I wonder if they’re just activating small parts of the brain at once. It seems to me that they aren’t simulating every single neuron at all times, and I do not

I wonder if they’re just activating small parts of the brain at once. It seems to me that they aren’t simulating every single neuron at all times, and I do not see being able to run the model in real time. Are they also modelling the ventral nerve cord for the walking?