> 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

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