At which frequencies is the human body most sensitive to electrical current?

1. Sensitivity is measured by the smallest current that produces a given effect. 2. That minimum current is lowest, so sensitivity is highest, near 50 and 60 hertz. 3. Those are precisely the frequencies in common use, which is an unlucky coincidence. 4. The body is slightly less sensitive at zero frequency, which mildly supports Edison's claim about AC. 5. Sensitivity keeps falling as frequency rises, because nerves have a maximum rate at which they can fire. _Source: OpenStax College Physics (CC BY 4.0), Ch 20 "Electric Current, Resistance, and Ohm's Law", section Shock Hazards_