The perception of the image given to the brain doesn’t measure up. All three types of illusions have one common thread. There are three main types of optical illusions including literal illusions, physiological illusions and cognitive illusions. It was either a young girl or an old woman. The figure you saw was determined by your perception. Hill embraced the phenomena of optical illusions by skillfully sketching a picture that was simultaneously two images. By the 19 th century, a famous cartoonist W.E. Greek philosophers like Plato described them as tricks played on us by our senses and our minds. The fascination with optical illusions has spanned the globe for centuries.

Or are they? This is called an optical illusion. Once in a while your eyes are capable of tricking your brain into seeing things that aren’t really as they appear. You would think it always reigns supreme, but sometimes it doesn’t. Plus, your brain controls your entire nervous system. Yes, your brain is the original Photoshop genius. Your brain flips them, so you see images right side up and reversed. Your eyes work in constant unison with your brain, which is why you see the world as you do.įor example, the retinas in your eyes – the layer where visual images are formed – actually “sees” images upside down and backwards. If you take a step beyond the interesting stories your eyes tell, you will discover how they actually work.

Did you know if you have blue eyes, you share an ancestor with all other blue-eyed people on the planet? That’s because blue eyes are a genetic mutation that appeared more than 6,000 years ago.

Deja vu psychology definition quizlet