1. A change in the electrical properties of the skin in response to stress or anxiety which can be measured either by recording the electrical resistance of the skin or by recording weak currents generated by the body.
2. A technique by which sensors monitor the skin's electrical resistance to treat anxiety disorders, chronic pain, hyperhidrosis, and stress.
3. A transient change in certain electrical properties of the skin, associated with the sweat gland activity and elicited by any stimulus that evokes an arousal or orienting response.

Originally it was termed the psychogalvanic reflex, which later became known as the galvanic skin response.