![]() ![]() Then afterwards, corrective processes will show a longer lasting negative afterimage with the opposite color. Looking at a bright object like the sun very briefly will also produce a positive afterimage, where you basically see the same image with the same color. We have no clue how this cognitive adaptation works in neurophysiology. Anything less green will be interpreted as more red by corrective signals. One theory is that our brain processes information from rods and cones in an antagonistic manner, where green is the opponent of red for example. There are a lot of theories as to why exactly do we see the opposite color in this optical illusion. ![]() When we close our eyes or look somewhere else with a uniform color, the adaptive correction is still going on even though we don't need it anymore. The weird part is that our occipital lobe tries to correct for the decreased signal by showing the opposite color. But if we stare at an image very steady, the photpigments gets used up completely and there is a reduced signal to the brain. Usually when we see some sort of stimulus for too long, the photo pigments get used up and the eye tries to move it to a different part of the retina by small movements called microsaccades. That's right, it's an optical illusion that relies on a negative afterimage. When the pupils don't sync with each other, that's a sign of optic nerve or oculomotor nerve dysfunction. It is also the purpose of an eye patch back in the day so captains could see below deck. I always do it so that I can see in the dark. ![]() You could also try having someone shine a light in one eye and have them check the other eye for the pupillary light reflex, like how emergency responders do. If you actually check yourself in the mirror after closing one eye, you'll notice that both eyes are equally dilated, but it's tricky because your eyes dilate so fast and you can't really see the mirror in the dark. But those are all perfectly normal responses. Cognitive factors might make perception alternate between the bright eye and the dark eye such that you can only see the dark stimulus or the bright stimulus, but not both (binocular rivalry). There are also other higher level processes like ganglion cell inhibition and other things by nerve control. After the photopigment is bleached (exposed to light), it needs to reset and rod cells (night vision) take a bit longer than cone cells to regenerate their pigments. The process is called dark adaptation by rhodopsin bleaching. To see what fun facts people are finding out look at r/TodayILearned!Ĭheck out r/LifeProTips to pick-up secrets of overcoming everyday problems!įind out what every man should know over at r/EveryManShouldKnow! It is advised that you use the search function in this subreddit or any other technology based subreddit to search for posts containing shortcuts for your OSĩ) Citations are required for YSKs regarding health and science related topics.ġ0) Don't shitpost. YSKs that are spamming websites, products and services will be dealt with at the discretion of the moderators and may result in action against the user posting the YSK.Ĩ) YSKs regarding computer shortcuts are no longer allowed as of June 2, 2014. The post must be a YSK as defined above.Ģ) Within your post you must include "Why YSK" which should have an explicit statement of how it helps people improve on a task, skill, or ability as noted in the 1st Rule (and not your personal story).ģ) YSKs regarding Reddit, Facebook, Twitter or any other social media are NOT ALLOWED.Ĥ) YSKs with referral links to sites such as Dropbox or Amazon are NOT ALLOWED.ĥ) YSKs regarding ideas or concepts based in conspiracy will be removed at the discretion of the moderatorsĦ) YSKs that are a call to arms, which can be asking for support for charities, organizations or political parties WILL NOT BE ALLOWED.ħ) This subreddit is not the place to be self-advertising your websites, products and services. Rulesġ) Your post MUST begin with YSK and have appropriate flair. Look here for some thoughts about difference between a YSK and a TIL. YSKs are about self-improvement on how to do things, not for facts and figures, which is what /r/TodayILearned is for. A community to share tips and tricks that will help yourself improve on activities, skills and various other tasks. ![]()
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