Silent reading is done silently, or without speaking the words being read. Before the reintroduction of separated text (spaces between words) in the Late Middle Ages, the ability to read silently may have been considered rather remarkable.In contrast, reading aloud activates many more parts of the brain due to the dual-route of feedback when pronouncing and reading. Scholars assume that reading aloud (Latin clare legere) was the more common practice in antiquity, and that reading silently (legere tacite or legere sibi) was unusual. In his Confessions, Saint Augustine remarks on Saint Ambrose's unusual habit of reading silently in the 4th century AD:
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