What is Electrodermal Activity (EDA)?

Electrodermal activity refers to electrical changes measured at the surface of the skin that arise when the skin receives innervating signals from the brain. For most people, if you experience emotional arousal, increased cognitive workload or physical exertion, your brain sends signals to the skin to increase the level of sweating. You may not feel any sweat on the surface of the skin, but the electrical conductance increases in a measurably significant way as the pores begin to fill below the surface.