Using ICA in BVA

Instructions on how to use the ICA transformation can be found in section 12.3.1 in the BVA Manual.

Though the instructions describe all of the different features and settings of the ICA transformation, it doesn't do as great of a job instructing the best way to use ICA in an everyday analysis setting. This is what we've discovered about the ICA transformation that is not well described in the manual:

• Filter, interpolate bad channels, and artifact reject before applying using ICA. This is important because you want to eliminate as much noise as possible prior to ICA. We've found that rather than segmenting and performing artifact rejection, it's better to put markers in for beginning and end points of "clean" data sections and then applying the ICA over only the clean portions - otherwise, the ICA analysis will take a very long time. Therefore, a good process would be to 1) Filter, 2) Interpolate bad channels, 3) Add cleaning markers, and then 4) use ICA over clean intervals.