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.
