Fuente: IMDB

"Philip K. Dick first came up with the idea for his novel 'Do Androids Dream of Electric Sheep?' in 1962, when researching 'The Man in the High Castle'. Dick had been granted access to archived World War II Gestapo documents in the University of California at Berkley, and had come across diaries written by S.S. men stationed in Poland, which he found almost unreadable in their casual cruelty and lack of human empathy. One sentence in particular troubled him: "We are kept awake at night by the cries of starving children." Dick was so horrified by this sentence that he reasoned there was obviously something wrong with the man who wrote it. This led him to hypothesize that Nazism in general was a defective group mind, a mind so emotionally flawed that the word human could not be applied to them; their lack of empathy was so pronounced that Dick reasoned they couldn't be referred to as human beings, even though their outward appearance seemed to indicate that they were human. The novel sprang from this."