The development of the duplicity theory from 1930–1966 - Duplicity Theory of Vision - page 61

Part II The development of the
duplicity theory from 1930-1966
In this developmental period, profound new knowledge about the
anatomical and neurophysiological properties of the retina emerged
as a result of advances in sophisticated instrumentation and research
techniques. This knowledge greatly influenced the development of
the duplicity theory: it provided an insight into the rod and cone
processes, and also created and paved the way for new ideas of rod
and cone functioning. Outstanding contributions to the development
were provided by Polyak, Hartline, Kuffler and Granit. Using the
Golgi impregnation method, Polyak's investigation of the primate
retina helped to elucidate the extremely complex structure of the
many types of retinal cells and the character of their connections.
Hartline, Kuffler and Granit, using microelectrodes for registration
of the action potential from individual nerve fibres in response
to illumination, increased our knowledge about the relationship
between light stimuli and nerve impulses in the retina.