Experimental stimuli (Figure 1) (IMAGE) Toyohashi University of Technology (TUT) Caption The experimental stimuli were computer generated. There were four surface materials with five different thicknesses in depth. Thickness 1.0 is a sphere. As the thickness is reduced, the object is flattened in depth like a pancake, and as the thickness is increased, the object expands in depth like a rugby ball. Credit COPYRIGHT (C) TOYOHASHI UNIVERSITY OF TECHNOLOGY. ALL RIGHTS RESERVED. 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.