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

  title={Magnetoencephalography: Evidence of Magnetic Fields Produced by Alpha-Rhythm Currents},
  author={David Cohen},
  pages={784 - 786}
  • D. Cohen
  • Published 23 August 1968
  • Physics
  • Science
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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