the electrical charge can stimulate both motor and sensory nerves. in some applications, the nerves are stimulated to generate localized muscle activity, i.e., the stimulation is aimed at generating direct muscle contraction. in other applications, stimulation is used to activate simple or complex reflexes. in other words, the afferent nerves are stimulated to evoke a reflex, which is typically expressed as a coordinated contraction of one or more muscles in response to the sensory nerve stimulation.