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Summary: defined. We selected the sites in frontal areas (Fs) for the CNV. As the
P300 component was largely distributed, we pooled the electrodes per
areas (AFs, Fs, Cs, Ps, and Ts). As we noted lateralized effects in the
distribution of these components, we focused on lateralized sites.
Results
Behavioural data. ANOVA on correct detection with Condition (1-
back, 2-back, and 3-back) as a within-subject factor and Group (MCI,
Elderly Controls, Young) as between-subject factor showed a Group
effect(p = .027).Post-hocanalysisindicatedthatMCIandoldersubjects
tended to perform worse than young subjects (p = .07 and p = .06, re-
spectively), but did not differ from each other. The Condition effect
(p = .001) indicated that performance decreased with increasing load
for all subject groups. The Group by condition interaction was not
significant.
Electrophysiological data. On the P300 amplitude, the ANOVA
with Condition (1-back, 2-back, and 3-back), Areas (Afs, Fs, Cs, Ps,
and Ts), Hemispheres (2) as repeated factors, and with Groups (MCI,
Control old, and Young) as the between-subject factor showed a
Condition by Group interaction (p = .021). The post-hoc analysis in-
dicated that the young subjects showed greater activity (i.e., larger
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