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Fig. 2.1. Human visual pathways (top view). Visual information travels in separate pathways for each half of the visual field. For example, light entering the eye from the right hemifield reaches the left half of the retina, on the rear surface of each eye. The right hemifield inputs from each eye join at the optic chiasm, and travel to the LGN of the left thalamus, then to primary visual cortex, or area V1, of the left hemisphere. Signals from each eye are kept segregated into different neural layers in the LGN, and are combined in V1. There are also smaller pathways from the optic chiasm and LGN to other subcortical structures, such as the superior colliculus and pulvinar (not shown).