From The Parents' Review: Only these days we do it on a phone?

"We see it in the smaller details of life. A man reads a paper while crossing a crowded thoroughfare. His forebrain is in full attention on the newspaper. He takes no heed of the traffic. But his sub-consciousness guides him. That is, his sight centre and ear centre announce the approach of a vehicle, and without telegraphing to the forebrain for directions, wire on to the walking centre on which side to move. This shows that a large amount of information and knowledge is acquired by the brain, and stored up there to be used in a quiet fashion, without always rousing the full intellectual activities. One can see what a saving of brain work there must be if the brain can act automatically, or sub-consciously, without calling on the forebrain for its aid."  --  "The Brain in Relation to Education Part 2," by A. Wilson, Esq., M.D., in The Parents' Review, Volume 14, 1903, pgs. 435-450