Correlation between the patients with depression and healthy participants. The first section summarizes the correlation with the serotonin content in platelet, the second section shows the correlations between cortical LDAEP, STAI-X1, BDI-II, and source LDAEP and the lowest section contains the correlation of the source LDAEP. Results reported are Pearson correlation coefficient r with significant correlations printed in bold and * indicating results with * p < 0.05, ** p < 0.01 and representing *** p < 0.001. The correlations within the self-questionnaires are not shown.