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No-Brainer? Mouse Eyes React To Light Without Link To Brain

No-Brainer? Mouse Eyes React To Light Without Link To Brain
No-Brainer? Mouse Eyes React To Light Without Link To Brain

Neuroscientists at Johns Hopkins Medicine report evidence that the eye’s iris in many lower mammals directly senses light and causes the pupil to constrict without involving the brain. The researchers observed that  the pupils in a mouse’s eyes get smaller when the animal is moved from a dark to a lit room even when the nerve connections between the animal’s brain and eyes are severed.