Although the exact physiological mechanism is not completely understood, it is generally accepted that SC varies directly with the amount of sweat secreted by the skin and indirectly with the number of sweat glands that are activated by the SNS. Biofeedback applications of SC generally involve reducing stress levels and training adaptability. SC is also useful for evaluating the effectiveness of relaxation practices. As the amount of stress increases, so does the skin conductance level. Relaxation decreases SC. Because it is highly sensitive to instantaneous emotional changes, SC is frequently used to reflect such reactions as anger, fear, or sexual feelings and to measure the startle response (response to a visual or auditory stimulus). SC is also an important component in lie detection systems (polygraphs). - See more at: http://www.thoughttechnology.com/sciencedivision/pages/products/skinconduct.html#sthash.UbPqRJNW.dpuf