Richard Friedman: “Although I am a psychiatrist, I am not offering any specific medical diagnoses for any public figure. I have never met or examined either candidate. But I watched the debate with particular attention to the candidates’ vocabulary, verbal and logical coherence, and ability to adapt to new topics—all signs of a healthy brain.” “Although Kamala Harris certainly exhibited some rigidity and repetition, her speech remained within the normal realm for politicians, who have a reputation for harping on their favorite talking points.” “By contrast, Donald Trump’s expressions of those tendencies were alarming.