In any list of movies that explore the meaning of intelligence and the possibility of artificial intelligence, one would probably include Metropolis (1927) and 2001: A Space Odyssey (1968). However, I could not think of any film made between these two dates (1927 and 1968) that seemed to explore the nature of artificial intelligence. I would not include incidental robots (like Gort or Robby) to be an exploration of what it means to be intelligent.
There seems to be a 40 year gap in which questions of artificial intelligence were not discussed cinematically and only 2001 restarted the discussion. Is this correct or am I missing major films made between 1927 and 1968 that explored what it means to be artificially intelligent or for a human to create intelligence? If not, then what explains this gap? Can anyone shed more light on the situation of artificial intelligence in movies during that period?