A diagram shows the placement of the electrodes during an experiment at the department of Ethology of the Eotvos Lorand University in Budapest, Hungary, on Wednesday, March 27, 2024. A new study in Hungary has found that beyond being able to learn how to perform commands, dogs can learn to associate words with specific objects ? a relationship with language called referential understanding that had been unproven until now. (AP Photo/Denes Erdos)