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Nature 446, 355 (22 March 2007) | doi:10.1038/446355a; Published online 21 March 2007

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Looking for hidden signs of consciousness

Kerri Smith

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A 'brain-activity' test for patients in a vegetative state has divided neurologists.

Can brain-injured patients who show no response to their surroundings ever be considered conscious? This question became a hot topic last year after researchers who scanned the brain of a woman diagnosed as being in a vegetative state found that she could perform certain mental tasks on request.