In 1963, David Hubel and Torsten Wiesel, discovered that cats that had one eye sewn shut from birth to three months of age only developed full vision in the open eye (1), and that monocular deprivation caused permanent electrophysiological and anatomical changes in the cats’ brains. Sewing the eye closed after three months of age did not have this effect, so the immediate postnatal three months was named the “critical period” for vision development.
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