Thank you!
Ah, and about the polygraph mechanic and polygraphs in general. The jitters are actually controlled by the player. I failed in communicating that if you press [space] when the heart's timer reaches [0] the jitters would be placated leading to a more "calm" reading. As such, any jitters would be a result of the player becoming unnerved and mistiming the [space] input. There are no actual branches in story as a result of the polygraph, which keeps players who interact with the mechanic and players who don't on relatively the same track.
Polygraphs are of course, easy to give a false reading. They only accept input and display the results putting responsibility for any actual analysis on the practitioner. If you have the time, try playing Polygraph again with this new information. It's quite a challenge to read the text while simultaneously keeping an eye on the timer!