Smiley Face Painted on Cement (IMAGE) University of South Australia Caption If we can trick the brain into perceiving stimuli as 'happy', then we can potentially use this mechanism to help boost mental health. Credit Unsplash 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.