EEGs can now record brainwaves without the need for electrodes to be
inserted into the brain or even for them to be placed on the scalp.
The figure shows a brainwave trace for periods when the eyes are open
and when they are closed. The red regions respond to the alpha wave
(eyes closed) at a frequency of around 9 Hz. (Courtesy University of
Reported by: Harland
et al., Applied Physics Letters, 21 October 2002
Sussex Physical Electronics and Instrumentation Group