It takes around 15-20 transistors to make a simple neuron simulation: https://www.quora.com/How-many-transistors-can-be-used-to-replace-one-neuro-cell https://

It takes around 15-20 transistors to make a simple neuron simulation: https://www.quora.com/How-many-transistors-can-be-used-to-replace-one-neuro-cell https://www.quora.com/How-many-transistors-can-be-used-to-re... But: "Synapses are usually separately modeled in transistors (they are not part of the neuron circuits described above) and dramatically add to the transistor count." "[A neuron] has on average 7000 synaptic connections to other neurons." So we're not there yet, but it's definitely an improvement!