Here's a thing I never see anywhere, scanning is telepathy on energy. Read a construct like you'd read a mind.
I think its more accurate to liken active telepathy to scanning for "thoughts", rather then the other way around. Passive telepathy and empathy seem to be slightly different in most of my personal experiences, though, unless its just the same on a subconcious level.
Also, never over complicate it, no matter what anyone says. While the scientific theory behind it can be complex, the actual practice and experience of scanning is rediculously simple--most people only fail because they can't quiet they're mind enough to prevent Analytical Overlay, which is why meditation or some other form of mental training is often necessary to gain control over the skill.
~:Shin:~