Insights for Natural Balance

About Galvanic Skin Response (G.S.R.) Testing


The body is comprised of various systems that respond to stimuli. The smell of food (stimulus) triggers the mouth to salivate (response). A loud noise (stimulus) triggers the release of adrenaline into the blood and an increased heart rate (response). There are various ways to measure the body's response to stimuli, including GSR or Galvanic Skin Response. GSR measures the conductivity of the largest organ in the body, the skin.


The conductivity of the skin was first discovered around 1888 by Tarchanoff and Vigoroux.  In the early 1900s, Dr. Carl Jung found that GSR measurements could track physiological arousal or stress in the body. In the 1930s, Dr. Hans Selye began to uncover the importance of understanding stress and its impact upon the different systems of the body. Discovering the importance of stress in the body, its effect on our health, and its ability to be measured in the body through GSR, led to the creation of biofeedback devices, such as the polygraph test. In 1953, German physician Dr. Voll found acupuncture points on the hands and feet with Galvanic skin response and then when he stressed these points with galvanic skin response technology, he received feedback regarding the strength or weakness of the meridians. His biofeedback device was the first to develop a logical and measurable model of the electrical energetic body. This was the beginning of the first EAV (Electro-Acupuncture according to Dr. Voll) or electro-dermal biofeedback systems. Acupuncturists train to determine meridian flow strengths and weaknesses through a stress given to the arterial pulses. Through biofeedback GSR measurement, stress responses relating to functional disorders can be seen before they become and when they are pathological.


The Zyto Hand Cradle is FDA cleared as a class II medical device and it is the advanced technology of probe and electrode testing. Much like a polygraph technician asking questions and evaluating the body's responses, GSR assists the user by measuring the stress responses to virtual stimuli in real time. In a sense, the hand cradle provides the stress stimulus and measures how the body responds. This information is then organized into a report for the practitioner to assess. A "Stress Profile" reveals the state of balance and imbalance within the energetic and biological systems including; meridians, vertebra, teeth, and organs. The hand cradle then queries the body with possible “Balance Profile” solutions and measures the responses to determine which combinations provide the best coherence of energy and stress reduction. This is critically important to understanding what nutrients, homeopathic, and herbal solutions will benefit each particular person.  When using the Zyto GSR, protocols are determined for health recovery and individualized programs are implemented to restore; normal nutrient intake, waste removal, communication and energy production to the cells, organs, and systems of the body as a whole.


Zyto GSR testing is not used to diagnose, treat, cure or prevent any disease. This technology is very beneficial to the practitioner in determining stress patterns of the Central Nervous System and assists in identifying nutrient balancers.


Boucsein, W. (1992). Electrodermal Activity, Plenum Series in Behavioral Psychophysiology and Medicine, Plenum Press.

Dawson, M.E. & Schell, A.M. (1990). The Electrodermal System, in Cacioppo,J.T. & Tassinary, L.G. (Eds.) Principles of Psychophysiology: Physical,social, and inferential elements. The Cambridge Press, Cambridge.

Fere, C. (1988). Note on changes in electrical resistance under the effect of sensory stimulation and emotion. Comptes Rendus des Seances de laSociete de Biologie (Series 9), 5, 217-219.

Kahneman, D. (1973). Attention and Effort. Prentice-Hall: EnglewoodCliffs, N.J.

Lyyken, D.T., & Venables, P.H. (1971). Direct measurement of skin conductance: A proposal for standardization, Psychophysiology, 8 (5),656-672.

Vigouroux, R. (1879). Sur le role de la resistance electrique des tissuesdans le’electrodiagnostic. Comptes Rendus Societe de Biologie (Series 6),31, 336-339.

Vigouroux, R. (1888). The electrical resistance considered as a clinical sign. Progres Medicale, 3, 87-89.




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