Nice colour illusion
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Pestcontrol
In Cryo Sleep
Amazing. I've found the colour comes back a little if i move my eyes back to the dot.
E
elDiablo
Guest
Ok, so that's pretty damn awesome!
Pestcontrol
In Cryo Sleep
I think the first image is a negative chroma signal (colour information but no brightness information), this leaves a positive imprint in your eye (or brain), it's like when you look at a bright lamp and you see an imprint of it in your vision, only more subtle. Then when you move your mouse the image swaps to the luma (brightness, ie: b&w) signal, giving the perception of a full colour image.
Just guessing..
Just guessing..
that's the basics, yes.
What happens is called sensory adaptadion. Generally, sensory organs adapt to a repeated stimulus by decreasing response to it.
Sensory adaptation is a way of "filtering out" stimuli that are constant. From the first level of processing, our nervous system "pays more attention" to changing stimuli than to constant stimuli. For example, you feel your clothes when you put them on in the morning (socks, for example), but for most of the day you're not even aware of them (part of it has to do with attention, but your nerves also adapt).
In the eye, it works something like this (according to current science, that is ):
Information about colour and about intensity of light is sorted into three "channels." The channels consist of axon pathways from retinal ganglion cells. The retinal ganglion cells recieve all colour information from the cones in the retina (cones are the specialized colour receptor cells in the eye, and there are three "kinds" - red, green, and blue).
Two of these channels carry colour or wavelength information, and one carries intensity & saturation information.
One of the two colour channels responds to red or to green light: here, certain ganglion cells will fire signals if stimulated by red light (messages sent by red cones) and will decrease firing if they get signals from green cones; other ganglion cells do the opposite. In the other channel, blue-yellow ganglion cells work the same way. The intensity/saturation channel also works in a similar manner: here, the sum of red, green, and blue cone input results in different ganglion cells detecting black, white, or shades of gray (as we all know, if all the colours of the visible spectrum are summed, they appear white).
Each ganglion cell receives input from a defined set of cones, and when a ganglion cell gets the necessary signal combination to activate it, it sends a message that indicates a particular colour. Thus, a "blue" ganglion cell, one that only signals "blue" to the brain, fires a message when it receives input from blue cones but no input from green or red cones. A "yellow" ganglion cell sends its "yellow" message to the brain when activated by a certain pattern from green and red cones, but no messages from blue cones. Remember that while yellow is signaled by activation of both red and green cones, the message "yellow" travels in the same pathway, or nerve fiber bundle, as the message "blue," and these two (yellow and blue) cannot travel at the same time, so we do not see "blue-yellow." The messages "red" and "green" are sent by different ganglion cells from those that send "yellow," even though all these are receiving information from (different) red and green cones. Because red and yellow are transmitted in separate channels, we can simultaneously see red and yellow (orange), and for the same reason, we can see red and blue (magenta), blue and green (aqua) and yellow and green (lime).
...SO, what happens is this: When you look at the inverted colours in the picture, your cones adapt to it by decreasing their firing frequency. Then, when you move the mouse over the image and change it to the black & white one, the adapted cones can't fire for a while (it takes a while to re/un-adapt - think about what happens when you step into a brightly lit area after being in a dark one for a while), and in turn, the ganglion cells connected to these cones decrease their firing. The cones of the inverted colour (of the inverted image, that is) however, are not adapted, and fire as usual.
For a colour channel to transmit "white" to the brain, the signals from the ganglion cells of the opposing colours must fire equally strong. What happens here is that where you should be seeing "white", you instead see the inversion of the colour that you adapted to.
there
Easy, yes?
What happens is called sensory adaptadion. Generally, sensory organs adapt to a repeated stimulus by decreasing response to it.
Sensory adaptation is a way of "filtering out" stimuli that are constant. From the first level of processing, our nervous system "pays more attention" to changing stimuli than to constant stimuli. For example, you feel your clothes when you put them on in the morning (socks, for example), but for most of the day you're not even aware of them (part of it has to do with attention, but your nerves also adapt).
In the eye, it works something like this (according to current science, that is
): Information about colour and about intensity of light is sorted into three "channels." The channels consist of axon pathways from retinal ganglion cells. The retinal ganglion cells recieve all colour information from the cones in the retina (cones are the specialized colour receptor cells in the eye, and there are three "kinds" - red, green, and blue).
Two of these channels carry colour or wavelength information, and one carries intensity & saturation information.
One of the two colour channels responds to red or to green light: here, certain ganglion cells will fire signals if stimulated by red light (messages sent by red cones) and will decrease firing if they get signals from green cones; other ganglion cells do the opposite. In the other channel, blue-yellow ganglion cells work the same way. The intensity/saturation channel also works in a similar manner: here, the sum of red, green, and blue cone input results in different ganglion cells detecting black, white, or shades of gray (as we all know, if all the colours of the visible spectrum are summed, they appear white).
Each ganglion cell receives input from a defined set of cones, and when a ganglion cell gets the necessary signal combination to activate it, it sends a message that indicates a particular colour. Thus, a "blue" ganglion cell, one that only signals "blue" to the brain, fires a message when it receives input from blue cones but no input from green or red cones. A "yellow" ganglion cell sends its "yellow" message to the brain when activated by a certain pattern from green and red cones, but no messages from blue cones. Remember that while yellow is signaled by activation of both red and green cones, the message "yellow" travels in the same pathway, or nerve fiber bundle, as the message "blue," and these two (yellow and blue) cannot travel at the same time, so we do not see "blue-yellow." The messages "red" and "green" are sent by different ganglion cells from those that send "yellow," even though all these are receiving information from (different) red and green cones. Because red and yellow are transmitted in separate channels, we can simultaneously see red and yellow (orange), and for the same reason, we can see red and blue (magenta), blue and green (aqua) and yellow and green (lime).
...SO, what happens is this: When you look at the inverted colours in the picture, your cones adapt to it by decreasing their firing frequency. Then, when you move the mouse over the image and change it to the black & white one, the adapted cones can't fire for a while (it takes a while to re/un-adapt - think about what happens when you step into a brightly lit area after being in a dark one for a while), and in turn, the ganglion cells connected to these cones decrease their firing. The cones of the inverted colour (of the inverted image, that is) however, are not adapted, and fire as usual.
For a colour channel to transmit "white" to the brain, the signals from the ganglion cells of the opposing colours must fire equally strong. What happens here is that where you should be seeing "white", you instead see the inversion of the colour that you adapted to.
there
Easy, yes?
