Six months after the first learning tests, the researchers repeated the touchscreen trials using the same eight abstract pictures as before in order to test the dog's long - term memory skills. (sciencedaily.com)
The first part required the animals to learn to correctly select four from a total of eight abstract pictures on a touchscreen. (sciencedaily.com)
Switch that out and add a modern abstract picture and you've got a more modern feel. (candlejunkies.com)