Fig. 3
From: Human detection thresholds of DC, AC, and hybrid electric fields: a double-blind study
Percentage of participants (n = 203) showing sensitivity index d′ ≥ 1 for different EF types: a DC EF and DC EF with ions. Ion current densities were 80 nA/m2 at 14 kV/m, 200 nA/m2 at 22 kV/m, 300 nA/m2 at 30 kV/m, and 400 nA/m2 at 38 kV/m; b AC EF; c hybrid EF: various DC EF (x-axis) with a constant AC EF of 4 kV/m; and d hybrid EF: various DC EF (x-axis) combined with an ion current density of 10 nA/m2 and a constant AC EF of 4 kV/m