temporal ICA instead of GSR

[jcrdubois]

We should implement this
temporal ICA approach as an alternative to GSR

[paola-g]

The presented approach follows these steps:

1. Data are cleaned using ICA-FIX and then MSMAll aligned
2. A dimensionality reduction step is performed with a group spatial ICA (sICA) with 137 components (probably a method is needed to estimate this dimensionality on new data)
3. Individual sICA components are created using weighted spatial regression (where weights are a measure of alignment quality)
4. Temporal ICA is performed on the concatenated individual sICA component time-courses (using FAST-ICA)
5. The number of temporal components is computed with ICASSO

The code for points 1. to 3. should be part of the HCPpipelines, see especially MSMregression.m.

FAST-ICA and ICASSO are implemented in MATLAB.

So far I haven't found any code that puts everything together.