5.1.7. AFNI GUI: Chooser menu¶

Dataset Chooser ¶

Open chooser window
Click the `UnderLay` or `OverLay` button to open a dataset chooser window.

The dialog window will indicate Underlay or Overlay coresponding to which button you clicked.
The chooser will list the datasets available in the current directory.
By default when you start afni, it will automatically load the first dataset alphabetically and that will be selected in your chooser menu. (You can set the AFNI_START_SMALL environment variable to YES which will default to loading the dataset with the smallest file size first for speed)
The left column has prefix names of datasets.
- Datasets without an extension are in afni’s .BRIK and .HEAD format.
- NIFTI formatted dataset will show the .nii or .nii.gz extension.
The right column has a little information about each dataset.
- How dataset was classified when it was created. Usually from to3d, dcm2nii_afni, dimon, etc..
- Number of sub-bricks.
- The * indicates that the dataset can be graphed (see here).
- The z at the end indicates that the dataset is compressed.
In this example:
- FT_anat is an anatomical bucket dataset with 1 sub-brick and is in uncompressed afni format.
- The next 3 datasets are eco-planar (EPI) datasets with 152 sub-bricks (TRs) in uncompressed afni format.
- The next 2 datasets are eco-planar (EPI) datasets with 152 sub-bricks (TRs) in NIFTI format. One uncompressed the other compressed.

Click on label, or scroll with mouse scroll-wheel, use keyboard, arrows, or click the Index up / down arrows.
Press Apply button to select the highlighted dataset, and also keep the chooser window open.
Press Set button to select the highlighted dataset, and also close the chooser window.
Set environment variable AFNI_DATASET_BROWSE to YES to have AFNI switch to that dataset immediately upon selection (don’t need to use Apply or Set).
Environment variables can be set in your .afnirc file, or by using the Edit Environment control panel (cf. Define Datamode ⇒ Misc).
- See here for the datamode panel.
- See here for the list of all AFNI environment variables.

Starting	Main controller	Image window	Graph window
Overlay panel	Datamode panel	Chooser menu	Maps