Researchers (IMAGE) Karolinska Institutet Caption Co-first authors Ioanna Smyrlaki (right) and Anders Ekman (left) and Bjorn Reinius, principal investigator of the study. Credit Stefan Zimmerman 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.