Fig. 5.

Correlation estimate (true value r = 0.5) changes with increasing numbers of non-informative voxels. This makes it impossible to compare correlations across different regions. The graph shows the difference between sample correlation for same and different finger (dark gray dashed line) and the correlation between the patterns after subtracting the corresponding condition mean (light gray). The corrected estimate from the pattern-component model (black dashed) remains valid, even if 75% of the voxels in the studied regions are uninformative.