Schematic Presentation (image) University of Vienna Caption This is a schematic presentation of the invisible displacement tasks. In regular single and double invisible displacement task a reward inside a small container is moved behind one or two bigger screens. In transposition tasks two of three equal containers (only one is baited) are swapped once or twice. In rotation tasks the three containers (one is baited) are arranged in parallel on a rotatable platform. The platform can be rotated at different angles (90°, 180°, 270° and 360°). Translocation tasks are similar to Rotation tasks but the bird is carried around the container arrangement and released at different angles. Credit Alice Auersperg Usage Restrictions The image may only be used with appropriate caption or credit. 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.