**3.10 Frontal alpha asymmetry in the subject with the lowest "depressed" score**

F8–F7 fAA in the subject with the lowest "depressed" score shows F8 voltage 1 standard deviation below normal (coded blue) combined with F7 voltage 1 standard deviation below normal (coded red). Normal in this map is shown for the theta voltage at recording sites T4–T3 wherein both voltages are less than 1 standard deviation from each other, considered equal or even asymmetry. It is noteworthy that the F8–F7 voltages for this subject with the lowest "depressed" ISI score are reverse of those in the subject with the highest "depressed" score. This pattern is indicative of right-sided *Quantitative Electroencephalography for Probing Cognitive and Behavioral Functions… DOI: http://dx.doi.org/10.5772/intechopen.107483*

#### **Figure 3.**

*qEEG symmetry maps for the subjects with the highest and lowest "depressed" ISI scores. Green circles joined by horizontal lines indicate the symmetrical homologous right and left scalp recording sites where the voltages are* ≤*0.5 μV (EVN = even) for each of the standard delta (1–3 Hz), theta (4–7 Hz), alpha (8–12 Hz), and beta (15–20 Hz) EEG bandwidths. Blue (LO = low) and red (HI = high) circles joined by horizontal red lines (UVN = uneven) indicate the recording sites where the voltages are >0.5 μV lower and higher than the symmetrical homologous site, respectively. Upper panel: eyes-closed map recorded on the same day as completion of the Individualized Self Inventory (ISI) for the subject with the highest "depressed" ISI score. Lower panel: eyes-closed map recorded on the same day as completion of the ISI for the subject with the lowest "depressed" score. The highest and lowest "depressed" ISI scores are indicative of increased and decreased negative perceptions of a person's psychosocial interactions, respectively.*

fAA in the subject with the highest "depressed" score and left-sided fAA in the subject with the lowest "depressed" score.
