Now if these early brains have pre-vertebrate nerve and other sensory systems, will we have essential services like fluid flows controlled by these. These would explain the location of the amygdala above the soft palate - where it can sense intake fast - and around the brainstem but below the main brain as well as the closing down of the nicer mammalian mind and pain threshold whenever pre-reptilian survival reactions are engaged. If it helped survival, selection grabbed it.
The mechanism of the early nervous systems is getting clearer. Not all nerves follow the spinal column, some go straight to the brain. Also the speed of sound in fluid is many times faster than in air, so a mosquito landing on the toe is felt by pressure wave at the brain long before flight sounds stop or the bitten signal travels up in the vertebrae. Those who lack these senses get malaria quicker.
Next step seems to be working out how nerve-types evolved and work.
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