![]() In this case, the rule makes it so that the more detail an object has, the larger it must be. Although the reason for this is not fully understood, it has to do with the way that your brain tries to ‘make sense’ of visual information: because it does not have all of the information, there are certain rules determined to make the best possible guesses about what is actually there. The Helmholtz illusion is due to something called filled extent – shapes seem bigger when they are filled (in this case, striped) than when they are solid. So you can use this to your advantage to achieve whatever look you like. This is due to something called the Helmholtz illusion – which is that a square made up of vertical lines will actually seem wider and shorter than a square made up of horizontal lines – and a dress with a vertically striped pattern will seem wider and shorter than a dress made of a horizontally striped pattern. How do they catch your eye? The direction of stripes might make you look longer and taller, or could emphasize your curves. Now that you understand a bit about vision, let’s talk about what happens when your brain receives unusual visual information. However, all this processing happens so fast, that you’re not consciously aware of any of it happening. Once your occipital lobe has decoded all of the visual signals, it sends the resulting information to the other areas of the brain, so that you can classify what you see (such as noticing that you’re looking at your room), make note of new information (such as that you see your roommate looking around wildly), and act on it (such as telling her that you see her glasses on the table). One interesting quirk about this signal conduction is that it typically crosses before it reaches the visual area – in most people, the information taken in by their right eye is deciphered by the left half of their brain, and vice versa. The occipital lobe, here shown in pink, is the primary brain center for visual perception. In this area, different elements of the visual signals – such as colors, shapes, lines, and location – are interpreted. They are focused into an area at the back of your head, known as the occipital lobe – which is almost solely reserved for vision. As a result of the difference between rods and cones, you only have color vision in the very center of your visual field – but I bet you’ve never noticed that before!įrom the retina, signals are carried via the optic nerve to the brain. They also have much greater resolution of detail than rods, and are mostly located in the very center of your retina. Rods are sensitive to small amounts of light, and primarily contribute to your ability to see moving objects while cones are sensitive to different wavelengths of light, meaning that they are solely responsible for your ability to see color. The eye refracts emitted light through the lens onto the light-sensitive retina. Your eye takes in light reflected off of objects around you, and uses a lens to focus them onto light-sensitive cells at the back of your eye in a membrane called the retina. To understand why, it’s important to understand some basics about how your eye and brain work together to create your vision. It turns out that what you see might not be at all what you actually get. ![]()
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