Human skin offers resistance to electric current just like a resistor do in an electronic circuit. This transient change in the electrical conductivity of the skin followed by an arousal or oriented response is referred to as Galvanic skin response or GSR.
Human skin offers resistance to electric current just like a resistor do in an electronic circuit. This transient change in the electrical conductivity of the skin followed by an arousal or oriented response is referred to as Galvanic skin response or GSR. In a fully relaxed person, the skin offers very high resistance and the skin’s surface is around 40mV with respect to the inner tissue. Sweating in the high emotional state or stress causes increased blood flow to the skin and reduces the skin resistance and increases its electrical conductivity. This phenomenon is widely used in Medical and Forensic sciences to assess the mental state of a person.
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This is my circuit published in Electronics for You magazine September 2005 issue. This Stress meter lets you assess your emotional pain.It gives audio visual indication when the stress level is too high. It is too small and can be wear on the wrist to monitor the Stress level
Circuit in PDF
This is my circuit Skin Response Meter published in Electronics For You magazine June 2009 issue. This circuit tells you that whether your body is relaxed or not. It exploits the skin’s galvanic property to measure the stress level of the body. Even though the circuit do not measures the stress level precisely, it can be used as an indicator to know the stress level. Many relaxation techniques are now in practice to keep the body in relaxed condition. The circuit described here is useful to monitor the stress level before and after practicing a relaxation exercise. Full circuit in PDF
Skin Respose Meter Circuit
Stress is a physiological condition in which the body becomes excited to face an emergency situation. A number of physiological changes including increase in heart rate, breathing rate etc. occurs during a high stress state. There is a relationship between Stress and the Electrical conductivity of the skin. This is known as Galvanic Skin Response or GSR. Skin conducts electric current like a Resistor used in electronic circuits.