{"id":2119,"date":"2019-03-31T13:59:38","date_gmt":"2019-03-31T12:59:38","guid":{"rendered":"https:\/\/globalfraudforensics.com\/fraudxpose\/?p=2119"},"modified":"2019-03-31T13:59:38","modified_gmt":"2019-03-31T12:59:38","slug":"virtual-case-notes-ai-polygraph-knows-when-you-lie-online","status":"publish","type":"post","link":"https:\/\/globalfraudforensics.com\/fraudxpose\/virtual-case-notes-ai-polygraph-knows-when-you-lie-online\/","title":{"rendered":"Virtual Case Notes: AI \u2018Polygraph\u2019 Knows When You Lie Online"},"content":{"rendered":"

FSU researcher Shuyuan Ho is working on an AI system that can use language cues associated with deception to predict whether someone is lying online. (Photo: Courtesy of Florida State University)<\/em><\/span><\/p>\n

Editor\u2019s Note: Welcome to my weekly column, Virtual Case Notes, in which I interview experts on the latest developments in digital forensics and cybersecurity. Each week I take a look at new cases and research from the evolving world of cybercrime. For previous editions, please type \u201cVirtual Case Notes\u201d into the search bar at the top of the site.<\/em><\/span><\/p>\n

If you\u2019re trying to figure out whether someone is lying, you might focus on their body language, eye movement, facial expressions or tone of voice. If you\u2019re a polygraph examiner, you\u2019ll monitor their heart rate, blood pressure, breathing and other physical signs that can indicate a person knows they\u2019re not telling the truth.<\/span><\/p>\n

But when face-to-face interaction is stripped away, and all you have to go on is words on a screen, determining the truthfulness and intentions of someone just from what they type is a much more daunting task. The use of social media and instant messaging has made lying and scamming easier than ever, as plenty of phishers, fraudsters and\u00a0\u201ccatfishers\u201d<\/a>\u00a0have already figured out.<\/span><\/p>\n

Now, a Florida State University researcher is figuring out how to use online liars\u2019 words against them, with an artificial intelligence approach that learns the subtle differences in language between honest and deceptive chatters.<\/span><\/p>\n

\u201cDo liars speak more words of self-reference, or do the truth-tellers speak more self-reference? Or, what kind of words do they use?\u201d said Shuyuan Ho, an assistant professor at FSU\u2019s School of Information, in an interview with\u00a0Forensic Magazine<\/em>. \u201cWe used a machine learning approach to analyze (online chat messages) \u2026 The machine is able to parse out and correlate the cues.\u201d<\/span><\/p>\n

Ho and her colleagues, including fellow FSU professor Xiuwen Liu and Stanford University communications professor Jeffrey T. Hancock, set up an experiment where 40 participants played an online game called \u201cReal or Spiel,\u201d which involved players asking and answering questions in pairs over an instant chat messenger.<\/span><\/p>\n

Participants were assigned either a \u201cspeaker\u201d or \u201cdetector\u201d role, and each speaker was assigned either a \u201csaint\u201d (truth-teller) or \u201csinner\u201d (liar) role. The detectors would ask questions about a pre-assigned topic to the speaker, who would answer either truthfully or untruthfully depending on their role, and then the detector would guess whether their opponent was a saint, or a sinner. A total of 80 game sessions were conducted during the study.<\/span><\/p>\n

The experiment revealed that the accuracy of the human participants in correctly guessing their opponent\u2019s role was 52.4 percent. Essentially, this suggests the average person has only slightly better than coin-toss odds of being able to tell whether they\u2019re being lied to while chatting online.<\/span><\/p>\n

\u201cWe tend to think that we can do very well (detecting lies) online, but the result is not so based on all these experiments,\u201d explained Ho.<\/span><\/p>\n

This experiment was conducted in 2014 and 2015, and the results on participants\u2019 deception strategies and ability to detect deception were\u00a0first reported<\/a>\u00a0in the\u00a0Journal of Management Information Systems<\/em>\u00a0in 2016. But this past February, Ho and Hancock published\u00a0new research<\/a>\u00a0in the journal\u00a0Computers in Human Behavior<\/em>, showing the results of testing their \u201conline polygraph\u201d on the dataset from the original experiment.<\/span><\/p>\n

Ho said the results were \u201camazing.\u201d After first using linear regression analysis to determine which language cues were associated with deception, the researchers used logistic regression analysis to predict whether each speaker from the game was a saint or a sinner. The researchers found that the computer could identify liars 82.5 percent of the time, and overall identify the speakers\u2019 roles with 74 percent accuracy. This performance was much better than that of the human participants.<\/span><\/p>\n

Among the cues associated with deception were a more frequent use of insight words such as \u201cthink\u201d and \u201cknow,\u201d as well as words of certainty like \u201calways\u201d and \u201cnever.\u201d Truth-tellers were more likely to use words that expressed less certainty, like \u201cperhaps\u201d and \u201cguess,\u201d and expressed causation more often, with words like \u201cbecause\u201d and \u201csince.\u201d<\/span><\/p>\n

Self-reference words like “I” and “me” were also factored in\u2014the earlier paper in\u00a0JMIS<\/em>\u00a0showed that liars tended to make less references to themselves than truth-tellers. The time it took for participants to respond was one of the few non-word-related cues that were considered\u2014deceptive participants were found to respond more quickly than truth-tellers.<\/span><\/p>\n

Ho noted that the preliminary results of this experiment confirm the ability of statistical models and AI to pick up the subtle signs of deception better than their human counterparts, but added that the research still has a long way to go. She also acknowledged the debate around the accuracy of traditional polygraphs, and stressed that even if the online polygraph became more accurate, it would still be used more as a \u201creference point\u201d than a quick solve.<\/span><\/p>\n

\u201cAny of the prediction technology systems, they always have false alarms (false positives\/false negatives). It\u2019s always going to be (that way)\u2014that\u2019s just the nature of prediction itself,\u201d Ho said. \u201cIf it\u2019s adapted by (an) organization, then it can help them make some decisions. It will be viewed as a recommendation system.\u201d<\/span><\/p>\n

Although traditional polygraph tests are typically not admissible in court, they are still used in investigations by law enforcement and intelligence agencies\u2014Ho sees potential\u00a0applications in these areas when the technology is further developed. She also mentioned that another form of artificial-intelligence-aided lie detection has been tested for use by border security, using facial expression and body language recognition to predict deception or truthfulness.\u00a0According to CNBC<\/a>, these systems have shown to be up to 80 percent accurate.<\/span><\/p>\n

A more general potential application of the technology would be personal use by private web users\u2014perhaps those who are tired of falling for online scams, or who are wary of being deceived in the online dating scene.<\/span><\/p>\n

In order to bring the technology\u2019s helpfulness to fruition, Ho seeks to expand her research to include a much great volume of data, which could help build more accurate models and reveal more clues about the nature of online deception.<\/span><\/p>\n

\u201cMy vision is to have this (game) completely available online, so then people can play with that system,\u201d Ho said. \u201cWe can do a big data collection \u2026 If we make it a fun experience for people, I think it has a lot of potential.\u201d<\/span><\/p>\n

 <\/p>\n

https:\/\/www.forensicmag.com\/news\/2019\/03\/virtual-case-notes-ai-polygraph-knows-when-you-lie-online<\/a><\/span><\/p>\n","protected":false},"excerpt":{"rendered":"

FSU researcher Shuyuan Ho is working on an AI system that can use language cues associated with deception to predict whether someone is lying online. (Photo: Courtesy of Florida State University) Editor\u2019s Note: Welcome to my weekly column, Virtual Case Notes, in which I interview experts on the latest developments in digital forensics and cybersecurity. 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researcher Shuyuan Ho is working on an AI system that can use language cues associated with deception to predict whether someone is lying online. 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