"Schizophrenia and bipolar disorder are very hard to diagnose because no particular part of the brain goes off. Key Takeaways Scientists used brain organoids—simplified, lab-grown versions of real organs—to study neurological misfirings that could be associated with schizophrenia and bipolar disorder. In the future, brain organoids could be used to help test drug concentrations that might work on patients. Distinct features of the organoids' brain-like activity served as biomarkers of schizophrenia and bipolar disorder, helping the team spot which organoids came from patients with those conditions with an accuracy of 83%. The setup helped them streamline data as if it came from a tiny electroencephalogram, or EEG, which doctors use to measure patients' brain activity.