Psychiatric researchers are currently exploring possible biomarkers not just for depression but for mental health conditions as diverse as anxiety, PTSD, eating disorders, bipolar disorder, substance use disorders, autism, schizophrenia, and suicidality. Candidates include the presence or absence of specific genes and variants, levels of specific inflammatory molecules, the strength of various signals measured on EEGs, connectivity patterns in functional brain circuits seen in brain imaging, activity patterns of specific brain structures such as the amygdala detectable through brain imaging, and more.