![]() ![]() “Different atoms and molecules emit photons of different wavelengths, which is why we see different colors,” reported Hanneke Weitering for Science Line in 2014. Researchers suspect other parts of the eye also generate biophotons, since phosphenes are known to originate in different parts of the visual system and can even be induced artificially by taking drugs, or by applying pressure, or electrical stimulation. Therefore, our optic nerve continues to transmit the stimulation, and our brain continues to unscramble it and label it as ‘real’ or as fake - a phosphene. But our retinas aren’t equipped to distinguish foreign, open-eyed light from biophotonic, closed-eyed light. Now, research suggests that retinal noise occurs not in response to zero light, but rather in response to a very specific type of light - self-generated light.īiophotonic light is the kind of light generated by fireflies, glow-in-the-dark deep-sea creatures - and our own retinas when our eyes are closed. But while people who have been blind since birth (whole-system failure) do not experience phosphenes, people who lost their vision from a disease or accident (partial-system failure) still can, suggesting something else is at play. Scientists used to think phosphenes were our brain’s attempt to make sense out of lightless stimulation. What Are Those Butterflies in Your Stomach? The retina is the layer of light-sensitive cells at the back of the eyeball it records stimuli and transmits impulses through the optic nerve to the brain, which compiles them into a visual image. In the same way, our retinas remain fully functional even with our eyes closed. It’s still recording and storing away minutes and hours of data - it’s just not very interesting data. You can think of your visual system, when your eyes are closed, like a recording camera with the lens cap on. It can change shades of gray, and it can be interrupted by phosphenes. For instance, the black ink of text might appear darker than eigengrau because the whiteness of the page provides the contrast the eyes need to understand black.īut eigengrau is not a static color. This is because light provides the contrast necessary to perceive darker-ness. Eigengrau is a German term that roughly translates to ‘intrinsic gray’ or ‘own gray.’ When deprived of light - as in when our eyes are closed, or when we are in darkness with our eyes open - we are unable to perceive true blackness, and rather, perceive eigengrau. The color black is often referred to as the absence of light, but when it comes to the human visual system, eigengrau is the color perceived in the absence of light. Let’s start with the almost-black background. It’s a phenomenon called phosphene, and it boils down to this: Our visual system - eyes and brains - don’t shut off when denied light. Welcome back! What’s the first thing you saw? Most people see splashes of colors and flashes of light on a not-quite-jet-black background when their eyes are closed. ![]()
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