Tennis (IMAGE) German Sport University Caption Those sudden tantrums displayed on court by former US tennis player John McEnroe are legendary - but so too are those of Nick Kyrgios, Alexander Zverev, Serena Williams and Co. And their tennis rackets certainly bear witness to that! Emotions and nonverbal movement behaviour are closely linked processes. Up till now however, there has been insufficient knowledge about the spontaneous nonverbal expressions in response to the experience of positive and negative emotions, i.e. when winning or losing a sports competition. Credit German Sport University 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.