Oliver Sacks was a British neurologist who worked in the United States and believed the brain was incredibly complex. In the 1960s, he sought permission to treat a group of catatonic patients in a Bronx hospital with L-Dopa, a drug used for Parkinson's disease, speculating it could help their extreme rigidity. Administering L-Dopa to the patients, who had survived an 1917-1928 epidemic of encephalitis that severely reduced dopamine production, had beneficial effects and revived them from their catatonic states temporarily, as depicted in the film Awakenings based on Sacks' work.