Magnetoencephalography biomarkers of suicide attempt history and antidepressant response to ketamine in treatment-resistant major depression

•Ketamine improved dot probe performance for patients with suicide attempt history.•Theta power differences were found in amygdala-hippocampal network for attempters.•Ketamine altered alpha power-ideation score associations in insula and cingulate.•Findings highlight changes in band-limited power between attempters/non-attempers.