Brain wars: passion and conflict in the localization of vision in the brain.

David Ferrier and Hermann Munk, both pioneers in early brain research, engaged in a running controversy regarding the primary vision center in the brain. Both misinterpreted their experimental observations, but in different ways. Ferrier placed vision in the parietal lobe, Munk in the occipital lobe, However, Munk also felt he had observed a 'psychic blindness' in his animals, which was in reality only a central scotoma or other primary vision defect, and not the impairment of higher visual capacities that he proposed. Munk's concept has been repeatedly cited as the experimental correlate of visual agnosia, but is inherently fallacious.