the sanity effects in an Eternal Darkness sequel to this be pretty cool?