Biomarkers for mental disorders: EEG frequency bands - Spectral changes in the resting-state EEG


Increase in delta and/or theta: ADHD, schizophrenia, OCD (Obsessive-Compulsive Disorder), depression, bipolar disorder, alcohol addiction.


"Only cases in the lower frequency bands where the dominant result was a decrease, rather than an increase, was for autism (eyes closed) and PTSD/early life stress (eyes open)."



ADHD* and the theta-beta ratio

*Attention-deficit/hyperactivity disorder

Use of the ratio of the theta band (4-7 Hz) to the delta band (13-30 Hz) to assist ADHD diagnosis:
"Neuropsychiatric EEG-Based Assessment Aid for ADHD*" or NEBA System by NEBA Health
Approval of the device by the FDA and identification as "Neuropsychiatric Interpretive Electroencephalograph Assessment Aid"
SapienLabs on the theta-beta ratio:
Discussion on FDA device approval linked to FDA endorsement of the theta-beta ratio