ICA


The ICA algorithm chosen is an user-specified parameter (See Setup ICA). Depending upon the algorithm chosen, ICA options window pops up showing the options available to that algorithm. For explanation of some of the algorithms implemented in GIFT and how ICA options effect the ICA process see section 3.2 in the manual.

The reduced data-set from the data reduction step is used and ICA is applied to reveal independent components. The components (see Figure 1) represent group components.

Figure 1: ICA applied on reduced data-set of the group

Calculation involved in ICA step:

After the ICA algorithm is applied in GIFT, weights and activations are stored for future use in back reconstruction step. These are stored in .mat files with suffix as '_ica'.