Psychologists break down the meaning of Donald Trump's handshake

The way the president shakes hands has been in the news as of late, especially those with French President Emmanuel Macron.

Macron said his first shake with Trump was a "moment of truth." Another interaction between the two, this time at the NATO Summit, went viral:

Here is a compilation put together in February that exemplifies Trump's "pull" and forceful style of handshake:

The Huffington Post spoke with psychology professors about what this may mean. Florin Dolcos, a University of Illinois associate psychology professor and faculty member at the Beckman Institute's Cognitive Neuroscience Group, suggested that it's a learned behavior "because typically you don't do that," he told Huffington Post.

"You do it with people very close to you in natural circumstances. Not people you don't really know," Dolcos continued. "In a way it could be seen as a trap." Dolcos suggests this could be Trump's way of asserting dominance, and that he may even practice these handshakes.

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President Donald Trump meeting other world leaders
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President Donald Trump meeting other world leaders
Canadian Prime Minister Justin Trudeau (L) is greeted by greets U.S. President Donald Trump in the Oval Office at the White House in Washington, U.S., February 13, 2017. REUTERS/Kevin Lamarque - TPX IMAGES OF THE DAY
Japanese Prime Minister Shinzo Abe and U.S. President Donald Trump pose for a photograph before attending dinner at Mar-a-Lago Club in Palm Beach, Florida, U.S., February 11, 2017. REUTERS/Carlos Barria
U.S. President Donald Trump looks down at a bust of former British Prime Minister Winston Churchill while meeting with British Prime Minister Theresa May at the White House in Washington, U.S., January 27, 2017. REUTERS/Kevin Lamarque TPX IMAGES OF THE DAY
Israeli Prime Minister Benjamin Netanyahu addresses a joint news conference with U.S. President Donald Trump (R) at the White House in Washington, U.S., February 15, 2017. REUTERS/Carlos Barria
Angela Merkel, Germany's chancellor, left, speaks with U.S. President Donald Trump, during a meeting in the Oval Office of the White House in Washington, D.C., U.S., on Friday, March 17, 2017. Merkel, who is running for a fourth term in Germanys election in September, plans to explain her view of the mutual advantages of free trade during her talks with Trump on Friday, according to German officials. Photographers: Pat Benic/Pool via Bloomberg
King Abdullah II of Jordan, left, looks towards U.S. President Donald Trump after shaking hands during a news conference in the Rose Garden of the White House in Washington, D.C., U.S., on Wednesday, April 5, 2017. The talks with the Jordanian monarch are expected to focus on other regional issues, including Syria and the Israeli-Palestinian peace process. Photographer: Andrew Harrer/Bloomberg via Getty Images
U.S. President Donald Trump, right, shakes hands with Abdel-Fattah El-Sisi, Egypt's president, during a meeting inside the Oval Office of the White House in Washington, D.C., U.S., on Monday, April 3, 2017. Trump�said Monday his buildup of the U.S. military would help El-Sisi�fight terrorism as the two met at the White House for their first summit of the Trump presidency. Photographer: Olivier Douliery/Pool via Bloomberg
US President Donald Trump meets with Iraqi Prime Minister Haider Al-Abadi in the Oval Office in the White House on March 20, 2017, in Washington, DC. / AFP PHOTO / MOLLY RILEY (Photo credit should read MOLLY RILEY/AFP/Getty Images)
US President Donald Trump (L) and Chinese President Xi Jinping (R) walk together at the Mar-a-Lago estate in West Palm Beach, Florida, April 7, 2017. President Donald Trump entered a second day of talks with his Chinese counterpart Xi Jinping on Friday hoping to strike deals on trade and jobs after an overnight show of strength in Syria. / AFP PHOTO / JIM WATSON (Photo credit should read JIM WATSON/AFP/Getty Images)
U.S. President Donald Trump meets Prime Minister Lokke Rasmussen of Denmark outside the West Wing of the White House March 30, 2017 in Washington, DC. President Trump is hosting Prime Minister Rasmussen with an Oval Office meeting. (Photo by Cheriss May/NurPhoto via Getty Images)
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Former Trump aid Sam Nunberg thinks that Trump knows what he's doing with these handshakes. "I just think the president is very cognizant of the optics of what it looks like at these multilateral meetings with world leaders," he told Huffington Post, "and I even think [the handshake] is symbolic to the America First theme of his presidency and campaign."

Nunberg believes his handshake is indicative of Trump's famous phrase, too. He told Huffington Post, "If we are talking about his handshake, it is kind of analogous to us talking about him when he takes his finger and says, 'You're fired.' There is nobody who is a better showman and more cognizant of the optics than I've ever worked with than him."

You can read the entire analysis here.

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