Noninvasive EEG
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 Sussex).
Reported by: Harland et al., Applied Physics Letters, 21 October 2002
Associated Physics News Update
University of Sussex Physical Electronics and Instrumentation Group