Seeing without light

The brain can ‘see’ some things — even in complete darkness

By Stephen Ornes, 10:59 AM November 20, 2013

Spelunkers who explore caves often say they can see their hands move in the dark. A new study suggests those cavers aren’t hallucinating. It finds evidence that the brain sometimes creates visual “images” without input from the eyes.

The study based its conclusion on an experiment anyone can try. Find a dark place or put on a blindfold. (Or visit the nearest, darkest cave.) Next, wave your hands in front of your face. Did you see them?

Many people can, researchers report in a study published Oc...

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