I haven't had a concussion...however I was born with some lack of oxygen in an emergency birth. Also I'd argue my long term depression and PTSD has likely done some damage to my brain but not in the traumatic brain injury sense.

But yeah taking psychology I learned long term depression actually can damage the brain and effect memory/cognitive abilities...and then PTSD is said to damage the part of the brain that sort of controls panic/survival reactions. Sort of curious how brain damage caused through traumatic brain injury vs other factors is simular and how it varies.

One of my brothers has had a couple real concussions like the kind that cause puking and my mom had to keep waking him up due to a coma risk if he fell asleep too long or something, and my sister had a couple rather severe ones....it seems my brothers had more trouble from it. I have been hit in the head or bumped it numerous times but haven't seemed to ever get an actual concussion from it.