Mental illness has been recognized for over 4,000 years. Early attempts to treat it were often cruel, such as chaining or torturing patients due to beliefs that mental illness was caused by demonic possession. In the late 1800s, some doctors experimented with methods to influence blood flow to the brain like tranquilizer chairs and spinning chairs, but these provided no lasting benefits. Through the 1900s, many mentally ill individuals were institutionalized in asylum conditions that were often deplorable. Lobotomies and electroshock therapy were introduced in the mid-20th century as treatments but often had negative effects and did not cure illness. Understanding and treatment of mental illness has significantly improved since these early attempts.