As complex as us humans are, this

is still just a part of the whole picture as both body language and even importantly our brainwave signals!

It is

scientifically proven that brainwaves can be measured as electrical signals, and that ones mood does very well

influence the mood of people nearby. For an example if you interact with an overtly happy and positive person this

will affect your brain to operate in a similar frequency.

Furthermore, the negative energies tend to last even

longer with the exposed subject. Imagine spending one hour with a person who's in a really bad mood, chances are

that the rest of your day is affected in that mood.

So I would probably assume that fear is a projectable state

of mind as well in addition to what has been discussed here.