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Computers Better Than Humans for Assessment of Personality?

Provocative new research suggest a computer is a better judge of a person’s personality than the person’s family or friends.

People’s judgments were based on their familiarity with the judged individual, while computer models used a specific digital signal: Facebook Likes.

The results show that by mining Facebook Likes, the computer model was able to predict a person’s personality more accurately than most of their friends and family.

Given enough Likes to analyze, only a person’s spouse rivalled the computer for accuracy of broad psychological traits.

The study has been published today in the journal PNAS.

Researchers at the University of Cambridge and Stanford University describe the finding as an “emphatic demonstration” of the capacity of computers to discover an individual’s psychological traits through pure data analysis.

Researchers believe their findings show that machines can know us better than we’d previously thought. Investigators believe this determination is an “important milestone” on the path towards more social human-computer interactions.

“In the future, computers could be able to infer our psychological traits and react accordingly, leading to the emergence of emotionally intelligent and socially skilled machines,” said Cambridge’s Wu Youyou.

“In this context, the human-computer interactions depicted in science fiction films such as ‘Her’ seem to be within our reach.”

The researchers say these results might raise concerns over privacy as such technology develops. In this environment, the research team believes policies should be enacted that give users full control of their digital footprint.

In the current study, researchers discovered a computer could more accurately predict the subject’s personality than a work colleague by analyzing just ten Likes.

The computer was more accurate on profiling personality than a friend or a cohabitant (roommate) when 70 Likes, a family member (parent, sibling) with 150 Likes, and a spouse with 300 Likes.

Given that an average Facebook user has about 227 Likes (and this number is growing steadily), the researchers say that this kind of artificial intelligence has the potential to know us better than our closest companions.

The current research build on previous work from the University of Cambridge which showed that a variety of psychological and demographic characteristics could be predicted with startling accuracy through Facebook Likes.

In the new study, researchers used a sample of 86,220 volunteers on Facebook who completed a 100-item personality questionnaire through the myPersonality app, as well as providing access to their Likes.

These results provided self-reported personality scores for what are known in psychological practice as the “big five” traits: openness, conscientiousness, extraversion, agreeableness, and neuroticism — the OCEAN model.

Through this, researchers could establish which Likes equated with higher levels of particular traits, e.g., liking “Salvador Dali” or “meditation,” showed a high degree of openness.

Users of the myPersonality app were then given the option of inviting friends and family to judge the psychological traits of the user through a shorter version of the personality test.

These were the human judges in the study — those listed on Facebook as friends or family expressing their judgment of a subject’s personality using a 10-item questionnaire.

Researchers analyzed a sample of 17,622 participants judged by one friend or family member, and a sample of 14,410 judged by two.

To gauge the accuracy of these measurements, the online personality judgments were corroborated with a meta-analysis of previous psychological studies which looked at how people’s colleagues, family and so on judge their personality.

Researchers found their online values similar to the averages from years of person-to-person research.

In this way, the researchers were able to come up with accuracy comparisons between computer algorithms and the personality judgments made by humans. Given enough Likes, the computers came closer to a person’s self-reported personality than their brothers, mothers or partners.

Dr. Michal Kosinski, co-author and researcher at Stanford, said machines have a couple of key advantages that make these results possible: the ability to retain and access vast quantities of information, and the ability to analyze it with algorithms — the techniques of “Big Data.”

“Big Data and machine-learning provide accuracy that the human mind has a hard time achieving, as humans tend to give too much weight to one or two examples, or lapse into non-rational ways of thinking,” he said.

Nevertheless, the authors concede that detection of some traits might be best left to human abilities, those without digital footprints or dependent on subtle cognition.

Researchers believe that automated, accurate, and cheap personality assessments could improve societal and personal decision-making in many ways, from recruitment to romance.

“The ability to judge personality is an essential component of social living, from day-to-day decisions to long-term plans such as whom to marry, trust, hire, or elect as president,” said Cambridge co-author Dr. David Stillwell.

“The results of such data analysis can be very useful in aiding people when making decisions.”

Youyou said, “Recruiters could better match candidates with jobs based on their personality; products and services could adjust their behavior to best match their users’ characters and changing moods.

“People may choose to augment their own intuitions and judgments with this kind of data analysis when making important life decisions such as choosing activities, career paths, or even romantic partners. Such data-driven decisions may well improve people’s lives,” she said.

Similar forms of data mining and its inferences are already occurring by some digital service providers, say the researchers.

However, the researchers agree that for many people a future in which machines read our habits as an open book on a massive scale may seem dystopian to those concerned with privacy.

“We hope that consumers, technology developers, and policymakers will tackle those challenges by supporting privacy-protecting laws and technologies, and giving the users full control over their digital footprints,” said Kosinski.

Source: Cambridge University

Computers Better Than Humans for Assessment of Personality?

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2018). Computers Better Than Humans for Assessment of Personality?. Psych Central. Retrieved on September 28, 2020, from
Scientifically Reviewed
Last updated: 8 Aug 2018 (Originally: 14 Jan 2015)
Last reviewed: By a member of our scientific advisory board on 8 Aug 2018
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