Have you ever been in a car accident? If so, you may have reduced gray matter in your brain! What is gray matter you ask? It is where the cells of your brain live. How much gray matter you have is correlated with how intelligent you are.
By the way, gray matter isn't actually gray at all. When you are alive it is a healthy pink because of all the blood flow going through it.
Anyway, your amount of gray matter determines how smart you are, so if you have less of it then you will have reduced brain power!
A study from the November edition of the Scientific Journal "Pain Physician" evaluated 93 women with and without whiplash and found that those with whiplash had "reduced gray matter volume" in brain regions involved in processing cognition and pain.
Basically, if you have ever had whiplash, then you may have less gray matter because of it.
As to whether or not early treatment helps, they theorize that it would but that is a topic for another research paper.