Fig. 2.

A. Block structure of full similarity matrix (FSM) based upon an example set with 3 subjects and 2 sets of subject-level components (RZ, a set of ICs produced after two ICA decompositions). In this example, each block shows similarity between 2 pairs of RZs from the same subject or two different subjects. Also, RZ 11–31 indicates inter-subject similarity between RZ 1 of subject 1 and RZ 1 of subject 3. The first digit in 11 is an index to the subject whereas the second is an index to the RZ. Highlighted, on the diagonal blocks indicate similarity within the components of a subject or intra-subject similarity whereas off diagonal ones indicate that between the components of two different subjects. B. RZ 21–31 represents RZ 1 of subject 2 and RZ 1 of subject 3 and has been found to be the global maximum in this example. C. Determine block-wise maxima with highlighting in each block such as RZ 21–11 in row 2 and column 1. Global maximum in this figure has been highlighted in addition.