URL: http://www.nitrc.org/projects/pythagoras/
Proper Citation: Pythagorean Displacement and Motion Regressors (RRID:SCR_002525)
Description: Matlab script that uses the Pythagorean Theorem to calculate head motion and position, while preserving degrees of freedom. The motion parameters output by SPM (rp*.txt) estimate head position relative to the first volume in 3D translation and 3D rotation, which are often entered as a nuisance regressor during individual-level statistics. Regressing the total displacement and relative position can potentially explain more variance in voxel-level BOLD signals that is related to head movement during an fMRI experiment.
Abbreviations: Pythagorean Displacement and Motion Regressors
Resource Type: software resource
Keywords: algorithm, magnetic resonance, matlab, pythagorean theorem, head, motion, position, fmri
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