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The American psychologist Julian Jaynes, in a controversial study on the origin of consciousness, argued that the bicameral mind - in which one of the hemispheres becomes specialized in silent reading - is a late development in humankind's evolution, and that the process by which this function develops is still changing.

"A History of Reading". Book by Alberto Manguel, 1996.
The American psychologist Julian Jaynes, in a controversial study on the origin of consciousness, argued that the bicameral mind - in which one of the hemispheres becomes specialized in silent reading - is a late