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

Overview

Journal Science

Specialty Science

Date 1968 Aug 23

PMID 5663803

Citations 125

Authors

D Cohen

Affiliations

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Abstract

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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