Walking Troubles of Organic Hemiplegy (1898) is the first documentary film in the world, created by Romanian neurologist Gheorghe Marinescu. The film depicts several patients walking in four directions against a black background before and after treatment.
Marinescu came to the idea of making the film after having used chronophotography under the influence of ÃÂtienne-Jules Marey. Marinescu praised the use of the cinematographic techniques in the scientific investigation.