Is it possible, from electric potentials recorded from the
surface of the skin, to determine whether the person being measured is
drowsy/asleep? If so, does this have to be done from the scalp, or can
it be done from the fingers of the hand (like in biofeedback)? If it
can, how expensive is it to get a piece of electrical equipment which
can do this? Are conductive creams required between electrodes & skin,
or can the electronics amplify signals gotten from dry contacts? If
anyone has any info, or any references, please email to
mlevin at husc8.harvard.edu.
Mike Levin