Anatomical Data

The anatomical data were acquired in a dedicated 3T Prisma session (ses-PrismaAnat), including five T1w images and three T2w images at 0.8 mm isotropic. Per subject we provide the averaged T1w and T2w volumes, a brain mask, and a FreeSurfer surface reconstruction.

Averaged T1w, T2w, and Brain Mask

Path: derivatives/anatomical/sub-XX/ses-PrismaAnat/anat/

derivatives/anatomical/
├── dataset_description.json
└── sub-XX/
    └── ses-PrismaAnat/
        └── anat/
            ├── sub-XX_ses-PrismaAnat_space-T1w_T1w.nii.gz
            ├── sub-XX_ses-PrismaAnat_space-T1w_T2w.nii.gz
            ├── sub-XX_ses-PrismaAnat_space-T1w_desc-brain_mask.nii.gz
            ├── sub-XX_ses-PrismaAnat_space-T1w_res-1pt8_T1w.nii.gz
            ├── sub-XX_ses-PrismaAnat_space-T1w_res-1pt8_T2w.nii.gz
            └── sub-XX_ses-PrismaAnat_space-T1w_res-1pt8_desc-brain_mask.nii.gz
            (+ one .json sidecar per .nii.gz)

Each modality is shipped at two resolutions:

• 0.8 mm isotropic (space-T1w_*) — on the FreeSurfer hires conformed grid, acquisition resolution suitable for surface-level work and high-resolution visualisation.

• 1.7778 mm isotropic (space-T1w_res-1pt8_*) — on the same grid as the preprocessed BOLD data (see fMRI Data) and the ROIs (see ROIs), allowing direct overlay without further resampling.

Both versions are in the T1w space of the subject and oriented LAS.

FreeSurfer Reconstruction

Path: derivatives/freesurfer/sub-XX/

FreeSurfer 7.4.1 was run on the averaged T1w with the T2w supplied via -T2 and -T2pial, at the native 0.8 mm resolution (-hires).

derivatives/freesurfer/
├── dataset_description.json
└── sub-XX/
    ├── label/
    ├── mri/
    ├── stats/
    └── surf/

• mri/ — segmentations, normalised volumes, and recon-all intermediates.

• surf/ — standard recon-all surfaces plus per-hemisphere manual flat patches cut by hand and used to produce flatmaps for visualizations.

• label/ — standard FreeSurfer cortical parcellations and exvivo labels.

• stats/ — recon-all per-parcellation summary statistics.

Custom ROI labels (retinotopic maps, category-selective regions) are provided in a dedicated derivative; see ROIs.

The volumes inside derivatives/freesurfer/sub-XX/mri/ follow FreeSurfer’s internal convention (LIA-oriented conformed space), as expected by all FreeSurfer tools. The world-space coordinates are identical to the derivatives/anatomical/ images.