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Theodore Meynert, a neurologist of the 19th century, published a large number of papers devoted to the fact that the nerve bundles in the brain are horizontal. The problem arose when his pupil Carl Wernicke found the same beam which saw researchers at Washington University - beam which is vertically in the brain. Meinert denied the existence of the beam and refused to publish anything about it, because in such a case he would have wiped out everything already written on that subject.
As a result, the fiber bundle was partially undiscovered for more than a hundred years. Today it became clear that these fibers play an important role in the processing of visual information by the brain.
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