Can you explain what goes on in human brains?
AI, by contrast, is engineered by humans, so why is it humans can't explain it?
If this was true, the phenomena of feral children would not exist [1]. Human brains are socially engineered by an array of informal (family, friends, social context) and formal (schooling, governments) institutions.
You can show the weights of the connections between the nodes, but that wouldn't really help anybody to understand it.