EEG measurement 1

[venom]

Anybody know a way of collecting EEG signals without using electrodes attached to the head??

 

[dspDad]

The MEG or magneto-encephalogram does that. Uses an array of supercooled magnetic pickups to measure brain electrical activity not only at the surface, but at depth.

Dspdad

 

[prutchi]

It is possible to detect biopotential signals without body contact. A paper by R J Prance et al (2000 Meas. Sci. Technol. 11 291-297, "An ultra-low-noise electrical-potential probe for human-body scanning") describes "a very-low-noise, high-input-impedance probe developed to make non-contact measurements of electrical potentials generated by currents flowing in the human body. With a noise level of 2 µV Hz-1/2 at 1 Hz, down to 0.1 µV Hz-1/2 at 1 kHz, and an operational bandwidth from 0.01 Hz to 100 KHz..."

I have provided links to the papers (and circuit diagrams) that are available online at:

http://home.comcast.net/~prutchi/index_files/schematics.htm

Best Regards,

David