Between when President Donald Trump assumed office in January 2017 and the end of April, the average number of public false or misleading statements he has made per day https://www.washingtonpost.com/graphics/politics/trump-claims-database/?utm_term=.56dc5ac4e004 (has been increasing.)According to the https://www.washingtonpost.com/news/fact-checker/wp/2018/05/01/president-trump-has-made-3001-false-or-misleading-claims-so-far/?utm_term=.e6895f364832 (Washington Post’s fact checkers) on May 1,https://www.washingtonpost.com/graphics/politics/trump-claims/?tid=a_inl&utm_term=.a090dd3e1ab0 ("for the president’s first 100 days), he averaged 4.9 claims a day... since we last updated this tally two months ago, the president has averaged about 9 claims a day."
This is a significant rise. Our calculations suggest that if the current escalation rate remains steady, by the end of his term the president could be making as many as 19 public false statements a day, on average.
To psychologists interested in the science of lying, Trump’s increasing mendacity presents an interesting question: What might be causing this growth?
...
[O]ur research points to yet another intriguing explanation — a biological process called emotional adaptation. Dishonesty Study | Affective Brain Lab
Emotion plays an important role in constraining dishonesty. If we feel bad when we lie, we are less likely to do so. But if this uncomfortable feeling were to magically disappear, research suggests we would in turn lie more.
Research we conducted at University College London with our colleagues Dan Ariely and Stephanie Lazzaro, which was published in 2016 in the journal Nature Neuroscience, showed that the intensity of the emotional response people experience when they act dishonestly is reduced every time they lie. And this reduction (which scientists call emotional adaptation) makes them likely to lie more over time.
...
It is thus likely that we will observe a continuing increase in the number of falsehoods emanating from the Oval Office, accompanied by less and less outrage from the public.