I don’t think a helmet would be all that helpful. For a person wearing a seatbelt in a modern car with airbags, there really isn’t a lot of hard things to hit your head against.
In these situations, the biggest damage to the brain is something called diffuse axonal injury where rotational forces from the sudden acceleration and deceleration cause injury to the neurons. A helmet would not protect you from that.
In these situations, the biggest damage to the brain is something called diffuse axonal injury where rotational forces from the sudden acceleration and deceleration cause injury to the neurons. A helmet would not protect you from that.