The conversation between human and AI assistant.
[|Human|] During which decade did neural networks first lead to practically useful systems?
[|AI|] The development of metalâoxideâsemiconductor (MOS) very-large-scale integration (VLSI), in the form of complementary MOS (CMOS) technology, enabled the development of practical artificial neural networks in the 1980s
[|Human|] 
During which decade did neural networks first lead to practically useful systems?