Galvanic Skin Response (GSR) can also be referred to as Electrodermal Activity (EDA), Psychogalvanic Reflex (PGR), Skin Conductance Response (SCR), or Electrodermal Response (DR). Whatever you want to refer to it as (the remainder of this post will use GSR for the sake of clarity), it is a biometric signal that is used to study the autonomic activation of sweat glands.