 In the 70s , AI was subject to critiques and financial setbacks . AI researchers had failed to appreciate the difficulty of the problems they faced . Their tremendous optimism had raised expectations impossibly high , and when the promised results failed to materialize , funding for AI disappeared . At the same time , the field of connectionism ( or neural nets ) was shut down almost completely for 10 years by Marvin Minsky 's devastating criticism of perceptrons . Despite the difficulties with public perception of AI in the late 70s , new ideas were explored in logic programming , commonsense reasoning and many other areas . 
 In the 70s , AI was subject to critiques and financial setbacks . AI researchers <a href='been_done' title='1'><mark>had</mark></a> failed to appreciate the difficulty of the problems they faced . Their tremendous optimism <a href='been_done' title='2'><mark>had</mark></a> raised expectations impossibly high , and when the promised results failed to materialize , funding for AI disappeared . At the same time , the field of connectionism ( or neural nets ) was shut down almost completely for 10 years by Marvin Minsky <a href='null_genetive' title='3'><mark>'s</mark></a>devastating criticism of perceptrons . Despite the difficulties with public perception of AI in the late 70s , new ideas <a href='uninflect' title='4'><mark>were</mark></a> explored in logic programming , commonsense reasoning and many other areas . 
In the 70s , AI was subject to critiques and financial setbacks . AI researchers done failed to appreciate da difficulty of the problems they faced . Their tremendous optimism done raised expectations impossibly high , and when tdapromised results failed to materialize , funding for AI disappeared . At the same time , the field of connectionism ( or neural nets ) was shut downn almost completely for 10 years by Marvin Minsky  devastating criticism of perceptrons . Despite the difficulties with public perception of AI in thdaate 70s , new ideas was explored in logic programming , commonsense reasoning and many other areas .