Snakes and how they helped our big brains evolve

The threat of snakes gave primates superior vision and large brains -- and fueled a critical aspect of human evolution, UC Davis anthropology professor Lynne Isbell argues in a new book.

From the temptation of Eve to the venomous murder of the mighty Thor, the serpent appears throughout time and cultures as a figure of mischief and misery.

The worldwide prominence of snakes in religion, myth, and folklore underscores our deep connection to the serpent—but why, when so few of us have firsthand experience?

The surprising answer, University of California, Davis, anthropology professor Lynne A. Isbell suggests, lies in the singular impact of snakes on primate evolution.

In "The Fruit, the Tree, and the Serpent: Why We See So Well" (Harvard University Press; April 30, 2009; $45.00), Isbell tells us that predation pressure from snakes is ultimately responsible for the superior vision and large brains of primates—and for a critical aspect of human evolution.

Drawing on extensive research, Isbell further speculates how snakes could have influenced the development of a distinctively human behavior: our ability to point for the purpose of directing attention. A social activity (no one points when alone) dependent on fast and accurate localization, pointing would have reduced deadly snake bites among our hominin ancestors.

It might have also figured in later human behavior: Snakes, "The Fruit, the Tree, and the Serpent" eloquently argues, may well have given bipedal hominins, already equipped with a non-human primate communication system, the evolutionary nudge to point to communicate for social good, a critical step toward the evolution of language, and all that followed.

Source: University of California - Davis

   

• docknowledge - May 01, 2009
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  "Surprising answer"? Didn't somebody come up with this idea years ago?
  
  Speaking of which, what exactly is surprising? That evolutionary pressure from some source caused evolutionary change?
  
  I think I'd vote for mosquitoes, myself. They're a lot more common, obvious, and annoying than the occasional cobra in a bad mood.
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• tj10 - May 03, 2009
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  This is science? This is simply speculation and no one can prove or disprove it. And yet the title of the article reports it as FACT! Shame on the press! Shame on Physorg. This is how so many people end up believing false things. This cannot be proven. You can't do an experiment in the lab over and over again. This should not be viewed as science. It is simply a just-so story to try and find a way to make the evolution story sound feasible. We will never know if it happened this way or not. It is simply an exercise in imagination, a game anyone can play. I'm tired of just so stories being treated as fact.
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