The Hermann Grid Illusion—Tricks the Eye
Ludimar Hermann, a German speech scientist and physiologist, noticed something extraordinary taking place before his eyes. He was quick to announce his discovery, and people were quick to listen. After the Hermann Grid illusion became known worldwide, people began to try it. The newly discovered optical illusion left people amazed, as they saw grey dots appear randomly in the white spaces left between the tiny black, square shaped boxes.
What amazed them further about the Hermann grid illusion was knowing that the grey dots they were seeing were not actually there, but their mind somehow had constructed them in their head, making them see the grey dots. The mind was up to no good, tricking the eye into seeing things that were clearly not there because when they concentrated on a white space, the grey dot vanished, just as a ghost would vanish when you catch them off guard.
What Spell Did the Hermann Grid Illusion Cast on You?
Lateral inhibition is responsible for the fading in and out grey dots in the optical illusion. More than one receptor is involved in tricking your receptive field to seeing the unseen. The receptive field is found at the intersection of the cross.
It has an increased amount of light focused on its inhibitory than the receptive field in the middle of the small black squares. This results in the response on the excitatory center of the receptive field to become stronger versus the intersection where the white cross intersects. In short, you see grey dots in your peripheral vision, even when you focus on one single white space.
So, What is the Trick?
There is no trick, just your mind playing games with you. If you do not believe it, you can stand up, move away from the computer, and watch the optical illusion. What do you see? You should be seeing grey dots even at your distance.
The Hermann grid illusion was and is still a magnificent discovery. It messes with your head in the most amazing ways. It lets you perceive images that are not there. If you have never seen a Hermann grid illusion, look at it now. Trick your mind, and then introduce others to it to trick their mind.
Do not stare at the optical illusion too long, as it makes you feel as if you are cross-eyed.