brains and then I have no clue how how they measure any of this but then they compare the hidden representations of the living neural networks and the artificial neural networks and it turns out that the these the networks that were trained with backpropagation x' then networks that were not trained with backdrop so basically that means if you train a network with backprop it matches the biological networks much closer in how they form their hidden representations and they they do a number they cite the number of