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It is not that modern people are less intelligent than their grandparents: only that, being busier, they are less careful. They must learn to take short cuts, skimming through the columns of a newspaper, flicking over the pages of a book or magazine, deciding at each new paragraph or page whether to read it either attentively or cursorily, or whether to let it go unread. There is a running commentary in the mind. For example, in reading a Life of Napoleon: ‘page 9 … yes, he is still talking about Napoleon’s childhood and the romantic scenery of Corsica … something about James Boswell and Corsican independence … tradition of banditry … now back to the family origins again … wait a minute … no … his mother … more about her … yes … French Revolution … page 24, more about the French Revolution … still more … page 31, not interested … ah … Chapter 2, now he’s at the military school … I can begin here … but oughtn’t to waste time over this early part … in the artillery, was he? … but when do we get to the Italian campaign?’ And even when the reader does get to the Italian compaign and settles down comfortably to the story, he seldom reads a sentence through, word by word. Usually, he takes it in either with a single comprehensive glance as he would a stream or a field of cows that he was passing in the train, or with a series of glances, four or five words to a glance. And unless he has some special reason for studying the narrative closely, or is in an unusually industrious mood, he will not trouble about any tactical and geographical niceties of the campaign that are not presented with lively emphasis and perfect clarity. And, more serious still from the author’s point of view, he will not stop when the eye is checked by some obscurity or fancifulness of language, but will leave the point unresolved and pass on. If there are many such obstructions he will skim over them until his eye alights on a clear passage again.
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Robert Graves (The Reader Over Your Shoulder: A Handbook for Writers of English Prose)