Hey Mark,

Thank you for the reply!

I know I should not feed the anxiety. But, other head bumps I've had occurred over much wider spaces - this was concentrated on a 1x1 inch region of the metal chair's frame. With the impact being less spread out, with my head moving probably 24ish inches downward, it feels like that could have generated enough of a force to actually cause a concussion with my head making contact on such a small, hard surface.

I guess I asked the question about whether or not it was concussive vs. subconcussive to see whether or not it's possible to tell the difference between the two.

Thank you again your your time and insight, Mark.

Sincerely,
Squash