Key: i Threshold values for magnetophosphenes; the upper curve corresponds to magnetic fields where phosphenes were observed as patterns.
Changes in visually-produced potentials (from Silney, 1981].
$ D_{1} $ Experimental values for cardiac stimulations, calculated for humans from experiments conducted on animals (from Silney, 1986).
For curves A, B, C and D, see the notes given in Fig. 16.
Notes: 1. The magnetic field is varying sinusoidally.
2. Due to larger conductivities and current loops at a local level, induced body-current densities may exist at levels which are higher by one order of magnitude than those indicated.
FIGURE F-4: MAGNETIC FLUX DENSITIES WHICH INDUCE APPROXIMATELY THE INDICATED CURRENT DENSITIES IN THE BRAIN AND THE HEART OF A MAN