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Thinking during tasks shows up in color in cross-sectional images, recorded as the subject lies with his head inside the scanner.
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Now they have something that works like a flatbed document scanner, with a scanning head containing either six or 12 light-emitting diodes, each emitting light of a specific wavelength between 350 nanometres (ultraviolet) and 800 nanometres (infra-red).
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Rather than a big scanner, it involves a cap worn on a person's head.
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