Decussation explanation

Neat story in the WaPo on the evolution of decussation (the crossings — mostly in the brainstem — that cause motor/sensory information to be processed in opposite halves of the brain from where the action is).

The article quotes Denis Jabaudon as extending an explanation originally from Ramon y Cajal: That the sensorimotor system is simply following suite with the visual system, which itself reversed right and left in the brain to compensate for the 180 degree inversion of an image on the retina (due to the lens of the eye).

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