What the frog's eye tells the frog's brain

Authors: 

J. Y. Lettvin , H. R. Maturana , W. S. McCulloch & W. H. Pitts (Proceedings of the IRE, 1959)

J. Y. Lettvin , H. R. Maturana , W. S. McCulloch & W. H. Pitts (Proceedings of the IRE, 1959)

DOI: 10.1109/JRPROC.1959.287207

Comments: 

The authors found that there are four distinct parallel distributed channels whereby the frog's eye informs his brain about the visual image in terms of local pattern independent of average illumination.

Suggested by: 

F. Protopapa