for instance if you are riding a bike or driving a car or walking on the side of the road and someone in a car or motorbike almost hits you your brain body automatically responds due to your perception and interpretation of a threat in your environment
For instance if you are riding a bike or driving a car or walking on the side of the road and someone in a car or motorbike almost hits you your brain body automatically responds due to your perception and interpretation of a threat in your environment