Brains have the equivalent of memristors. Changing the value of the memristors gets harder the more charge it has. That is why spaced repetition as a learning m

Brains have the equivalent of memristors. Changing the value of the memristors gets harder the more charge it has. That is why spaced repetition as a learning method works as a memory technique. When we sleep the brain organsizes and decides what to keep/forget. Artificial intelligence probably needs to emulate sleep.