Connectivity
    The Connectivity tab in the Overlay Toolbox
      contains a listing of loaded Connectivity (Dense, Dense Dynamic,
      Parcel,  and Fiber Orientation) files and links. 
      
      URL links (loaded using Open Location... in File Menu)
      to remotely stored files are often used to access large (>30
      GB) connectivity matrix files, loading one row of the matrix at a
      time as needed, rather than having to locally store and load the
      whole 90,000 x 90,000 matrix into memory. 
      
        - Load
              checkboxes toggle on/off data loading from the listed
              connectivity file for identified brainordinates (selected
              by left clicking on surfaces or volumes). If checked, every
                time a brainordinate is selected, data will be
              loaded into memory from that file for that brainordinate,
              regardless of whether it is displayed in any viewing tab.
              For best performance, toggle off connectivity loading for
              files not currently in use. 
          - Layer
                Data-series files support "dynamic connectivity". 
                When a brainordinate is identified, the corresponding
                row to the brainordinate is correlated with all other
                rows in the file to produce a connectivity map displayed
                on the brainordinates.  This dynamic connectivity
                produces the same data as found in a dense connectivity
                file without needing to create the dense connectivity
                file.  Note that dense connectivity files may be
                very large (eg 9 GB).
 
- Copy
                copies the data from the currently loaded matrix row
                (for the currently selected brainordinate) and creates a
                new *.dscalar file containing this map data. The new
                file(s) created this way will appear and can be saved
                (and renamed, if desired) in the Save/Manage
                      Files Dialog. 
            - Connectivity File
                    lists links or paths to loaded dense or
                  parcellated connectivity matrix files. For dMRI-based
                  tractography connectivity (trajectory or *.traj*)
                  files, an associated Fiber Orientation File
                  must also be loaded for display and is listed to the
                  right.
 
 
