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In the first step of the first level, the data matrix for a cortical field in one subject, B2j, is transformed to be in optimal alignment with the same cortical field in another subject’s brain, B1j, referred to here as the reference subject: argmin||B2jR2j(level1)−B1j||F(5) We use the Procrustes transformation to find the orthogonal matrix that affords the optimal improper rotation to achieve this minimization [46].
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