Electrodiagnosis is an advanced technique for getting information regarding various diseases. Applications of electrodiagnosis; namely electromyography (EMG), nerve conduction studies, late responses, repetitive nerve stimulation techniques, quantitative EMG and evoked potentials have long been reviewed in numerous books as fundamental principles. Nevertheless, the application of electroneuromyography is rather innovative in some aspects when compared with the tasks of daily practice. This book encompasses and enlightens those aspects where electrodiagnosis has begun to play important roles nowadays.