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Shai Azoulai, V.S. Ramachandran; Blind patients “see” their moving hand in darkness (synesthesia). Journal of Vision 2005;5(8):756. doi: https://doi.org/10.1167/5.8.756.
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A patient who is blind because of damage to the visual pathways was asked to move his hand in front of his eyes in complete darkness. Amazingly he not only felt, but literally saw his hand moving; the converse of experienced movement of phantom limbs induced by visual feedback in mirrors. Normals don't see this because the top-down signals to the visual centers from polymodal cells in parietal and frontal lobes is vetoed by bottom-up nulling signals from the intact visual pathway.
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