In his book “Incognito: The Secret Lives of the Brain,” David Eagleman discussed aspects of a bizarre, and rare, brain disorder called Anton’s Syndrome in which a stroke renders a person blind – but the person denies their blindness.

“Those with Anton’s Syndrome truly believe they are not blind,” Eagleman explained.  “It is only after bumping into enough furniture and walls that they begin to feel that something is amiss. They are experiencing what they take to be vision, but it is all internally generated. The external data is not getting to the right places because of the stroke, and so their reality is simply that which is generated by the brain, with little attachment to the real world. In this sense, what they experience is no different from dreaming, drug trips, or hallucinations.”

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