2007-12-11 00:24:25 · 11 answers · asked by Russel B 1 in Health ➔ General Health Care ➔ Injuries
hey chris thanks that exactly what i meant, very very interesting answer
2007-12-11 01:30:01 · update #1
Whilst you don't see literal "stars" (ie big yellow stars, Tom and Jerry style) you can get a "twinkling effect". I usually get this a couple of times a game on the rugby pitch!
Seeing stars is usually due to a lack of blood reaching the brain, and thus a lack of oxygen. Most commonly this happens after standing up quickly or straightening after bending over. You don't see it all the time because the arteries serving the brain reflexively dilate to maintain pressure, but those reflexes may be disturbed by lack of sleep or food, a hangover, or an infection. Physical trauma may also cause the reflex to malfunction, which is why stars float around Sylvester the Cat's head when he gets bonked. Rarely, seeing stars can be caused by too much blood reaching the brain.
The stars you see are actually neurons in your visual cortex misfiring, a hallucination at the lowest possible level. When the neurons' oxygenation changes drastically, their membrane potential also changes. Ordinarily this wouldn't matter, because all of the surrounding neurons' potentials would change at the same time. When it happens due to standing quickly or taking a few G's of acceleration, the change happens so fast that the neurons closest to capillaries change well before the surrounding neurons. This causes them to fire spontaneously which your brain interprets as vision; you see stars.
2007-12-11 00:35:30 · answer #1 · answered by Chris 2 · 1⤊ 0⤋
I think I've bumped my head a lot and never seen stars or birdies that's a cartoon thing. Interesting though I wonder where they get the idea from.
2007-12-11 08:48:09 · answer #2 · answered by Grinning Football plinny younger 7 · 0⤊ 0⤋
I assume you mean some kind of blobs. That is what I see, and it doesn't matter whether you have your eyes open or closed right? Well I think it has something to do with increased blood pressure following head trauma.
2007-12-11 08:33:14 · answer #3 · answered by Brent 3 · 2⤊ 0⤋
Never seen stars after bumping my head. Maybe it's because people do it outside at night.
2007-12-11 08:27:52 · answer #4 · answered by LoveBeingAMum 5 · 1⤊ 1⤋
Never mind the stars, how about the voices i always hear in my head!!!!Aaarrggghhh
2007-12-11 08:32:53 · answer #5 · answered by Tammy S 3 · 0⤊ 1⤋
I don't see stars, I see chirping birds flying tight circles around my head.
2007-12-11 08:34:58 · answer #6 · answered by Joe Angus 7 · 1⤊ 1⤋
I always see small white dots with tails... surprisingly like tadpoles or sperm... maybe it's a flashback to our pre-embryo self
2007-12-11 08:37:18 · answer #7 · answered by Ryan L 3 · 1⤊ 0⤋
When you bump your head... where you under the moonlight?
2007-12-11 08:59:40 · answer #8 · answered by Anonymous · 0⤊ 0⤋
Because we are cartoons.
2007-12-11 08:27:46 · answer #9 · answered by YahooGuru2u 6 · 1⤊ 1⤋
you dont...that was just made up by walt disney
2007-12-11 08:30:59 · answer #10 · answered by Anonymous · 1⤊ 2⤋