Probe (No Reward) (VIDEO) Johns Hopkins University This video is under embargo. Please login to access this video. To view this video please enable JavaScript, and consider upgrading to a web browser that supports HTML5 video Caption On this early day in learning, researchers then played the same 'target' and 'foil' tones but without a lick tube present. Surprisingly, mice licked to the target tone and not to the foil tone with >90% accuracy. Credit The Johns Hopkins University/Kuchibhotla Lab 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.