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The primary visual cortex of higher mammals is known to carry out two main functions. The inputs from the lateral geniculate body are regrouped in such a way that line segments in specific orientations become the most effective stimuli (Hubel and Wiesel 1959), and it is here that one finds the first important convergence of signals from the two eyes (Hubel and Wiesel 1962).
Hubel et al. (1976) studied this question.