 These critiques were not taken seriously by AI researchers , often because they seemed so far off the point . Problems like <unk> and commonsense knowledge seemed much more immediate and serious . It was unclear what difference " know how " or " <unk> " made to an actual computer program . Minsky said of Dreyfus and Searle " they <unk> , and should be ignored . " Dreyfus , who taught at MIT , was given a cold shoulder : he later said that AI researchers " <unk> not be seen having lunch with me . " Joseph Weizenbaum , the author of ELIZA , felt his colleagues ' treatment of Dreyfus was <unk> and childish . Although he was an outspoken critic of Dreyfus ' positions , he " deliberately made it plain that theirs was not the way to treat a human being . " 
