Contrary to some reports, you don't have two brains
A bad press release makes a good excuse to look at how developmental biology works. https://arstechnica.com/science/2026/09/contrary-to-some-reports-you-dont-have-two-brains/?utm_brand=arstechnica&utm_social-type=owned&utm_source=mastodon&utm_medium=social
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@arstechnica "By dividing the nervous system up early, cells inherit a developmental history that allows a limited number of signals to trigger a great deal of complexity."
Sounds like an ordinary state machine. You don't need a number of signals equal to the number of states. You really only need one, a clock signal.