As with the human brain, the neural networks that power artificial intelligence systems are not easy to understand.
DeepMind, the Alphabet-owned AI firm famous for teaching an AI system to play Go, is attempting to work out how such systems make decisions.
By knowing how AI works, it hopes to build smarter systems.
But researchers acknowledged that the more complex the system, the harder it might be for humans to understand.
The fact that the programmers who build AI systems do not entirely know why the algorithms that power it make the decisions they do, is one of the biggest issues with the technology.
It makes some wary of it and leads others to conclude that it may result in out-of-control machines.
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