Figure 5
Bootstrap analysis of variability in ICA decompositions from single
subjects and subject subgroups. Plot shows rank-ordered correlation
coefficients between the time course in all 25 conditions of
component N1aR (from the grand average decomposition) and (thin
traces) the time course of the most highly-correlated independent
component derived from separate training on each of the 20 subjects'
data, or (thick lines) on averages of data from 200 randomly-selected
subgroups of 4 subjects. The top two traces show correlations
between ERPs in the time range -100 msec to 400 msec. As a control,
data from a later portion of the same response epochs (400 msec to
900 msec post-stimulus onset) were used to derive ICA components,
and the resulting component projections were correlated with the
same grand-mean N1aR projection (lower traces) Note that nearly
all the control correlations fall below the dashed lines that give
the p=0.05 confidence levels in the single-subject and subject
subgroup control data results.
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