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Science 23 August 1968:
Vol. 161. no. 3843, pp. 784 - 786
DOI: 10.1126/science.161.3843.784
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Articles

Magnetoencephalography: Evidence of Magnetic Fields Produced by Alpha-Rhythm Currents

David Cohen 1

1 Department of Physics, University of Illinois at Chicago Circle, Chicago 60680

Weak alternating magnetic fields outside the human scalp, produced by alpha-rhythm currents, are demonstrated. Subject ard magnetic detector were housed in a multilayer magnetically shielded chamber. Background magnetic noise was reduced by signal-averaging. The fields near the scalp are about 1 x 10-9 gauss (peak to peak). A course distribution shows left-right symmetry for the particular averaging technique used here.


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