**Human centric models for AGI are useful but not essential **

The brain cannot implement back propagation because the signals in the synapse move in one direction. The forward forward algorithm tries to approximate the good properties of back propagation without actually using it. However, for engineering a good system, there is no reason not to use back propagation. It is important to be inspired by humans and the brain, but it is crucial to focus on the essential qualities and not get too specific. The idea of the neural network, inspired by the brain, has been fruitful. It is necessary to determine what behaviors of human beings are essential and what is an emergent phenomenon. It is possible to be inspired by human intelligence with care.