Scientists argue that the brain's contralateral wiring evolved around the optic tectum, an ancient visual processing center. Because the eye lens inverts images, the brain maps the opposite visual field to each hemisphere. This map likely forced sensory and motor pathways to cross the midline to stay aligned with visual input.
The theory links disparate neural circuits, from touch to movement, to a single evolutionary pressure for rapid visual reaction. It is a compelling hypothesis but remains theoretical, relying on comparative anatomy rather than direct observation of early tetrapod development. The exact timeline of when these pathways became fixed is still unclear.
more: https://www.sciencedaily.com/releases/2026/11/261103003146.htm
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