What Causes Hallucinations? [Science Video]

A condition called Charles Bonnet Syndrome can cause blind patients to hallucinate scenes in vivid color. fMRI studies show that these hallucinations activate the same brain area as sight — which is a completely different region from imagination. Other hallucinations also involve the same brain areas as real sensory experiences. What’s going on? Elizabeth Cox details the science of hallucinations.

[TED Ed]