What good is the “Anatomy Parent” in to3d?
For most purposes, you don’t need to specify an anatomy parent dataset when you create a new dataset. The anatomy parent is the dataset that provides the master transformation when creating “follower” datasets. That is, the anatomy parent is the dataset that is marked and transformed to Talairach coordinates and that corresponds to the alignment of the other datasets for which it is the parent. The transformation from +orig to +tlrc coordinates in the anatomy parent is applied to the other datasets to produce their +tlrc versions – these are the followers. The way that AFNI was intended to be used is that all the datasets from a single scanning session would be stored in a separate directory (a “session directory”). These datasets are presumed to be aligned with one another. When you mark and transform one of them, it is assigned to be the anatomy parent of the other datasets in that directory. Note This Carefully: If you stored datasets from multiple sessions in the same directory, AF
