Coherence (IMAGE) Stanford University Caption Brain regions that activate together can be measured by coherence, as shown in this diagram. The purple- and blue-colored brain regions have patterns of activity that tend to co-occur and, therefore, have high coherence. For example, when activity in the purple brain region increases, activity in the blue region also increases. In contrast, the blue- and pink-colored brain regions have low coherence; that is, the activity of the blue region is not time-locked to activity of the pink region. Credit Image credit: Rajpreet Chahal Usage Restrictions None 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.