Neurophysiological methods evaluate the function and diseases or injuries of the central and peripheral nervous system by analyzing the electrical signals generated in the nerve and muscle cells as well as in the cortical neurons. The most common diagnostic methods for diagnosis include neurography (ENeG), electromyography (EMG) and electroencephalography (EEG). The investigations are conducted by biomedical technologists and physicians in clinical neurophysiology, which is an independent neurological specialty in Sweden. The planning and conductance of the studies are determined by clinical neurological symptoms and issues. In the final assessment, the neurophysiological and clinical findings are combined.