Hermann grid

Hermann grid

T478/0442 Rights Managed

Request low-res file

530 pixels on longest edge, unwatermarked

Request/Download high-res file

Uncompressed file size: 77.3MB

Downloadable file size: 311.4KB

Price image Pricing

Please login to use the price calculator


This image is part of the feature Illusions

Credit: SCIENCE PHOTO LIBRARY

Caption: Hermann grid illusion. The intersections of the white horizontal and vertical lines in this image appear to be grey. But when looked at directly they are clearly white. This is because of the role played by the edge of the retina. Our peripheral vision is designed to prioritise identifying shapes and edges. To this end the brightness of an image on the edge of the retina is diminished when it is not important to shape identification. At the intersections, a lot more of the area is white light compared to elsewhere on the lines, and there is an effect called lateral inhibition. The brightness is dimmed for this area, and we observe it as grey.

Release details: Model release not required. Property release not required.

Keywords: ambiguity, ambiguous, biological, biology, grid, hermann grid, illusory, lateral inhibition, neuroscience, optical illusion, perception, physiological, physiology, psychology, retina, squares, trick, trickery vision, vision, visual, visual trick

Licence fees: A licence fee will be charged for any media (low or high resolution) used in your project.