The problem of measuring without particle interaction...

[etoven]

explain

Also, I've never seen someone's head with a built in interferometer system and laser emitters :D.

:o I think there's fairly iresputable evidance that paranomally gifted indeivduials do exist (aka. people bending spoons with there minds for example).

As much of a mistery as the human brain is, what can we really say about someones head. It may not contain laser emitters however it may have the biological equivalent.