How was Robert Bárány awarded the Noble Prize in Physiology or Medicine?

Name: Robert Bárány.
Country: Austria-Hungary.
Date of Birth: 22 April 1876.
Died: 8 April 1936.
Education: University of Vienna (MD).
Subjects Of Study: Cerebellum diagnosis disease vestibular system.
Noble Prize Year: Nobel Prize for Peace in 1914, his work on the physiology and pathology of the vestibular apparatus.