@dr.karanr shows off a mind-boggling optical illusion. The educator, who uses his channel to share incredible facts about science and medicine, displays an image of trees with highly vivid purple and orange colours and a black circle in the centre.He says: "Keep staring at the black dot in the middle of the image and I'll explain how your brain lies to you and constantly makes things up."As you keep focusing on the black dot, the cone cells in your retina become desensitised to the colour you can see and tones down the oranges and purples and tones up the colours complementary to these."So when I change the image to black and white, your brain fills in the gaps with these complementary colours to maintain the illusion of normality."The.
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