I used to download sample LSAT tests to determine if I have the capacity to become a law student (which I may consider later in life). In one test I saw a passage narrating how communication evolved through time. At first, before writing systems were discovered, people used to exchange information orally. Over time, as you expect, people moved on to print which helped historians dig our past. In addition, reading and writing has always been associated with an increase in cognitive and comprehensive skills.