How does this compare in terms of Muscle Memory https://en.wikipedia.org/wiki/Muscle_memory https://en.wikipedia.org/wiki/Muscle_memory and instinct reactions,

How does this compare in terms of Muscle Memory https://en.wikipedia.org/wiki/Muscle_memory https://en.wikipedia.org/wiki/Muscle_memory and instinct reactions, things we do from inputs without thinking about at the time of doing. People tend to react if you shout "Timber" near tree's, and rightly so. They react first and think after they have already started reacting. Is Bicameralism just another way of trying to define primal instinct and how that gave way to intelligent thinking as the main driver in the human evolution I wonder.