Two type of tests (IMAGE) Eötvös Loránd University Caption Two behavioural tests were applied in family dogs to investigate how a sudden reduction in the value of a reward changes performance. The researchers used cooked beef liver as a high-value reward and dry dog food as a low-value reward Credit The first part of the picture is provided by Mariana Bentosela, Grupo de Investigación del Comportamiento en Cánidos in Argentinaand; the second part is made by: Enikő Kubinyi / Eötvös Loránd University Usage Restrictions Credit must be given 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.