The Truth activates a larger part of the brain than lies.

What caused the radiation around the head of this person 12.000 years ago?

According to research of American psychologist of Daniel Schacter (1998), the truth activates a larger part of the brain than lies. The brain processes a truthful memory different than a deceitful memory. With a truthful brain the electrical activity of increases whilst the lights of a deceitful brain seem to go out.