Original: In psychiatry, dysaethesia aethiopica was an alleged mental illness described by American physician Samuel A. Cartwright in 1851, which proposed a theory for the cause of laziness among slaves.
Simplified: Dysaethesia Aethiopica was a term to describe a mental illness which was believed to be why Afro-American slaves were lazy. American physician Samuel A. Cartwright described the condition in 1851.