A very handy and delicate design
Everything they can alter..
If they don't like a thought they can instantly change the entire thought with a new one!
If their emotions overflow they can turn it off with something which overflows more than the current!
If they feel low,they can fill it up high which makes them high!
It's like a door holding push and pull on their respective side. But door opens both the ways.
You push from the pull side,it opens
You pull from the push side,it opens
Is it a flaw or over safety measure!
Humans indeed are strange like the push pull door