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DOC: Correct description of --longitudinal behavior #2905

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Dec 7, 2022
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DOC: Correct description of --longitudinal behavior #2905

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7 changes: 3 additions & 4 deletions docs/workflows.rst
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Expand Up @@ -139,10 +139,9 @@ In the case of multiple T1w images (across sessions and/or runs), T1w images are
merged into a single template image using FreeSurfer's `mri_robust_template`_.
This template may be *unbiased*, or equidistant from all source images, or
aligned to the first image (determined lexicographically by session label).
For two images, the additional cost of estimating an unbiased template is
trivial and is the default behavior, but, for greater than two images, the cost
can be a slowdown of an order of magnitude.
Therefore, in the case of three or more images, *fMRIPrep* constructs
For two images, the additional cost of estimating an unbiased template is trivial,
but aligning three or more images is too expensive to justify being the default behavior.
For consistency, in the case of multiple images, *fMRIPrep* constructs
templates aligned to the first image, unless passed the ``--longitudinal``
flag, which forces the estimation of an unbiased template.

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