Molyneux’s Problem: thought experiment from 1688 solved in 2003

Q: If a man born blind can feel the differences between shapes such as spheres and cubes, could he, if his sight was restored, distinguish those objects by sight (without touching them)?

A: No. Huh. “Although after restoration of sight, the subjects could distinguish between objects visually almost as effectively as they would do by touch alone, they were unable to form the connection between an object perceived using the two different senses. The correlation was barely better than if the subjects had guessed. They had no innate ability to transfer their tactile shape knowledge to the visual domain.”

“Ostrovsky, et al studied a woman who gained sight at the age of 12 when she underwent surgery for dense bilateral congenital cataracts. They report that the subject could recognize family members by sight six months after surgery, but took up to a year to recognize most household objects purely by sight.” Wikipedia article

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