Researchers at the University of British Columbia compared Trump's speech style and Twitter usage to that of the other top nine Republican contenders.
The 70-year old real-estate mogul and reality star consistently ranked highest in ratings of grandiosity, "I"-statements, informal language, vocal pitch variation, and use of Twitter.
Trump beat Democratic rival Hillary Clinton in the knife-edge November 8 polls, defying the odds to become the US President-elect after starting off as a political outsider.
"Contrary to what might be expected, grandiosity, simplistic language and rampant Twitter activity were statistical predictors of success in the Republican primaries," said Paulhus.
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Speech segments from Trump, Ted Cruz, John Kasich, Ben Carson, Jeb Bush, Marco Rubio, Rick Perry, Lindsey Graham and Mike Huckabee were transcribed and analysed using a computerized text analysis software.
The researchers also conducted an acoustical analysis of the speeches, to determine pitch variability, which tends to promote an image of energy and dynamism.
They examined each candidate's Tweet count in the three months before they announced their candidacy.
"Even in everyday life, the difficulty of fact-checking everything people tell us forces us to rely on how they say it - and we've shown that this holds true even in political elections," said Paulhus.
"This phenomenon not only helps explain Donald Trump's political rise, but how questionable political leaders might gain power - even in democracies," he said.
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