Fig. 2.

Measured AP voltage and magnetic field from excised single neurons. (A) Measured time trace of AP voltage ${\mathrm{\Phi }}_{\text{in}}^{\text{meas}}\left(t\right)$ for giant axon from M. infundibulum (worm). (B) Calculated time trace of AP magnetic field B^calc(t) for M. infundibulum extracted from data in A. (C) Measured time trace of AP magnetic field B^meas(t) for M. infundibulum giant axon with N_avg = 600. (D) Measured time trace of AP magnetic field B^meas(t) for L. pealeii (squid) giant axon with N_avg = 375. Gray box indicates magnetic artifact from stimulation current.