What is this analysis method?
This toolbox lets you run Informational Connectivity (IC) on
your own fMRI data. IC brings together Functional Connectivity and
multi-voxel pattern analysis (MVPA) to identify brain regions that
have synchronized changes in multi-voxel pattern discriminability
across the timeseries.
A seed region's MVP discriminability is first calculated for every
time-point, producing a timeseries of values reflecting the ebb and
flow of multi-voxel information. The equivalent timeseries of MVP
discriminability is then calculated for other regions (either
pre-specified or through an exploratory searchlight). Just as
Functional Connectivity can be measured by correlating regions'
activation levels over time, Informational Connectivity is calculated
by correlating the changing levels of MVP discriminability across
time, allowing investigators to discover networks of brain regions
that share synchronized multi-voxel pattern decoding.
The method is described with full details in Coutanche
& Thompson-Schill (2013).
What do I need?
1) The absolute minimum requirement is to have
Matlab installed.
2) If you don't already have your data inside Matlab, you should also
install the free (and excellent) Princeton
MVPA Toolbox, which includes tools for bringing fMRI data into
the Matlab environment. The IC Toolbox comes with a script that will
convert any data held inside the Princeton toolbox to the right format
for IC.
How do I run it?
Most people will probably want to first run 'import_from_mvpa_toolbox'
to get their data ready, and then 'exploratory_IC' or 'run_ROI_IC' for
the actual analysis.
Type: "help import_from_mvpa_toolbox", "help run_exploratory_IC" or
"help run_ROI_IC" for details on each script.