Electronic tongue device (IMAGE) Penn State Caption The electronic tongue comprises a graphene-based ion-sensitive field-effect transistor, or a conductive device that can detect chemical ions, linked to an artificial neural network, trained on various datasets. This is located in the top right of the device. Credit Saptarshi Das Lab/Penn State Usage Restrictions Must use credit License Original 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.