Mechanisms of Seeing: Feynman's Physics Explained
The eye is far more than a camera; the retina is part of the brain, and a great deal of computation happens there before any signal leaves the eye. Retinal nerve cells are wired to sharpen edges and detect motion. This built-in pre-processing is why we recognize shapes and outlines so well. The study of vision is a beautiful meeting of physics (light), chemistry (pigments), and neuroscience (information processing).
The big idea
Seeing is computation: the retina processes images before the brain does.
Think about it
Why might it help survival for our eyes to be especially good at spotting movement and edges?
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