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some big-brained ancestors out of the crowd, favoring their smarts over others, but because energy allocated to growing egg-laden ovarian follicles went to our heads instead.
Building on previous work, González-Forero used basic math to create equations that describe how brain and body tissues grow under limits imposed by the energy costs involved and the genetic traits controlling energy allocation in the body at various stages of development. In 2018, he and fellow University of St Andrews mathematician Andy Gardner found that 'ecological' challenges such as finding food and lighting fires might have been key problems that favored greater brain-power, and notthat otherwise held back brain growth.
The new approach"enables deeper analysis, showing that hominin brain expansion occurs in the model because of direct selection on follicle count rather than on brain size," González-Foreroonly evolved bigger brains when the energy allocated to the growth of reproductive tissues – specifically the follicles in the ovary that nurture and release an egg each month – was freed up at a crucial stage of human development.
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