In their first experiments, Lashley was in charge of building different mazes for the rats to go through and Franz was in charge of making the lesions in the rats' brains. What Lashley and Franz had both observed before the lesions was that their rats became better and better at getting through the mazes to find food and they were testing if lesions had an influence on the rats' memory and ability to get through the mazes. Franz made multiple lesions in specific parts of the brains and after they healed, put them through the maze to see if they had deficits in finding the food. What they found was that the mice had no deficits finding the food if the lesions were in a specific part of the brain but if the lesions damaged a large portion of the brain, they did have troubles finding food.