well head injuries it can lead to several different things one can lead to serious blood gushing out of your brain and it can paralyze you to where you can't do the things you love anymore.it can lead to hearing loss or you can go blind. the hippocampus is designed to help you think and it can mess that up to where you can't think clearly. and all I can say is don't get a head injury . and one last thing is it can also make you speechless.
