Definition of Electrodermal Response (EDR)

Electrodermal Response (EDR), also known as Galvanic Skin Response (GSR), is a physiological measure that assesses the conductance of the skin in response to emotional or autonomic arousal.

Overview

EDR measures the changes in electrical conductance of the skin, particularly in relation to the secretion of sweat from the sweat glands. It is a widely used method to monitor the sympathetic nervous system activity and the physiological response to psychological stimuli.

Measurement

EDR is measured using electrodes placed on the surface of the skin, typically on the fingers or palm. These electrodes detect the minute changes in the skin’s electrical conductance caused by the activation of sweat glands. The recorded values are then amplified, filtered, and analyzed to assess the magnitude and timing of the electrodermal response.

Application and Significance

EDR is commonly employed in fields such as psychology, neuroscience, and market research to measure emotional arousal, stress levels, or cognitive load. It provides valuable insights into the autonomic responses of an individual, aiding in the understanding of emotional experiences, physiological reactivity, and the impact of various stimuli on human behavior.

Limitations

While EDR is a useful measure of sympathetic nervous system activity, it does not directly indicate the specific emotional state or cognitive processes associated with the arousal. Additionally, factors like humidity, skin hydration, and electrode placement can influence the accuracy and reliability of the EDR measurements.