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A high significant difference could be determined at a time period of 450-600 ms
poststimulus (p<0.02, see table 5 and 6 in the Appendix) for the inner number catego-
ries. Based on a 5% significant level, no significant differences exist when regarding
both conditions as within-subject factor (see table 5 and 6 in the Appendix); neither
for the YES answers nor for the NO answers.
Furthermore, an ERP verification of the extreme categories C-300 and C+300 had
been conducted. Figure 6 presents the ERPs at the CZ electrode for these categories.
A paired t-test for CZ and PZ revealed a significant difference for the C+300 category
(p<0.05, see table 7 in the Appendix). It is obvious that the C+300 category of the
lottery condition is marked by a higher positivity at the centro-parietal electrodes (see
also figure 9 in the Appendix).
Depending on the stimulus event of the colored frame presentation, the ERPs are
not distinguishable, as seen in figure 7. Based on this identical pattern no further sta-
tistical test was deemed necessary.
Fig. 4.
Stimulus-locked ERPs of the inner number stimulus at the CZ electrode for the
YES-answers
Fig. 5.
Stimulus-locked ERPs of the inner number stimulus at the CZ electrode for the
NO-answers
