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Geek Culture / Vanishing Head Illusion

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Nickydude
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Posted: 19th Mar 2010 19:30
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Worth checking out as it worked for me. http://www.youtube.com/watch?v=O7jpJ12lBjg&feature=channel



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Robert F
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Posted: 19th Mar 2010 19:34
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Haha! That was cool! It weird how you can still the see the black bar out of the corner of your eye to.
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Fallout
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Posted: 19th Mar 2010 19:40
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It's not really an illusion. It's your blind spot. Good way to demonstrate it though.

Radical hamsters skipping furiously into the blue ether, questioning their very existence while breathing out the bitter fog of smoked haddock.
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Lemonade
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Posted: 19th Mar 2010 20:20 Edited at: 19th Mar 2010 20:21
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If its my blind spot, how come I can still see the bar when it passes through that same area?

Pretty cool btw.
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charger bandit
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Posted: 19th Mar 2010 20:57
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Awesome,and it actually worked,woot.


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Zotoaster
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Posted: 19th Mar 2010 21:01
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Lemonade,

Your eye kinda blends in everything from around the blind spot to fill it in, so, you're not really seeing that part of the bar that's covering his head, but actually just other bits of bar smudged in.

"everyone forgets a semi-colon sometimes." - Phaelax
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Fallout
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Posted: 19th Mar 2010 21:17
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Yep. Your brain fills in the space in your blind spot all the time, so you don't notice it's there. Unfortunately, it's not clever enough to recreate an entire human head. Instead, as Zotoaster said, it uses the infomation around it to fill the hole.

Radical hamsters skipping furiously into the blue ether, questioning their very existence while breathing out the bitter fog of smoked haddock.
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nackidno
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Posted: 19th Mar 2010 21:43
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Does the blind spot have any purpose at all or is it just there without a reason? I'm not an expert on the human eye so fill me in.

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Insert Name Here
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Posted: 19th Mar 2010 21:48
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It's where the optical nerve is, I believe. The human eye is a complete disaster, to be honest, it has a massive blind spot, it's full of dark patches, and if it weren't for our brain compensating everything would be upside down. Ironically, all these problems would be solved if the retina was just on the other side.

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nackidno
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Posted: 19th Mar 2010 22:27
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God must've been in a hurry when he designed our eyes then. XD

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Insert Name Here
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Posted: 19th Mar 2010 22:32
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There are actually some creatures with retina in the right place - squid and octopuses and stuff. Creatures that life so deep underwater it's usually too dark to see anyway

[center]You can get further with a smile and a gun than you can with just a smile.
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Aaagreen
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Posted: 19th Mar 2010 23:38
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It obviously wouldn't work if he wasn't on an orange background. The "blind spot" is blending his orangeish face with the orange background, that's why you can see the bar.

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Zotoaster
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Posted: 20th Mar 2010 14:43
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Aaagreen, nope. You wouldn't see his head no matter what colour the background is.

Just curious, but what do you people mean the retina should be on the "other side"?

"everyone forgets a semi-colon sometimes." - Phaelax
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Darth Vader
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Posted: 20th Mar 2010 15:01
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It's a pretty cool illusion even if it is only playing with our blind spot.

Quote: "Just curious, but what do you people mean the retina should be on the "other side"?"

I'm curious about that as well!

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RUCCUS
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Posted: 20th Mar 2010 16:56
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I guess im the only one it didnt work for . Saw his head even when my face was practically touching the screen.
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Seppuku Arts
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Posted: 20th Mar 2010 17:26
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It didn't work for me either.

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Sid Sinister
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Posted: 20th Mar 2010 17:26
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I tried for minutes, and I always saw his head.

"If I have seen a little further it is by standing on the shoulders of Giants" - Isaac Newton
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Nickydude
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Posted: 20th Mar 2010 19:05
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Sit right away from the monitor then move slowly forward.



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xplosys
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Posted: 20th Mar 2010 19:52
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After about 20 minutes, my head disappeared.

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Neuro Fuzzy
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Posted: 20th Mar 2010 20:12
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if you're too close to the monitor, you can see his head, and if you're too far away you can see his head. You have to be right in the right place so that blind spot is covering his head up.

Really cool

Quote: "and if it weren't for our brain compensating everything would be upside down"

I always had a problem with people saying stuff like this... Our brain takes the signals and makes use of them. It's not as black and white as mirrored or unmirrored... and I would imagine that if we saw an unmirrored view, or a view rotated by any angle, we would use about the same "processing power", and wouldn't see the world any differently (of course changing from one view to another would be a lot different, but we would adapt to it eventually).


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Insert Name Here
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Posted: 20th Mar 2010 21:45
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Quote: "the retina should be on the "other side"?"

On the front.

[center]You can get further with a smile and a gun than you can with just a smile.
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Fallout3fan
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Posted: 20th Mar 2010 21:51
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Man how can I do that I could still see his but I kinda got my right eye fuzzy when the video ended

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Green Gandalf
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Posted: 21st Mar 2010 13:29
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Worked fine for me - but then I'm so old I'm probably nearly blind anyway.

I had to move some way from the screen for the illusion to work. I like the inclusion of the bar - very effective.
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Drew Cameron
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Posted: 21st Mar 2010 17:26
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If it doesn't work for you, you aren't doing it right. End of.

Move backwards/forwards.

It's not a case of this being a psychological problem that only some people have, it's a case of everyone literally having a part of their eye missing. If it doesn't work that means your head isn't in the right place when viewing.

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Seppuku Arts
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Posted: 21st Mar 2010 17:53
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^Perhaps true, but I didn't play on tripping over my bed. If I did it now...it'd confuse an awful lot of people sitting in the library...and whilst, yes, that is tempting, I won't...perhaps, maybe, when I find myself distracted again later.

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Virtual Nomad
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Posted: 21st Mar 2010 18:08
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Quote: "It didn't work for me either."

won't work if you have a 13" monitor or were viewing on an iphone

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Hador
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Posted: 21st Mar 2010 21:35
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it didn't work for me, maybe it was my monitor size. mine is close to 13 i think.


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IanM
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Posted: 21st Mar 2010 21:51
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Quote: "Just curious, but what do you people mean the retina should be on the "other side"?"

The nerves that all join together at the blind spot are on the front of the retina, not the back as you would expect (ie, the light has to pass them, and the capillaries too, before it reaches the rods & cones that detect the light).

Basically, the human retina (and all vertibrates) have their retinas back-to-front.

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