To add on to the child comment, neurons seem to fire either as a one off pulse or at a fixed frequency for a duration of time known as a burst. There is no expl

To add on to the child comment, neurons seem to fire either as a one off pulse or at a fixed frequency for a duration of time known as a burst. There is no explicit 'input layer' or 'output layer' and signal propagation takes time so there is nothing stopping a self sustaining loop signal from forming. These are just two examples of effects which are not captured in the artificial neuron model used in ML.