Scientists settle centuries-old debate on perception

Marlowe Hood reports for PhysOrg:

Researchers said Sunday they had solved a conundrum about human perception that has stumped philosophers and scientists alike since it was first articulated 323 years ago by an Irish politician in a letter to John Locke.

Imagine, William Molyneux wrote to the great British thinker, that a man blind from birth who has learned to identify objects -- a sphere and a cube, for example -- only through his sense of touch is suddenly able to see.

The puzzle, he continued, is "Whether he Could, by his Sight, and before he touch them, know which is the Globe and which the Cube?"

For philosophers of the time, answering "Molyneux's question," as it was known ever after, would resolve a fundamental uncertainty about the human mind.

Empiricists believed that we are born blank slates, and become the sum total of our accumulated experience.

So-called "nativists" countered that our minds are, from the outset, pre-stocked with ideas waiting to be activated by sight, sound and touch.

If a blind man who miraculously recovered his sight could instantly distinguish the cube from the globe it would mean the knowledge was somehow innate, they argued.

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