Brain Organoid Activity Map (IMAGE) Cell Press Caption This activity map generated by multi-electrode arrays reveals how active the brain organoid is--red means very active and black means silent. Credit Muotri Lab/UCTV Usage Restrictions Credit Required. License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.