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After age 40, the brain decreases in volume by about 5 percent every decade. The most noticeable loss is in the frontal lobes. These control motor functioning of the sort that would direct a hand to a cup and a cup to the mouth in one fluid motion—in most cases without even looking at the cup. Though it is not possible to diagnose a person with dementia based on speech patterns alone, these are the sorts of changes that appear in early stages of Alzheimer’s. Trump has likened himself to Ronald Reagan, and the changes in Trump’s speech evoke those seen in the late president. Reagan announced his Alzheimer’s diagnosis in 1994, but there was evidence of linguistic change over the course of his presidency that experts have argued was indicative of early decline. His grammar worsened, and his sentences were more often incomplete. He came to rely ever more on vague and simple words: indefinite nouns and “low imageability” verbs like have, go, and get.
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