Power Peaks (IMAGE) Picower Institute at MIT Caption Measurements of brain wave power while animals waited to see a new image show distinct peaks in the beta frequency band in each region: About 11 Hz in visual cortex V4, 15 Hz in parietal cortex and 19 in prefrontal cortex. Credit Miller Lab/The Picower Institute at MIT Usage Restrictions with credit 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.