"Vision lets you take in mega-bytes of information in seconds. Speech processing involves far less because language processing is such a hard problem for the br

"Vision lets you take in mega-bytes of information in seconds. Speech processing involves far less because language processing is such a hard problem for the brain." I've read that people with extraordinary memory or mental arithmetic ability often visualize shapes and perform operations on them to get at the answer. And I guess "normal" people use "subvocalization" instead. In light of your comment, that makes sense.