In a Presidential System, the head of state and head of government tends to be the same person. In a Parliamentary System, minority groups can form third, fourth, and fifth parties and have much more influence in government than in a Presidential System where third parties are marginalized (many complexities here).
EMGs can detect abnormal muscle electrical activity in many diseases and conditions, including inflammation of muscles, pinched nerves, damage to nerves in the arms and legs, disc herniation, and degenerative diseases such as muscular dystrophy, Lou Gehrig's disease and Myesthenia gravis, among others.
An ECG measures electrical activity of the heart. An EEG evaluates electrical impulses of the brain and nerves. An ECG is used to detect heart ailments in patients who have suffered heart attacks or abnormal heart rates. An EEG is a staple test for patients with seizures, tumors, coma or nervous disorders.