## 3 Results
### Analytical Statistics  
The analysis of variance (repeated measures ANOVA), including the within-subject factors _condition_ (four levels: words, number words, digits, non-words) and _electrode_ (six levels: F7, F8, T7, T8, P7, and P8), resulted in significant _condition * electrode_ interactions for three distinguishable time-windows, which are from 219 ms to 251 ms, from 299 ms to 363 ms, and from 427 ms to 587 ms (see Table 2). The conditions for normal distribution (Kolmorgorov-Smirnov and Shapiro-Wilk) and sphericity (Mauchly) were checked. The tests for normal distribution in each group show that the preconditions are fulfilled. The Mauchly test for sphericity is also highly significant (\(p<0.001\)) with Epsilon \(\leq 0.75\). Therefore, a Greenhouse-Geisser correction was applied. The above-mentioned significant interactions (all with medium- to large-size effects) allow for following \(t\)-test calculations comparing each possible pair of stimulus conditions for each electrode location and each time-window. The calculated \(t\)-test results for one representative time point for the earliest time-period from 219 ms to 251 ms post-stimulus are displayed in Table 3. Respective \(t\)-test results for one representative time-point for the second time-period from 299 ms to 363 ms post-stimulus onset are displayed in Table 4. Finally, \(t\)-test results for one representative time-point for the latest time-period from 427 ms to 567 ms post-stimulus onset are displayed in Table 5. What can be seen in Figure 2 as a result of visual inspection is that within the earliest time-period from 219 ms to 251 ms post-stimulus, the largest differences between brain potentials occurs at electrode location P8. This is very well reflected in the \(t\)-test results displayed in Table 3. The stimulus condition _'digits'_ elicited brain potentials that are significantly different from all other stimulus conditions (_words_, _number words_, _non-words_). \begin{table}
\begin{tabular}{c c c c c c c c c} \hline
**Time** & \(p\)**-Value** & **Eta-Square** & **Time** & \(p\)**-Value** & **Eta-Square** & **Time** & \(p\)**-Value** & **Eta-Square** \\ \hline
99 ms & 0.388 & 0.056 & **339 ms** & **0.019** & 0.133 & **579 ms** & **0.050** & 0.112 \\
115 ms & 0.378 & 0.056 & **355 ms** & **0.042** & 0.116 & 595 ms & 0.141 & 0.087 \\
131 ms & 0.433 & 0.051 & 371 ms & 0.348 & 0.059 & 611 ms & 0.228 & 0.074 \\
147 ms & 0.622 & 0.038 & 387 ms & 0.676 & 0.035 & 627 ms & 0.103 & 0.100 \\
163 ms & 0.288 & 0.066 & 403 ms & 0.681 & 0.033 & **643 ms** & **0.039** & 0.122 \\
179 ms & 0.207 & 0.077 & 419 ms & 0.138 & 0.088 & 659 ms & 0.105 & 0.102 \\
195 ms & 0.400 & 0.055 & **435 ms** & **0.015** & 0.144 & 675 ms & 0.156 & 0.087 \\
211 ms & 0.227 & 0.072 & **451 ms** & **0.001** & 0.170 & 691 ms & 0.348 & 0.059 \\
227 ms & **0.006** & 0.160 & **467 ms** & **<0.001** & 0.226 & 707 ms & 0.446 & 0.050 \\
243 ms & **0.021** & 0.137 & **483 ms** & **<0.001** & 0.191 & 723 ms & 0.750 & 0.027 \\
259 ms & 0.132 & 0.090 & **499 ms** & **<0.001** & 0.204 & 739 ms & 0.384 & 0.055 \\
275 ms & 0.802 & 0.026 & **515 ms** & **0.004** & 0.175 & 755 ms & 0.395 & 0.054 \\
291 ms & 0.079 & 0.102 & **531 ms** & **0.003** & 0.168 & 771 ms & 0.669 & 0.032 \\
307 ms & **0.007** & 0.149 & **547 ms** & **0.022** & 0.127 & 787 ms & 0.735 & 0.026 \\
323 ms & **0.048** & 0.114 & **563 ms** & **0.023** & 0.126 & 803 ms & 0.820 & 0.022 \\ \hline \end{tabular}
\end{table} 
Table 2: ANOVA results for single 16 ms time intervals (represented by their mean time points; e.g., 99 ms is the mean time point for the interval from 91 ms to 107 ms post-stimulus onset) spanning from 91 ms to 901 ms post-stimulus onset. All significant _condition * electrode_ interactions, including their respective mean time points, are marked in red colour. Resulting eta-square values related to significant interactions are all medium- to large-size.