good question, a scream or yell when one is in danger is designed to not only voice your fear, but also to help you overcome it easier and keep running away from (or in the case of a battle towards) your enemy. That is why a large battle cry would always be shouted in wars when people still fought with swords, because soldiers were never exactly without fear when a bunch of sharp objects and blades were flying everywhere around them. The yell from their gut would help stimulate their adrenaline, and keep them moving.
4 months ago
Last edited at 7:43AM on 11/20/2013
The brain makes us do different things so that fear grabs hold of us. It makes alert to dangers. The brain releases adrenaline and nervousness as well as being scared. Since we associate screams with being scared, the brain will make us do that, to alert us if dangers even more. The more scared a person is, the more cautious they are.
I guess... Reflexes? And to get people's attention so they know somethings wrong, example: If you spotted somebody in your house/home, to let people know you might be in danger??? I'm really not sure, sorry. :)