The information processing capability of cells, and the fact that single-celled creatures have behaviour, makes it hard for me to believe that neurons (not just

The information processing capability of cells, and the fact that single-celled creatures have behaviour, makes it hard for me to believe that neurons (not just in humans, in all animals with neurons) don't use any of this information processing capability. I understand researchers have claimed to replicate the brains of some very simple animals (having something like 306 neurons)... but have they replicated the behaviour, i.e. for the same initial and ongoing inputs, you get the same outputs as the modeled brain? That should show the accuracy of the neuron model.