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Optical Illusion

posted before, but deserving a repost for those who haven't seen it.

but the second one is DEFINITELY better. i really didn't see that boat for a while.
 
The letters A and B are the same...is that what they mean?

maybe it's just this laptop screen. If I tilt the screen way back I can see the background of those squares is the same color.
 
Originally posted by: z0mb13
heh how is it square A and B the same shade??? isnt it different??
Click to expand...

Photoshop tells me they are both 107,107,107 so I kind of have to say that they are equal.
 
There are two visual-perception effects that cause you to perceive the two squares to be different shades.

Lateral inhibition, an artifact of the eyes retinal nerve design which aids in edge detection, causes the tone delta to be amplified, making the dark square appear darker.

Contrast effects are the result of you visual cortex trying to maintain color constancy. Basically, its as if, the brain uses the fact that there is a shadow to infer that the actual tone of the light square is lighter than it appears (i.e., the brain adjusts the perceived tone based on the overall lighting effects.)

 
Originally posted by: yamahaXS
There are two visual-perception effects that cause you to perceive the two squares to be different shades.

Lateral inhibition, an artifact of the eyes retinal nerve design which aids in edge detection, causes the tone delta to be amplified, making the dark square appear darker.

Contrast effects are the result of you visual cortex trying to maintain color constancy. Basically, its as if, the brain uses the fact that there is a shadow to infer that the actual tone of the light square is lighter than it appears (i.e., the brain adjusts the perceived tone based on the overall lighting effects.)
Click to expand...

So does that mean it would be possible to train yourself to see them as both the same shade? At least, in the latter case?
 
Originally posted by: Eli
Originally posted by: yamahaXS
There are two visual-perception effects that cause you to perceive the two squares to be different shades.

Lateral inhibition, an artifact of the eyes retinal nerve design which aids in edge detection, causes the tone delta to be amplified, making the dark square appear darker.

Contrast effects are the result of you visual cortex trying to maintain color constancy. Basically, its as if, the brain uses the fact that there is a shadow to infer that the actual tone of the light square is lighter than it appears (i.e., the brain adjusts the perceived tone based on the overall lighting effects.)
Click to expand...

So does that mean it would be possible to train yourself to see them as both the same shade? At least, in the latter case?
Click to expand...

Perhaps, by repeated exposure to a virtual environment where tone is not effected by cast shadows. Studies have been done where subjects where glasses that invert the visual field (ceiling b/c the floor, vice versa) and after a relative short period (i think its about 6 hours) the wearer no longer PERCEIVES that the visual field is inverted. The same principle might work for color constancy.

Nothing can be done to reduce the effects of lateral inhibition as it is hardwired into the retinal nerves.
 
Originally posted by: yamahaXS

Perhaps, by repeated exposure to a virtual environment where tone is not effected by cast shadows. Studies have been done where subjects where glasses that invert the visual field (ceiling b/c the floor, vice versa) and after a relative short period (i think its about 6 hours) the wearer no longer PERCEIVES that the visual field is inverted. .
Click to expand...

so if you remove the glasses everything will be inverted again?! :Q
 
Originally posted by: dighn
Originally posted by: yamahaXS

Perhaps, by repeated exposure to a virtual environment where tone is not effected by cast shadows. Studies have been done where subjects where glasses that invert the visual field (ceiling b/c the floor, vice versa) and after a relative short period (i think its about 6 hours) the wearer no longer PERCEIVES that the visual field is inverted. .
Click to expand...

so if you remove the glasses everything will be inverted again?! :Q
Click to expand...

Yep, for another 6-12 hours.
 
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