The HEXACO Model of Personality from an Evolutionary Perspective

From an evolutionary perspective, the existence of personality differences presents a puzzle. Natural selection tends to weed out variation that deviates from optimal adaptations. Therefore, how are personality differences maintained in local environments?

In September’s edition of Evolution & Human Behavior, psychologist Reinout E. de Vries and his colleagues present a general framework which addresses this puzzle. In the process, the authors review the latest scientific developments in personality psychology, and attempt to explain the origins of personality differences.

The authors contend that individual differences likely arose because different situations favour different personality traits. From an evolutionary perspective, the fitness pay-offs of phenotypes vary across time and place.

However, what exactly are these traits that vary across individuals?

Although the authors provide an extensive review of competing models of personality, I will limit the overview to the most robust models in personality psychology.

The Big Five

Psychology has moved on from the days of psychoanalytic personality topographies. Rather depressingly however, there remains plenty of demand for such personality tests in the business world.

Rather than there being fixed categories of personalities, a convergence of evidence from various sources supports the existence of at least five independent dimensions of personality. This research accumulated into the Big Five model of personality, with the five factors being: openness, conscientiousness, extroversion, agreeableness and neuroticism (inversely, emotional stability).

Each factor is composed of traits with characteristics indicating high and low levels of the personality dimension. Studies suggest that these five factors are normally distributed, and are largely stable throughout a person’s lifetime.

Due to it’s high validity and reliability, the Big Five has long been considered the gold standard of personality testing.

Despite the model’s credentials, researchers have since identified some limitations of the Big Five. Most importantly, the authors argue that the Big Five has limited ability to identify dark triad personalities. That is, crucial aspects of personality such as psychopathy, narcissism, and Machiavellianism,  are not well detected by the Big Five model.

This shortcoming led to the development of a new model of personality: the ‘HEXACO model’.

The HEXACO Model

De Vries and his colleagues state that although the HEXACO model is broadly aligned with the Big Five, there are also noticeable differences. The most significant difference is that the HEXACO model includes honesty/ humility added as sixth independent factor of personality.

The authors define honesty/ humility as traits pertaining to sincerity, fairness, greed avoidance, modesty, and inversely deceitfulness– noting that these traits are largely absent from the Big Five.

Studies comparing the two models demonstrates that with the inclusion  of honesty/humility, the HEXACO model is able to explain more variance in antisocial personality traits– including psychopathy, Machiavellianism, and narcissism. Conversely, the honesty/ humility dimension also explains more variance in prosociality, such as cooperativeness.

The authors highlight other discrepancies from the Big Five. For example, the HEXACO model’s agreeableness and emotionality partially, but incompletely, overlap with the Big Five’s dimensions of agreeableness and emotional stability. These differences have implications for both the predictive validity of both models, and for theorising about the evolution of personality.

The authors summarise the advantages of HEXACO as follows (p. 411):

In sum, when compared to the Big Five model, the HEXACO model (1) has offered a better description of the largest set of replicable factors that have emerged in comparative cross-cultural lexical research, and (2) has been found to better predict a number of important criteria, including counterproductive, delinquent, and outright criminal behaviors, sexual exploitative behaviors, and prosocial behaviors such as cooperation.

Situational Affordances

What circumstances may have led to the emergence of these dimensions of personality? Historically, psychologists have failed to address this question.

De Vries and his colleagues argue that recurrent situational challenges may have promoted the emergence of these personality dimensions.

People experience a wide range of different situations throughout their lives. However the authors argue that if situations vary reliably across time and location, then different personality traits that fit well (or poorly) with these situations will emerge.

Following from a review of the literature on ‘situational affordances’, De Vries and his colleagues develop a framework for the evolution of personality.

The framework outlines the six domains of situational affordances, and maps the relevant personality dimension which addresses such challenges.

For example, some situations allow for personal gain at the expense of others, or allow for behaviours that are beneficial to others. In situations that that permit exploitation, the authors propose that low honesty/ humility behaviours are more likely to pay-off. However strategies employed by people low in honesty/ humility in stable or supervised environments are likely to be punished and suffer consequences.

De Vries et al (2016) The situational affordances framework of personality evolution

The situational affordances framework of personality evolution (De Vries et al, 2016, p. 414)

By testing the propositions laid out in their situational affordances framework, the authors contend that  “further progress can be made in unravelling the ‘enigma of personality’.” (p. 418).

What’s the relevance to business?

Intuitively, low levels of honesty/ humility is associated with work place delinquency (e.g. steeling from your employer).

Research suggests that people high in honesty/ humility have more negative views on theft, and report stealing less money than their less honest counterparts. Additionally, honesty/ humility predicts supervisor ratings of workplace performance, above and beyond ratings of the other five factors of personality.

Appreciating its predictive power in identifying dark triad personalities and workplace delinquency, organisational psychologists and recruitment specialists should make it a priority to measure candidates’ levels of honesty/ humility during the recruitment process. Even if HR professionals are adhering to best practice and using models based on the Big Five taxonomy, they may still be omitting one of the most important aspects of personality.

To put it another way, a combination of low honesty/ humility, low conscientiousness and low agreeableness is the nightmare of every employer. Scientific personality assessments can help prevent such nightmares becoming a reality

Written by Max Beilby for Darwinian Business

Click here to read the full paper. 

de Vries, R. E., Tybur, J. M., Pollet, T. V., & van Vugt, M. (2016). Evolution, situational affordances, and the HEXACO model of personality. Evolution and human behavior, 37(5), 407-421



Ashton, M. C., Lee, K., & de Vries, R. E. (2014). The HEXACO Honesty-Humility, Agreeableness, and Emotionality factors: A review of research and theory. Personality and Social Psychology Review, 18(2), 139-152

Chamorro-Premuzic, T. (2017) The Talent Delusion: Why Data, Not Intuition, Is the Key to Unlocking Human Potential. Piatkus

de Vries, R. E. (2016). The nightmare of every employer: The explosive mix of low Honesty Humility, low Conscientiousness, and low Agreeableness. GEDRAG & ORGANISATIE, 29(4), 316-346

Grant, A. (2013). Goodbye to MBTI: The fad that won’t die. Psychology Today. Available here

Johnson, M.K., Rowatt, W. C., & Petrini, L. (2011). A new trait on the market: Honesty-Humility as a unique predictor of job performance ratings. Personality and Individual Differences, 50, pp. 857-862

Miller, G. (2009). Spent: Sex, evolution, and consumer behavior. Penguin.

Pinker, S. (2003). The Blank Slate: The modern denial of human nature. Penguin.


Charismatic Leadership Through the Lens of Evolution

One of the defining features of human psychology is our extraordinary prosociality. How can cooperation and prosocial behaviour be maintained, despite the immediate temptations to free-ride and deflect?

In a paper published in the September edition of the journal Evolution & Human Behavior, organisational psychologists Allen Grabo and Mark van Vugt explore the origins and functions of charismatic leadership.

Charismatic leaders have played a prominent role throughout history, and yet a definition of what charismatic leadership actually is remains elusive.

The authors argue that the ultimate function of charismatic leadership is to effectively promote and sustain prosocial behaviour within groups. Using the terminology of evolutionary psychology, the authors contend charismatic leadership is “[…] a signalling process in which a leader conveys their ability to solve urgent coordination and cooperation challenges in groups”.

They continue:

This process is context-dependent, but fundamentally consists of (1) attracting attention to recruit followers, (2) making use of extraordinary rhetorical abilities and knowledge of cultural symbols and rituals to inspire and offer a vision, (3) minimizing the perceived risks of cooperation, and (4) aligning these followers toward shared goals.

Grabo and van Vugt suggest charismatic leadership helps foster group cohesion, even as populations grow larger and less kin-based than those of our hunter-gather ancestors.

The Charismatic Prosociality Hypothesis

Three studies were conducted to test the ‘charismatic prosociality hypothesis’. The authors recruited participants online, and used charismatic stimuli and experimental economic games to test it.

For the first two studies, the researchers capitalised on the wealth of TED talks available, and identified videos which viewers found similarly interesting but were presented by speakers scoring high or low in charisma. Participants watched either a high or  low charisma scoring TED talk, before participating in experimental economic games: the ‘Dictator‘ and ‘Trust‘ Games.

Participants who had watched the more charismatic TED talk gave more in the Dictator Game than the participants in the non-charismatic condition. For those playing the Trust Game, the Trustees behaved more pro-socially  (returned more of an initial amount sent by the first player) in the charismatic condition, versus the non-charismatic condition.

To test the generalizability of the effects observed in the initial studies, the authors made use of an entirely different ‘charismatic manipulation’. The authors instead primed participants by asking them to imagine a charismatic (or non-charismatic) individual, and to write a short description about this person. Afterwards, the primed respondents participated in the experimental economic games. The authors added ‘The Stag Hunt‘ Game, which measures cooperation in a more abstract way than the strict allocation of money.

The increased prosocial behaviour observed  in the high charisma condition within the Dictator and Trust games was replicated with the prime. In the Stag Game, participants in the charismatic condition were more likely to cooperate than those in the non-charismatic condition.

Overall, the findings provide initial evidence for the theory of charismatic leadership being an instrument to galvanise cooperation and prosociality among strangers.

A limitation of the research methodology arguably further supports the hypothesis: that the studies were confined to online experiments. One would expect significantly stronger prosocial effects when people are exposed to charismatic leaders in naturalistic settings.

The Dark Side of Charismatic Leadership

Of course, the authors focused on the positive aspects of charismatic leadership. Charisma has a dark side, which Grabo and van Vugt acknowledge.

The present article focuses exclusively on the positive effects of charismatic leadership, but this is by no means the entire story. In fact, there is much more to be said about the “dark side” of charismatic leadership, the dangers which can result when a leader takes advantage of the extreme devotion and commitment of followers for selfish or immoral reasons by signaling dishonestly their intentions to benefit the group. History is full of examples of individuals, such as cult members or suicide bombers, who were unable to abandon their commitment to a charismatic leader even in the face of conflicting information, with disastrous outcomes. One way of understanding such actions is to view them as the results of an evolved “psychological immune system” which functions to defend firmly held convictions against change by novel information. While such a system might have been beneficial for group cohesion in the past – when contact with outgroup members was rare and perhaps more dangerous – it is perhaps best considered an evolutionary mismatch in the modern world.

Click here to read the full paper

Post written  by  Max Beilby for Darwinian Business

You can read Max’s review of Mark van Vugt and Anjana Ahuja’s book  Selected: Why some people lead, why others follow, and why it matters here