S2_movie (VIDEO) University of Southern Denmark This video is under embargo. Please login to access this video. Caption The high-speed video shows vocal membranes and false vocal folds vibrating at different frequencies. Credit University of Southern Denmark Usage Restrictions w caption 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.