Before revision: Teuber and, in general, the idea of a separate representation of movement was not accepted until physiological studies in the monkey demonstrated the existence of an area in which almost all cells were selective for directional motion.
After revision: Teuber and, in general, such an idea was not accepted until physiological studies in the monkey demonstrated the existence of a cortical area lying outside the primary visual cortex (area V1) in which almost all cells were selective for directional motion.