From the paper: "...when given a different task—namely, classification of suspicious mammographic densities (masses)—the pigeons proved to be capable only of im

From the paper: "...when given a different task—namely, classification of suspicious mammographic densities (masses)—the pigeons proved to be capable only of image memorization and were unable to successfully generalize when shown novel examples. " Sounds like overfitting, we need to L2 regularize these pigeons.