Experimental Setup (IMAGE) Howard Hughes Medical Institute Caption In a virtual reality tank, scientists could trick zebrafish into feeling like they weren't swimming, even though they were paddling hard. This image shows the experimental setup -- electrodes inserted into the fish larvae measured brain cells' behavior in the virtual reality tank. Credit Ahrens Lab/Janelia Research Campus Usage Restrictions Must use 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.