Social Engineering Blogs

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Social Influence in Investigative Interviews

We talk a lot about how to understand people’s emotions and how to read what they say accurately, but what about learning how we can change our behavior so that they are more forthcoming?

This is the subject of a recent paper by Humintell’s Dr. David Matsumoto and Hyisung Hwang. In this study, they sought to examine the impact that different cues of authority had on information interviews. This was an attempt to determine whether the truth-tellers or the liars in a mock interview context were more likely to convey information, depending on the influence of the interviewer.

After recruiting participants, they were divided into a treatment and control group. The treatment group was encouraged to commit a mock crime but told not to disclose that they had done so, while the control group simply proceeded directly to the informational interview.

This design split the participants into those who had to lie and those who had to tell the truth during the interview, with each being encouraged by a small monetary payout to convince the interviewer that they were telling the truth and had not committed the crime.

However, there were other experimental conditions at play, namely the environmental context and appearance of the interviewer. In order to prime a sense of interviewer authority, for instance, some of the interviewer wore intimidating suits or had impressive degrees and law enforcement posters on the wall.

Nothing beyond those environmental factors was different. All of the interviewers followed the same script and spoke in comparable fashions, but previous research has seen profound differences in perceptions of authority based on these apparently simple differences.

Overall, they found that the authority conditions got truth-telling participants to freely volunteer more information than their counterparts in low-authority conditions. However, there was no effect for the liars.

Interestingly, the effect of the authority condition seemed to hold even for the truth-tellers written statements, even though these were completed after the interview. This suggests that there is some lasting impact from an impression of interviewer authority.

This helps expand on previous work that looked at how to evaluate interviewees’ truthfulness and emotions by looking instead at what can promote efficacy by the interviewer. It appears that these signs of authority, even if limited to clothing, can result in more forthcoming interviews.

While this appeared to only work on people who were already telling the truth, that does not take away from the usefulness of this information. Many interviews are conducted on truthtellers, with the struggle sometimes involving getting tight-lipped people to speak more freely. Wearing a suit or even putting your diploma on the wall might help here!

In the meantime, there is always more that needs to be learned about how to tell if your interlocuter is lying, so check out Humintell’s exciting training procedure!

Dr. Matsumoto Podcast Interview Part 2

Last week, we began discussing Dr. David Matsumoto’s podcast interview, but we weren’t able to get to all of it. So, now time to discuss the second half!

This time around, Dr. Matsumoto expounded on topics including the connection between deception and microexpressions, the role of gestures in communication, education, and artificial intelligence.

One of the important uses of microexpressions is their role in deception detection and lying. Even when somebody is trying to mask their true emotion, signs of it will “leak out” before they are able to sport the smile or passive expression that would hide their feelings. This is even more likely when that underlying emotion is particularly intense.

These “leaks” don’t necessarily prove truth or deception, but they may show that the emotion being expressed is not the expression being experienced. This can be the case for their gestures, body language, or facial expression.

Dr. Matsumoto connects this idea to the use of microexpressions. It is these ultra-quick expressions that get produced, but they are very hard to notice. Even people who notice a strange expression struggle at interpreting it. That is why most of the research involves video taping people and looking at the tapes frame by frame.

After this discussion, the interviewer sought to understand how different behaviors translate to their underling emotion.

While this is a big question, Dr. Matsumoto started by discussing different kinds of gestures. For example, certain types of hand waving exist to “animate speech.” These do not have inherent meaning, but this is still important in conveying excitement or word emphasis. Other gestures, called “emblems” can have specific verbal messages and include the “thumbs up,” among many others.

Gestures help with communication, but they also strengthen our own cognition. In experimental settings where hand gestures are constrained, people are shown to struggle at performing certain tasks, such as memory tests or mathematical problems.

Both Dr. Matsumoto and the interviewer emphasized the role of nonverbal communication in education. Clearly, an educational context is shaped by environmental factors, the behavior of the professor, and the way that professor conveys information.

Because these environmental factors determine a lot about a communicative context, as we discussed last week, Dr. Matsumoto emphasized the need for teachers to arrange classrooms as they saw necessary to determine certain sorts of educational engagement.

Similarly, while society emphasizes “what to say,” it often does not focus on how teachers should say things. Even if we praise (or chastise) a student, it is very important how this is done, in terms of the gestures and nonverbal behaviors conveyed by the teacher.

Finally, the interview ended with a discussion of artificial intelligence and how machines can be made to communicate effectively. Dr. Matsumoto stressed the need for machines to resemble humans but suggested that there was still uncertainty over exactly how human the robot looked.

Dr. Matsumoto Podcast Interview

Communication may be much vaster than we thought.

In a new podcast, Humintell’s Dr. David Matsumoto helps explain the non-verbal world of communication to wider audiences. He emphasizes that non-verbal communication is anything that does not include verbal language, but the varieties of non-verbal communication are almost endless.

One of these is based in the environment. What is the lighting of the conversation? Is music playing or is there a specific sound? This helps communicate something. Similarly, our personal characteristics, such as how we dress, convey something revealing about our personality, without us even opening our mouths.

Dr. Matsumoto also describes “behavioral traces.” Even when we are not in the room, certain aspects of our personality can be conveyed. For instance, if somebody were to enter your house without your presence, they would see how you have laid out your room. They would see what you put on the walls. Each of these things communicates something to that person.

While these forms of communication are not Humintell or Dr. Matsumoto’s focus, they help show how many things we can use to understand people and how vast the potential for communication without words is.

Of particular focus, however, are non-verbal behavior which includes the microexpressions, body language, and other slight activities that we engage in. While words are incredibly powerful, they must inevitably exist within a context of non-verbal behavior, and non-verbal communication more broadly.

In fact, when verbal messages contradict non-verbal messages, most of the information we garner from the conversation come from the non-verbal messages. Even though we are often bad at reading these forms of communication, there is still some instinctive receptivity, according to Dr. Matsumoto.

After discussing non-verbal messages, the conversation shifted to whether expressions are universal, which is of course a major topic of this blog.

Dr. Matsumoto emphasized the biological research showing the presence of expressions, emotions, and behaviors across cultures. This tendency is innate in us from the level of infancy, but it is also quickly modulated and influenced by the culture that we are in. Our cultures helps shape what we would feel emotional about, for instance.

When asked about the impact of globalization and cultural homogenization, Dr. Matsumoto pointed out that this is a significant cultural force and that, especially in urban areas, cultures are increasingly merging. However, it remains unclear what impacts this will have on cultural expression and serves as a potentially fascinating place for future research.

The only preliminary research about homogenization in communication has come at the level of gestures. Traditionally, gestures have been thought to be incredibly specific to cultures, but Dr. Matsumoto’s work has found that people are able to recognize certain gestures, like “thumbs up”, no matter what culture they have come from.

Please stay tuned for a blog on the rest of this fascinating podcast! And let us know what you think about these exciting ideas.