"One reason the brain is so power efficient is that neural spikes charge only a small fraction of a neuron as they travel. By contrast, conventional chips keep

"One reason the brain is so power efficient is that neural spikes charge only a small fraction of a neuron as they travel. By contrast, conventional chips keep each and every transmission line at a certain voltage all the time." On thr contrary, the brain maintains a constant voltage on neurons, and spends a lot of power to maintain that voltage in the face of leakage current. It is just a much lower voltage. (50 mV rather than 1000 mV.)