Brain and vision. Artwork of a man's head, brain and eyes seen from above, with arrows (white) showing the 'two streams' hypothesis of visual processing. Sensory input from the left eye travels along the optic nerve to the rear and opposite side of the brain (with the reverse happening for the other eye). The 'two streams' hypothesis states that after the information reaches the visual cortex (pink) in the occipital lobe, there are two paths it can follow. One is the dorsal stream (the 'where' pathway) to the parietal lobe (green). The other is the ventral stream (the 'what' pathway) along the temporal lobe (purple).
Science Photo Library was founded in 1981 by Michael Marten, one of the authors of "Worlds Within Worlds", a book exploring different ways to observe the universe - from electron micrographs, to images of earthrise taken from the Apollo spacecraft. When Marten started receiving requests for the beautiful images in the book, he had an idea of setting up Science Photo Library.
Since then, Science Photo Library has continued to work alongside world acclaimed photographers and the leading science and medical experts to provide a central source of the best science and specialist imagery available. Although the collection started with scientific images, it has grown to encompass all aspects of science and their impact on everyday life.
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