The Evolutionary Mystery of Left-Handedness and What It Reveals About How the Brain Works

https://www.brainpickings.org/2014/03/31/left-handedness-david-wolman/


“Sahara is too little price / to pay for thy Right hand,” Emily Dickinson wrote in a poem. “The right hand = the hand that is aggressive, the hand that masturbates,” Susan Sontag pondered in her diary in 1964. “Therefore, to prefer the left hand! … To romanticize it, to sentimentalize it!” The human hand has long carried cultural baggage, and yet we still struggle to unclutch from it the myths and reveal the realities.

The question of why some humans are left-handed — including such notable specimens as Plato, Charles Darwin, Carl Sagan, Debbie Millman, Stephen Jay Gould, Noam Chomsky, and Albert Einstein* — has perplexed scientists for centuries. For Southpaws themselves — the affectionate term for lefties — this biological peculiarity has been everything from a source of stigma to a point of pride. But at the heart of it remains an evolutionary mystery — one that Wired contributing editor David Wolman, himself (but of course) a lefty, sets out to investigate in A Left-Hand Turn Around the World: Chasing the Mystery and Meaning of All Things Southpaw (public library).

Wolman, who spoke about the oddity of handedness in a fantastic recent Radiolab episode about conflict, traces 200 years of biological and psychological perplexity as he scours the world for answers, from a Parisian science museum that houses pioneering French surgeon and scholar Paul Broca’s bottled brains to a castle in Scotland that hides clues to the heritability of left-handedness to the neuroscience labs of Berkeley to the golf courses of Japan.

To be sure, a Southpaw wasn’t always a mere scientific curiosity, let alone the “lefty superiority complex” which Wolman both notes and embodies — for centuries, it was the subject of superstition, which bestowed upon its owner a serious social curse. Wolman writes:

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