Amazing cognitive illusions -update { Dec 12,2012 }

[VirtLands]

Hi there, I stumbled upon these mysterious images.

Take your time while viewing these images, and the optical
illusions will play tricks on your mind too.

"Lilac chaser ::

Do you see the phantom Green disk? It is an illusion, since there is
no green at all; It's all in your mind.

"Lilac chaser consists of 12 lilac blurred disks arranged in a circle around a
small black, central cross on a gray background. One of the disks
disappears briefly (for about 0.1 second), then the next (about 0.125
second later), and the next, and so on, in a clockwise direction. When one
stares at the cross for about 20 seconds or so, one first sees a gap
running around the circle of lilac disks, then a green
disk running around the circle of lilac disks, then a green disk
running around on the gray background, with the lilac disks having
disappeared or having been erased by the green disk. This is due to an
interesting effect in which the colors of the lilac disks are inverted in the
optical illusion to a green color. "


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Next illusion:

The Ebbinghaus illusion (or Titchener circles) is an optical illusion of relative size perception.

The two orange circles are exactly the same size, however they do not look the same size.


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Next illusion:

Take your time and look at this, and you'll notice that the
discs never stop spinning. If you focus spot on one disc, then
it will temporarily stop spinning, but it's neighbors will continue to spin.
It's all in the mind, right?


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The Hermann Grid ::

Thîs one is most maddening,

there is the illusion here that sometimes the white circle intersections
are replaced by dark blobs which appear at random intersections...

"This illusion is characterized by “ghostlike” gray blobs perceived at the
intersections of a white (or light-colored) grid on a black background.
The gray blobs disappear when looking directly at an intersection."

You may be asking yourself, why do these black blobs keep appearing?
Am I seeing things?


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Next:

If you concentrate on this one, you'll notice that it appears to
flex continuously; However it is not moving at all, it's all in
your mind.


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Spinning Disks Illusion - Moving Disks Illusion

source: http://spectacular-illusions.blogspot.c ... chive.html

When sets of disks with tangential greylevel gradients are arranged in concentric circles (see image above, most observers perceive these disks moving around the centre,. This motion illusion is enhanced for large-scale and bright images and depends to a large extent to dynamic changes in the stimulus such as elicited by involuntary eye movements or blinks – fixating the centre of the pattern does abolish the illusion, whereas scanning the picture the motion sensation. A reliably effective version of this illusion, which does not require eye movements (i.e. persists when observers fixate the target in the centre of the image), can be generated by modulating the background luminance of the array of disks . This stimulus offers the opportunity of studying this motion illusion – the percept of spinning disks in the absence of any physical displacement – in a highly controlled manner in psychophysical and physiological experiments, because it is not depending on involuntary eye movements or eye blinks.

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I don't see it much, but others may notice a slight twirling or twisting
in these slimy spirals.


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I'll post more of these if I can find more. See you next time.

[StinkerSquad01]

Ah, I love illusions! I have a nice book titled "Trick Eyes" by Akiyoshi Kitaoka, I love it because it has many different types, along with some of the science behind illusions, and large pictures. I recommend checking it out sometime.

[yot yot5]

Nice stuff! The illusion with the spinning wheels is used in Mark's level "Lillie's Illusion".

[StinkerSquad01]

Check this out:

[|Cookie|]

Check this out:

Watch out,it's really hurt the eyes.
i didn't tried it because i was scard,but.a lots of people said that.
don't blame me if your going to buy a glasses.

[Muzozavr]

Check this out:

Watch out,it's really hurt the eyes.
i didn't tried it because i was scard,but.a lots of people said that.
don't blame me if your going to buy a glasses.

It actually doesn't... the first few times you try this out, it may feel like an eye-strain, but then it's almost relaxing...

[|Cookie|]

Check this out:

Watch out,it's really hurt the eyes.
i didn't tried it because i was scard,but.a lots of people said that.
don't blame me if your going to buy a glasses.

It actually doesn't... the first few times you try this out, it may feel like an eye-strain, but then it's almost relaxing...

Oh,really?
that's good!
but i'm still scard from trying it!

[VirtLands]

(variations of the Hermann Grid above)

"Kajita's chromatic scintillating grid illusion"

In the next,
the upper-left image consists of red parts, but the light-red dots appear to be tinted bluish or to scintillate so. The real color of them is shown at the right side. The lower-right image consists of magenta (red-purple) parts, but the light-magenta dots appear to be tinted bluish or to scintillate so. The real color of them is shown at the left side.
source: http://www.psy.ritsumei.ac.jp/~akitaoka/color10e.html


All white dots appear to be tinted reddish or to scintillate so.


Some technical info on why it happens:
In the Her­mann Grid, the inter­sec­tion that you are look­ing directly at (orange cir­cle) falls onto the fovea, which has very lit­tle lat­eral inhi­bi­tion due to the small recep­tive field and high con­cen­tra­tion of pho­tore­cep­tors. Our per­cep­tion within this area is fairly accu­rate, and we see the area as either white or light gray. In the area within the green cir­cle, the dark and light areas are bal­anced, so no gain adjust­ment is needed, and we see this area as white. At the periph­eral inter­sec­tions (pur­ple cir­cle), most of the recep­tive field is flooded with white light, caus­ing strong lat­eral inhi­bi­tion which results in reduced gain and an area that appears gray.

source http://www.sharpbrains.com/blog/2006/12 ... -illusion/

That's it for today.

[Qloof234]

Check this out:

Ohhh, this looks really cool. I can't cross my eyes at all, though, so the effect is lost on me.

[|Cookie|]

Check this out:

Ohhh, this looks really cool. I can't cross my eyes at all, though, so the effect is lost on me.

Awww,i really want to try it,but i have a glasses and...maybe that will made my eyes bad more!
I must buy the 3D glasses to see it!

[Emerald141]

‎

[StinkerSquad01]

And that kind of picture doesn't work with 3D glasses, you must cross/uncross your eyes.

[|Cookie|]

I guess i made it!
if the 3D made the two pic a one pic.that mean i saw it!
Right?

[Technos72]

They're the same shade, so shut up



But what's the only difference?

[Muzozavr]

One is A, the other is B.

[Dark Drago]

cOOl!
optical illusions are not what you call seeing is believing !

[VirtLands]

They're the same shade, so shut up

Yeah, it's hard to believe, (Technos is right on that.)

A careful analysis reveals that the gray hovers around the 6B6B6B value, for both A and B.



Get "Just Color Picker" here:
http://annystudio.com/software/colorpic ... p-download

[|Cookie|]

The Hermann Grid ::

Thîs one is most maddening,

there is the illusion here that sometimes the white circle intersections
are replaced by dark blobs which appear at random intersections...

"This illusion is characterized by “ghostlike” gray blobs perceived at the
intersections of a white (or light-colored) grid on a black background.
The gray blobs disappear when looking directly at an intersection."

You may be asking yourself, why do these black blobs keep appearing?
Am I seeing things?

The pic dosn't work with me.

[VirtLands]

The pic dosn't work with me.

That's strange, the black/white grid that I posted earlier disappeared.

Oh, well, here is a similar one:



kidkidaaa1 may be the only one immune to its haunting "white-dot" effects...

[Muzozavr]

I had difficulties seeing the last one right now, although usually they always work with me. Once it clicked back, I was no longer able to get rid of the effect.

Seems the more tired you are the longer it takes to work on you...

[LittleZbot]

Hmm. Didn't work on me.

[VirtLands]

I've decȉeded to revive this 7 month old topic, because I found some more illusions.

Take your time watching these, and do tell which ones are your favorites.

So far, all of the following is from the Deviant Art website.

-------------------------------------------------------------------------------------
Post -- PART 1

the following animated art is by authorpsykz. : http://psykz.deviantart.com/

Titled: Do Be Careful


Titled: Five Pointed


Titled: Primordial


Titled: Crack a Few


Titled: Perspective is Key


Titled: theoretical reticle {This one is especially nice.}


Titled: Rebel Art


Titled: Ceil


Titled: death is the only thruthful one

[VirtLands]

------------------------------------------------------------------------------
Post -- PART 2 of psykz's art. http://psykz.deviantart.com/

Titled: Hiero { ...really nice... }


Titled: artifacts


Titled: light


Titled: cosmic interference


Titled: come to life


Titled: alive


Titled: illusion


Title: Rebel Art


Titled: Motion Sickness and Epilepsy


Titled: Akira

--------------------- end of list of psykz's art ----------------------------------


Now here is some optical art by author Smooothe http://smooothe.deviantart.com/

Titled: Flip and Slide


Titled: Psychotica


Titled: Escher's Garage { }

--------------------- end of list of smoothe's art---------------------------------

[llarson]

Eschers Garage XD