A number of scientists have posited than human intelligence can not evolve beyond its current level. They base this on that the amount of additional energy that would be required to service a higher intelligence could not be supplied.

High integration of brain networks seems to be associated with high IQ. ‘You pay a price for intelligence. Becoming smarter means improving connections between different brain areas but this runs into tight limits on energy, along with space for the wiring.’

 

 

                   I gots lotsa room fer brain growin

 

 

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It is true that we don't use the whole of our brains now

 

I thought that was a myth.

Intelligence evolves as long as people are less intelligent than driven by instinct.   As soon as intelligence is sufficient for the conscious decision to avoid breeding, because a childfree life is preferable, the genes of the people evolved that far die.   Only the less intelligent continue breeding.   That is the ceiling of the evolution of intelligence.

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