Neville Moray was a smart man who studied how our brains work and how we pay attention to things. He found out that when we are given too many things to focus on, we might not be able to pay attention to everything. It's like when you are playing with too many toys at once, you might not be able to play properly with any of them.
So, Moray did an experiment where he played different sounds to people, and he asked them to listen out for a specific sound, like their own name. He found out that when people were really concentrating on something, they didn't notice other sounds, even if those sounds were important.
He also found out that people could filter out noises that were repeated, like the buzzing sound of a fan. This means that even if you are playing games or watching TV in a busy room, you can still concentrate and enjoy it because your brain learns to block out the noises it's heard before.
Overall, Moray taught us a lot about how our brains work and how we can handle lots of different things going on at the same time without getting too overwhelmed.