Magnetic field of a nerve impulse: first measurements

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Science  04 Apr 1980:
Vol. 208, Issue 4439, pp. 53-55
DOI: 10.1126/science.7361105


The magnetic field of the action potential from an isolated frog sciatic nerve was measured by a SQUID magnetometer with a novel room-temperature pickup coil. The 1.2 x 10(-10) tesla field was measured 1.3 millimeters from the nerve with a signal-to-noise ratio of 40 to 1.

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