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(A) Moderation effect of suicidal ideation (SI) on the Hamilton Rating Scale for Depression (HAM-D) and the frontal alpha asymmetry (FAA) at F7–F8. (B) Severe depressive symptom causes reduced FAA (F7–F8), which reflects reduced alpha power in the left frontal region. This phenomenon was only significant in in patients with major depressive disorder with suicidal ideation (n = 23).
