Below is a photo of the rehearsal of "Dangerous" for This Is It. (click to enlarge)
Sort of reminds you of this image from the paramedic's report...
Note that ECG heart monitors use a similar green light:
It has been said that the background screen was to resemble brain waves, and below is a screen shot of an EEG, which measures such waves:
At minimum, it is interesting that an image of an aspect of the body being monitored is the backdrop for the "Dangerous" song.
And speaking of "Dangerous", did you know - Michael Jackson began recording the "Dangerous" album on June 25, 1990, almost 20 years ago. Bit o' trivia to start your week.
UPDATE: Here is the video of the whiteboard notes for the "Dangerous" rehearsal, which shows notes about brain waves (thank you Jessicakthx):