Wired: But what about all the fMRI brain imaging studies of thoughts 
and feelings? Or experiments in which scientists can tell what 
someone is seeing, or what they're dreaming, by looking at brain activity?

Parnia: All the evidence we have shows an association between certain 
parts of the brain and certain mental processes. But it's a chicken 
and egg question: Does cellular activity produce the mind, or does 
the mind produce cellular activity?

Some people have tried to conclude that what we observe indicates 
that cells produce thought: here's a picture of depression, here's a 
picture of happiness. But this is simply an association, not a 
causation. If you accept that theory, there should be no reports of 
people hearing or seeing things after activity in their brain has 
stopped. If people can have consciousness, maybe that raises the 
possibility that our theories are premature.

http://www.wired.com/wiredscience/2013/04/consciousness-after-death/all/

www.peoplewho.org