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in a vegetative state (showing no awareness of their surroundings) are found to have no awareness, yet they are able to sometimes detect covert awareness with neural imaging (fMRI). The presence of awareness is clinically measured by the ability to follow commands either verbally or behaviorally. Awareness was detected by asking participants to imagine hitting a tennis ball and to imagine walking from room to room in their house while in the scanner. Using this technique, a patient

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