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0406: The simplest possible brain
Niall Palfreyman
This simple, generic biological integral-control component is used by
E. coli
to decide on an adaptive tumbling frequency.
1. If Ligand concentration stays constant, the bacterium tumbles at a low, exploratory rate of ~2 Hz.
2. If Ligand concentration rises (attractant), tumbling frequency falls to continue moving toward the source.
3. If Ligand concentration falls (repellant), tumbling frequency rises to avoid the source.