View Full Version : Visual experiment 1

Fat Tone
14th February 2003, 05:43
Try this for fun:

The links below will show you an image for a while, that every so often will get briefly covered in 'mudsplashes'. Can you see any other details in the picture changing?

Please DON'T post the answers here. I'll post an explanation in a day or two.
traffic (http://nivea.psycho.univ-paris5.fr/Mudsplash/Nature_Supp_Inf/Movies/traf.GIF)

airplane (http://nivea.psycho.univ-paris5.fr/Mudsplash/Nature_Supp_Inf/Movies/apont.GIF)

dinner (http://nivea.psycho.univ-paris5.fr/Mudsplash/Nature_Supp_Inf/Movies/Diner%20%88%20deux.GIF)

Good Luck!


14th February 2003, 05:50
Yep - got them all :) Once I got the first one (took me a few moments though!) the 2nd two were easy.

14th February 2003, 06:16
the first was a bit tricky, 2nd and 3rd very easy.

14th February 2003, 07:37
Thought they were all pretty simple...but maybe we're not catching everything?

Jon P. Inghram
14th February 2003, 10:53
The little flashing boxes do a nice job of diverting your notice, even when you're trying to see the whole picture as one, neato.

14th February 2003, 12:48
Yeah those were pretty neat, I like the first one it took me the longest of them all


14th February 2003, 13:48
As soon as I've downloaded them I noticed the whole thing...a bit too easy for me...
Maybe that's because I'm good in seeing the whole surrounding (I remember that once a doctor before he gave me permission to driving licence couldn't believe for a moment that I have pretty effective ~180 degrees eyesight; but of course not so effective as in the center of view...).

Guess I would be amazed by surround gaming ;P

14th February 2003, 21:10
I'm sure my neigbours cat can see at least that when I pull his scalp back... sure isn't normal lookin tho :D

15th February 2003, 01:24
Greebe, whanna phone number to that doctor? (If he's alive that is...and that's really IF).

Anyway what I've mentioned whas several years ago...but it's not too difficult to make such test - just stand at the wall touching it with back of your head. When I do that I see what's in the corners of that wall (and I don't live in typical old polish building in wchich walls give new meaning to word "line" ;P). Of course not with all the details, but I see general shape, color and movement...

Seriously, do this: look at someone's face from the side. You'll be able to see the pupil (wchich means that it also 'accumulate' light that's coming from you); the only little problem is that this light in most people eyes after it passes through lens of the eye doesn't hit retina, because it just isn't there.
Shape of it it's a lottery - I've got that kind of lot (wchich is completely useless btw; well, maybe not completely - you shoud really see that doctor repeating couple of times "how many thingers do you see?!" ;P)

15th February 2003, 02:53
First one took a while, then the 2nd and 3rd was easy.

Fat Tone
17th February 2003, 08:32
Bump - detail later :)

Fat Tone
19th February 2003, 01:48
I hope you all enjoyed that. Of couse, you would eventually have noticed the white line, the shadow & the rail changing. Some people get it quicker than others.

The phenomenom being demonstrated is called change blindness. I came across it because I have to implement a version of it for work.

Here is a brief descripton from here: (http://nivea.psycho.univ-paris5.fr/Mudsplash/Nature_text/mudtext.html)

"When a few small, high contrast shapes are briefly spattered over a picture, like mudsplashes on a car windshield, very large changes can simultaneously be made in the scene without these being noticed. This occurs even when the mudsplashes do not in any way cover or obscure the changes. The phenomenon is important in driving, surveillance or navigation, since it shows that possibly dangerous events occurring in full view may go unnoticed if they coincide with even very small, apparently innocuous disturbances. The phenomenon is also of theoretical importance in understanding the way the brain represents the visual world. "

You can see more examples at http://nivea.psycho.univ-paris5.fr/Mudsplash/Nature_Supp_Inf/Movies/Movie_List.html

19th February 2003, 01:50
Thanks Tone! Interesting...

18th March 2003, 14:00
I like stuff like that. And I get 403 forbidden :(


18th March 2003, 14:03
Originally posted by az
I like stuff like that. And I get 403 forbidden :(

Same here. (for both comments)

Fat Tone
18th March 2003, 14:04
looks like they removed the stuff :(

18th March 2003, 14:19

If you have any more of these, post 'em, please :)


18th March 2003, 14:31
Sounds very interesting, though the links went dead before I got a chance to look, I have seen some that sound rather familiar.

I've got pretty bad vision (thank god for thin lenses), but I can easily detect even the smallest change in center and peripheral vision. Not sure if I can see the corners when standing directly against a wall...