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Yardman



Joined: 12 Apr 2005
Posts: 245
Location: US
Yardman
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Last edited by Yardman on 04 Apr 2012, 02:10; edited 1 time in total
Post 28 Jul 2007, 06:31
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LocoDelAssembly
Your code has a bug


Joined: 06 May 2005
Posts: 4633
Location: Argentina
LocoDelAssembly
Good one Yardman Very Happy
Post 28 Jul 2007, 17:20
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Yardman



Joined: 12 Apr 2005
Posts: 245
Location: US
Yardman
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Last edited by Yardman on 04 Apr 2012, 02:29; edited 1 time in total
Post 28 Jul 2007, 19:48
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sleepsleep



Joined: 05 Oct 2006
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sleepsleep
nice, i saw it green, but if i focus more, i saw the pink dot missing one by one after the green.

just wanna ask, is there a size limit for effect like this?
eg. if i put the same gif in a more larger size? eg. A5 size?
Post 29 Jul 2007, 12:41
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tom tobias



Joined: 09 Sep 2003
Posts: 1320
Location: usa
tom tobias
Excellent illusion. As previously noted, when the observer sits sufficiently close to the screen, a tad closer than normal, i.e. eyes about 20-25 cm from screen, the pink dots disappear, because the cones are all focused on the center cross. The dots return, and appear to move, this time, green in color. Mechanism: I am uncertain. Here's a fact: The eyes are not stationary. We think they are stationary, but they are moving all the time. These movements are very fast, and embrace only a small portion of the visual field. You can read about optokinetic nystagmus here:
http://psychology.ucalgary.ca/PACE/VA-Lab/Marcela/Pages/page15.html
and here:
http://www.emedicine.com/oph/topic339.htm
and finally, here:
http://www.dizziness-and-balance.com/practice/nystagmus.html
Why do the dots now rotate? Why are they now GREEN, instead of red?
One possible explanation for this, again, I am not sure this is correct, I am just guessing on the mechanism: Fact: there are different receptors for each color. In other words, we have people who are "color blind"
http://en.wikipedia.org/wiki/Color_blindness
http://www.toledo-bend.com/colorblind/Ishihara.html
because some of the receptors in the retina, i.e. some of the cones are missing, else non-functioning. Point is that ALL of us have specialized receptors, activated only by certain wavelengths of light. The three fundamental types of receptor are those for three main colors: red, green, and blue. Note, that this is not the same as the three primary colors: red, yellow and blue. So, why then, do we perceive a shift in the color of these spots from red to green, i.e. why is a different population of cones responding, compared with the early view, when we first look at the image? One possibility is local retinal inhibition of the red cones. A second possibility is visual cortex inhibition of the input from the retina (which relays in the thalamus--lateral geniculate body, i.e. the axons from the retina do NOT travel directly to the neocortex.) So, there are some inhibitory influences which may play a role. If the spots contain the green color to begin with, why are they not detected as green? Perhaps the color of the spots is largely red, with only a small amount of green. I really do not have a suitable explanation. Sorry I could not provide an answer to this interesting illusion, but, I did finally learn, that there was indeed a guy in the apparatus, a midget, playing chess in the 19th century "computer". The illusion that the interior of the apparatus contained only gears and levers and mechanical components was facilitated by opening up the doors on both sides, so that it looked as though one could peer into the interior, to rule out the presence of a human. Sometimes, inhibitory influences in the visual system can be also very subtle, and yet, very important for the illusion to succeed in tricking the brain.
Smile
Post 29 Jul 2007, 13:02
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