{
  "images": "images/all_images_256.npy",
  "fmri": "fmri/fmri_all_subjects.npz",
  "voxel_counts": "metadata/num_voxels_all_subjects.npy",
  "roi_masks_root": "roi_masks",
  "dinov2_repo": "external_models/dinov2",
  "model_registry": "metadata/encoder_registry.json",
  "subject_indexing_user_api": "1-based: subj01=1, ..., subj08=8"
}