In the filaments, the same cross-sectional pattern of holes is preserved, but on a microscopic scale.

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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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The cross-sectional study, published by the Indian Journal of Community Medicine three years ago, recruited 200 medical students and scholars.

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They use ultrasound to take a series of cross-sectional pictures of a possible tumour (they concentrate at the moment on breasts, ovaries and prostate glands).

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An international team of researchers carried out simultaneous cross-sectional studies for three student populations (roughly grade 4, grade 8, and students in final year of secondary school) and assessed nearly half a million students in 41 countries.

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