Abstract

The experiments described in this publication had their start during the Second World War under the direction of Professor Sir Frederick Bartlett at Cambridge. The immediate aim was to compare the various tests that had been devised at one time or another to help in selecting people for such night tasks as required keen night vision. The work gradually turned into a laboratory investigation for studying the outstanding traits of the key tests. When the war came to an end, the research was continued because it was seen to have importance for the theory of human vision in general. In the post-war investigations, special attention was paid to the way in which quantum properties of light might be related to excitation of the retina.