Name: Your brain on déjà vu
Uploaded: 2015-12-29T23:09:21Z
Duration: 2 min 8 s
Description: Ever experienced déjà vu? CNN's Sanjay Gupta explains what's happening in your brain when it occurs.

US scientists have identified two genes responsible for macular degeneration, the gradual deterioration of eyesight in the elderly that can lead to blindness, a study showed this week.The research published 24 April 2007, in the Journal of the American Medical Association also showed that smoking and being overweight carry a strong risk of the condition, in which the central part of the eye's retina degenerates.

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Your brain on déjà vu

Ever experienced déjà vu? CNN's Sanjay Gupta explains what's happening in your brain when it occurs.

2:08 • Source: CNN

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