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

But after seeing his neurons spike on a screen - all the while surrounded by excited Neuralink employees - he said "it all sort of sunk in" that he could control his computer with just his thoughts.

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.