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( 1920 ). In addition to the processing put forward by G. E. Müller,
Schjelderup postulated a stage of colour processing in the cortex where
six independent physiological processes (red-, yellow-, green-, blue-,
white- and black-related processes) operated. By further assuming
that each of these independent chromatic processes of the cortex
could be lacking or non-functioning, he held that he could explain
the different types of colour-blindness better than G. E. Müller (see
Schjelderup, 1920 ).
Even though the speculations of G. E. Müller did not provide
important new information about colour processing, they revealed
the lack of factual knowledge available and, thereby, stressed the need
for the development of new instruments and techniques designed to
map the anatomical details of neural elements, and to monitor actual
biochemical and physiological processes. The next developmental
period of the duplicity theory from 1930-1966 met this need.
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