How non-verbal cues can predict person's—and robot's—trustworthiness

September 11, 2012
Nexi the robot has been furthering social science and social robotics studies for the past several years. Photo by Mary Knox Merrill.

People face this predicament all the time—can you determine a person's character in a single interaction? Can you judge whether someone you just met can be trusted when you have only a few minutes together? And if you can, how do you do it?

Using a robot named Nexi, Northeastern University David DeSteno and Cynthia Breazeal from MIT's Media Lab and Robert Frank and David Pizarro from Cornell University have figured out the answer. The findings were recently pub¬lished in the journal , a journal of the Association for Psychological Science.

It's What You're Not Saying…

In the absence of reliable information about a person's reputation, can offer a look into a person's likely actions. This concept has been known for years, but the cues that convey trustworthiness or untrustworthiness have remained a mystery. Collecting data from face-to-face conversations with research participants where money was on the line, DeSteno and his team realized that it's not one single non-verbal movement or cue that determines a person's trustworthiness, but rather sets of cues. When participants expressed these cues, they cheated their partners more, and, at a gut level, their partners expected it. "Scientists haven't been able to unlock the cues to trust because they've been going about it the wrong way," DeSteno said. "There's no one golden-cue. Context and coordination of movements is what matters."

Robots Have Feelings, Too

People are fidgety – they're moving all the time. So how could the team truly zero-in on the cues that mattered? This is where Nexi comes in. Nexi is a humanoid that afforded the team an important benefit – they could control all its movements perfectly. In a second experiment, the team had research participants converse with Nexi for 10 minutes, much like they did with another person in the first experiment. While conversing with the participants, Nexi—operated remotely by researchers—either expressed cues that were considered less than trustworthy or expressed similar, but non-trust-related cues. Confirming their theory, the team found that participants exposed to Nexi's untrustworthy cues intuited that Nexi was likely to cheat them and adjusted their financial decisions accordingly. "Certain nonverbal gestures trigger emotional reactions we're not consciously aware of, and these reactions are enormously important for understanding how interpersonal relationships develop," said Frank. "The fact that a robot can trigger the same reactions confirms the mechanistic nature of many of the forces that influence human interaction."

Real-Life Application

This discovery has led the research team to not only answer enduring questions about if and how people are able to assess the of an unknown person, but also to show the human mind's willingness to ascribe trust-related intentions to technological entities based on the same movements. "This is a very exciting result that showcases how social robots can be used to gain important insights about human behavior," said Cynthia Breazeal of MIT's Media Lab. "This also has fascinating implications for the design of future robots that interact and work alongside people as partners." Accordingly, these findings hold important insights not only for security and financial endeavors and for the evolving design of robots and computer-based agents. The subconscious mind is ready to see these entities as social beings.

Explore further: Looks matter more than reputation when it comes to trusting people with our money

Related Stories

Looks matter more than reputation when it comes to trusting people with our money

May 14, 2012
(Medical Xpress) -- Our decisions to trust people with our money are based more on how they look then how they behave, according to new research from the University of Warwick.

Recommended for you

New study rebuts the claim that antidepressants do not work

August 18, 2017
A theory that has gained considerable attention in international media, including Newsweek and the CBS broadcast 60 minutes, suggests that antidepressant drugs such as the SSRIs do not exert any actual antidepressant effect. ...

Should I stay or should I leave? Untangling what goes on when a relationship is being questioned

August 17, 2017
Knowing whether to stay in or leave a romantic relationship is often an agonizing experience and that ambivalence can have negative consequences for health and well-being.

Kids learn moral lessons more effectively from stories with humans than human-like animals

August 17, 2017
A study by researchers at the Ontario Institute for Studies in Education (OISE) at the University of Toronto found that four to six-year-olds shared more after listening to books with human characters than books with anthropomorphic ...

History of stress increases miscarriage risk, says new review

August 17, 2017
A history of exposure to psychological stress can increase the risk of miscarriage by upto 42 per cent, according to a new review.

Study finds children pay close attention to potentially threatening information, avoid eye contact when anxious

August 17, 2017
We spend a lot of time looking at the eyes of others for social cues – it helps us understand a person's emotions, and make decisions about how to respond to them. We also know that adults avoid eye contact when anxious. ...

Communicating in a foreign language takes emotion out of decision making

August 16, 2017
If you could save the lives of five people by pushing another bystander in front of a train to his death, would you do it? And should it make any difference if that choice is presented in a language you speak, but isn't your ...

0 comments

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.