Execution by electrocution, performed using an electric chair, is a method of execution originating (and almost exclusively employed) in the United States in which the condemned person is strapped to a specially built wooden chair and electrocuted through electrodes fastened on the head and leg. This execution method, conceived in 1881 by a Buffalo, New York dentist named Alfred P. Southwick, was developed throughout the 1880s as a supposed humane alternative to hanging, and first used in 1890. This execution method has been used in the United States and for several decades in the Philippines. While death was originally theorized to result from damage to the brain, it was eventually shown in 1899 that it primarily results from ventricular fibrillation and eventual cardiac arrest.