I honestly have no idea. That's likely why my brain has been focused on trying to figure it out for days.
The "reward" system for a standard neural network is simple, from what I understand of it. It's just adjusting certain numbers in the neural net to make certain outcomes more likely. Our brain's reward system is far more complex. Although it does use various means to reinforce certain patterns, just like in an artificial neural net, there's also pleasure involved. I have absolutely no idea how we could possibly program pleasure into an AI or bot, yet I have a feeling it might actually be a necessity for certain AI tasks. Like when you make an AI that creates art. You could train it to create art based on famous artists. You could even use data on what people like, or how much they pay for different pieces of art, to make the AI more likely to create beautiful works of art that people will pay heaps for. You could even feed in data on the influences of different artists, so it could likewise create art that's based on certain famous paintings, while also being altogether different. But how do you teach it to "like" certain things? How do you teach it to enjoy certain artwork, and use that to create it's own?