Measuring toe contact (IMAGE) University of California - Berkeley Caption Taking advantage of a phenomenon called frustrated total internal reflection, the researchers were able tell which parts of the toe pad (bright spots) were in contact with the surface and supporting the gecko's weight. Credit Yi Song 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.