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Complex or abstract ideas emerge as a result of the firing of many of these nerve cells, or neurons.

Musk was cagey in public at the time, simply writing in a social media post: "Initial results show promising neuron spike detection."

Whatever process occurred to do this preserved the original brain tissue so well that individual neurons can actually be seen using a scanning electron microscope.

It has been shown, for example, that exercise can change the hippocampus through a process called neurogenesis, where animals actually grow more neurons.

Gaynor remembered him as humble and almost classically nerdy, happy to spend hours on the phone explaining how motor neurons work.