meeting in Special
Collections Room, Cabell Library
Retinal Theory of "Lateral Inhibition"
reviewed for a physiological explanation of this optical
illusion, wherein the same color (brown, in
the Albers plate) appears to be two different
browns. This theory holds that areas of the retina
communicate with each other, prior to sending a signal
to the brain, in order to optimize contrast perception.
Inhibition at University of Indiana
(The significance of this visual development,
along with other aspects of vision, such as night vision,
peripheral vision, and brightness adaptation were discussed
throughout the course.)
Hermann grid illusion
an optical illusion documented by Ludimar Hermann in
characterized by grey areas at the intersections of a white
grid on a black background.
Another effect of the retina transmitting "enhanced"
contrast data to the brain.
Illusions at Shutterstock |
Hermann at Amazon