The initial path might have been programmed by a human, but as it runs through games it solidifies successful strategies, making them more likely to be expressed as behaviour in response to certain game cues.

I’m talking out my ass when it comes to computers, but I have a degree in neuroscience. Your brain forms stronger connections in networks which are activated frequently or are rewarding. Forming and strengthening connections is a huge part of how our brains learn, this computer seems to have a larger and more precise way of forming those connections.