[rosh009]

well!as far as my knowledge goes,brain mapping m/c works as follows:
electrodes are attatched to patients scalp with a electrolyte like liquid/paste.
and this catches the electrical activity of brain and inputs to a machine which processess data and outputs the required data in the form of graph on the screen.
and this working of brain mapping m/c comes under a fascinating
field called NEUROTECHNOLOGY!
and what i feel is that if at all dream tapping m/c is going to be invented ,then NANOTECHNOLOGY is going to play an important role!