- Posted by Marie Kelly
- On June 28, 2017
The brain has two hemispheres, each divided into four lobes. Each lobe is responsible for different functions. For instance the frontal cortex (in blue below) is responsible for decision making and planning; the temporal lobe (in green) for language and memory; and the parietal lobe (in yellow) for spatial skills. The occipital lobe (in red) is entirely devoted to vision: It is thus the place where visual illusions happen.
One way to understand more about this system is to look at how we can trick it, that is, to look at how the brain reacts to visual illusions.
- Bezold effect
The smaller squares inside the blue and yellow squares are all the same color. They seem different (magenta and orange) because a color is perceived differently depending on its relation to adjacent colors (here blue or yellow depending on the outer square)..
- How many legs does this elephant have?
Tricky, isn’t it?! This picture is an impossible picture that also contains some subjective contours, such as the Kanizsa Triangle below: A white triangle (pointing down) can be seen in this figure even though no triangle is actually drawn. This effect is known as a subjective or illusory contour. The contour of the triangle is created by the shapes around it.
- Can you see a baby?
Another great example of an illusory contour! The baby’s head is on the left, the baby’s feet are against the trunk of the tree on the right and hand holding the tree branch..