Trump opened his palm, moved like playing an accordion, pouting, and Biden holding a pen, smiling when attacked, all exuded personality and psychology of each person.

Like the first argument, the two candidates do not shake hands at the beginning of the argument and the atmosphere of the event is calmer as the two men do not interrupt each other.

Traci Brown believes that Trump took advice from his aides to be calmer.

Alison Henderson, an expert at body language consulting firm Moving Image Consulting, also said that Trump has restrained himself to "not be as aggressive as the first argument".

Henderson pointed out that President Trump frequently moves his palms open and moves his hands in and out like an accordion.

However, Henderson commented that sometimes Trump pulled his shoulders and strained as he brought his hands together.

During the debate, Trump was attacked by Joe Biden on personal matters such as having an account in China and not disclosing tax records.

Trump referred to special counsel Robert Mueller's investigation into question of his campaign colluding with Russia during the 2016 election season, asserting Mueller's team had seen tax records and found no problems.

Meanwhile, Brown has another view of this gesture.

Expert Lauren Cohen said that at the beginning of the event, Biden had "calculated to wear a mask when entering and then remove it when approaching the podium".

Biden held a pen most of the time in discussion.

When he listened to Trump's criticism of his family or political career, Biden often laughed, shook his head and looked down, showing that what Trump said was too ridiculous.

Laughter when attacked may indicate that he does not take Trump's attacks seriously, dismisses them as "gossip" and shows that he is in control of the situation.

There have also been times when Trump put Biden in an impatient position, especially when Trump criticized Biden and Obama for doing so badly in their two terms of office.

Cohen remarked that Biden "sometimes avoids eye contact with Trump, which shows that the former vice president felt Trump was annoying and obnoxious."

Conversation editor Misha Ketchell pointed out that Trump's signature expression is pouting while listening and preparing to interrupt or rebut Biden.

Henderson pointed out that when he listened to Biden, Trump often tilted his head to the side and looked down, showing that he "looked down on opponents" and "showed himself on top".

The former vice president stumbled at times and was for a moment considered "odd" by USA Today near the end of the debate while looking for quite a while at his watch.

However, Cohen argues that Biden scored by sometimes looking directly at the camera instead of his opponent, as if he were communicating with an audience watching television, making the audience feel they were more important.

This is the strategy Biden used in the first debate.

However, Lillian Glass, a Los Angeles-based body language expert, once argued after the first debate that "it was not appropriate for Biden to look at the camera and try to win the audience's heart".

Trump seems to have found a way to neutralize this Biden's "rewritten old" move.

See details of the Trump - Biden debate