The Dark Triad and BIS/BAS: a Meta-Analysis

Are there any temperamental predispositions to developing a dark personality traits? Within the current paper we address this question by investigating relations between the temperamental traits of the behavioural inhibition and approach systems (BIS and BAS, respectively) and the Dark Triad traits of personality. For this purpose, we conducted a meta-analysis of 18 studies with a total of 8911 participants. The results partially corroborated existing claims that the Dark Triad traits are a group of high-approach low-avoidance temperamental traits; however, the role of BAS seems to be more important. Among the Dark Triad traits, narcissism seems to be the most related to both the BIS and the BAS. Psychopathy in turn seems to be mostly related to the fun-seeking facet of the BAS. Finally, Machiavellianism appears to be the least related to temperamental traits. Thus, it seems that only narcissism and psychopathy confirm the claim about a connection between the Dark Triad traits and a high-approach low-avoidance temperament.

Temperament is defined as a relatively consistent, basic and inherent disposition that underlies and modulates the expression of activity, emotionality and sociability among people. Temperament is measurable in early life, and the majority of its elements seem to be strongly influenced by biological factors (Shiner et al. 2012). But are there any temperamental predispositions that could develop into a particular personality, such as a dark personality, that isthose characterized by socially aversive traits falling in the normal range (Paulhus 2014)? The aim of the current study was to investigate the temperamental foundation of the Dark Triad traits of personality: narcissism, Machiavellianism, and psychopathy (Paulhus and Williams 2002).

Behavioural Inhibition and Approach Systems as Basic Dimensions of Temperament
Theoretical neurobiological systems have been introduced to explain the links between biology, personality traits, and various disorders: depression, anxiety, drug abuse and dependence, alcohol abuse and dependence, attention deficit hyperactivity disorder, and conduct disorder (e.g., Carver and White 1994;Johnson et al. 2003;Ross et al. 2009). In this vein, Gray (1987) defines personality traits as individual differences connected to the reactivity of two basic, separate, brainmotivation systems responsible for behaviour regulation: the aversive and the appetitive motivation systems. Associated with hippocampal activity, the aversive motivation system, named the behavioural inhibition system (BIS; Gray 1987), is responsible for controlling the feelings of anxiety that arise through the influence of specific stimuli. This system is sensitive to the signals of punishment and lack of reward, which in effect leads to not achieving one's goals; consequently, it is strongly associated with negative emotions such as fear, anxiety and frustration (Corr 2004;Corr and McNaughton 2008). The behavioural activation system (BAS; Gray 1987) is associated with dopaminergic function and controls appetitive motivation. This system is sensitive to positive signals, reward and avoidance of punishment, and its activation regulates targeted behaviours; consequently, it is related to positive emotions such as hope and satisfaction (Corr 2004). Carver and White (1994) pointed out the diversity within the BAS system and distinguished three correlated subsystems: seeking pleasure (Fun Seeking), sensitivity to the prize (Reward Responsiveness) and operation (Drive) (e.g., Leone et al. 2001). More precisely, the three differentiated factors of the BAS comprise: the desire for new rewards and a willingness to immediately approach rewarding events (BAS-Fun); the tendency to focus on positive responses to the occurrence or anticipation of reward (BAS-Reward); and the tendency for the persistent pursuit of desired goals (BAS-Drive) (Carver and White 1994;Cogswell et al. 2006;Cooper et al. 2007;Smits & Boeck 2006). Although such differentiation does not reflect the theoretical assumptions of the original concept of Gray (1987), some scholars suggest that specific cues of punishment and reward are also important (Cogswell et al. 2006;Heubeck et al. 1998;Jorm et al. 1999;Leone et al. 2001;Ross et al. 2002).
The BIS and BAS, as neurobiological systems responsible for behaviour, are theoretically related to many psychopathologies (Johnson et al. 2003) but also to typical personality traits (Smits & Boeck 2006). According to the literature, there are three socially aversive yet non-clinical traits of personality -Machiavellianism, narcissism and psychopathycommonly referred to as the Dark Triad of personality (Paulhus and Williams 2002).

The Dark Triad of Personality -Phenotypical Descriptions and Ongoing Controversies
The Dark Triad traits are defined primarily by a tendency to be insensitive and unemphatic (Paulhus 2014). More specifically, Machiavellianism refers to an interpersonal trait with a predisposition to have a high motivation and skills to use manipulative tactics in relation to others. Moreover, people scoring high on Machavellianism possess a cynical worldview, detach themselves from conventional morality and are successful in strategic planning (Jones and Paulhus 2009). Thus, they are strongly motivated to achieve their long-term goals without considering any harmful consequences (Christie and Geis 1970;Jakobwitz and Egan 2006). Individuals characterized by high levels of psychopathy tend to use manipulative skills but, unlike those scoring high on Machiavellianism, are more impulsive and prefer risk-taking behaviour and short-term deceiving. This often leads to criminality and can cause serious harm (Jones 2014;Paulhus 2014;Paulhus and Williams 2002). The difference between individuals scoring high on psychopathy and Machiavellianism might be thus hypothesized in their levels of intelligence (Cattell 1963). Although the meta-analysis of O' Boyle et al. (2013) suggested that there are no associations between Dark Triad traits and crystallized intelligence, some scholars argued that the associations with fluid intelligence are different (Bereczkei 2018), Machiavellianism being positively related and psychopathy negatively related to intelligence (Kowalski et al. 2018). Finally, a person scoring high on narcissism can be described as having predisposition and willingness to being simultaneously grandiose, entitled and dominant (Emmons 1987). However, narcissism seems to be different from Machiavellianism and psychopathy (Rogoza andCieciuch 2017, 2018). According to the Narcissistic Admiration and Rivalry Concept (Back et al. 2013;Back 2018) agentic and antagonistic components of narcissism can be differentiated, leading to an understanding of convergence to and divergence from the Dark Triad. Empirical studies reveal that whereas the antagonistic component of narcissism is closely related to Machiavellianism and psychopathy, the agentic component is not (Rogoza et al. 2019). Research on the Dark Triad is primarily focused on the agentic aspects of narcissism, with its antagonistic expressions covered only to a limited extent (Back 2018;Rogoza et al. 2019).
Although research on the Dark Triad is flourishing (Furnham et al. 2013), it cannot be determined unambiguously whether the three traits are actually separate constructs: existing research suggests contradictory conclusions (e.g., Jones and Paulhus 2017;Miller et al. 2017). Some scholars have demonstrated that the three traits are moderately intercorrelated ( (Rogoza et al. 2019). More research is therefore needed to increase our understanding of these dark traits of personality characteristics. Temperamental traits may be seen as an initial basis for disposition and personality development (Rothbart et al. 2000), including Dark Triad traits; therefore, studying their relations may serve as a step towards better understanding of the underlying foundations of dark traits of personality.

Literature Search
A few studies examining the relationship between the Dark Triad and the BIS/BAS suggest that the temperamental foundation of dark traits of personality lies in a low BIS and a high BAS (Sellbom and Glenn 2015). To scrutinize this issue in greater detail, we conducted a meta-analysis using major electronic databases (such as PsycINFO, PsychArticles and Google Scholar) to locate the articles for inclusion. Keywords BDark Triad^, Bnarcissism^, BMachiavellianism^, Additionally, the reference sections of the articles found by the initial search were scanned to see if further articles could be located in this fashion. The study search was finalized in December 2018 with 24 possible studies, including one unpublished article (which was not used in the meta-analysis).
No studies published in so-called 'predatory journals' were included in the meta-analysis.

Inclusion and Exclusion Criteria
To be included in the systematic review, a study needed to report empirical research and examine the relations between a Dark Triad trait or facet and a BIS/BAS traitwe found 24 potentially relevant studies that reported zero-order correlations. We excluded six studies that used a multidimensional measure of the Dark Triad traits but did not provide a correlation for the domain score. We did not place any restrictions on the type of sample used in a study (e.g., clinical, college, online, etc.). If an article reported relevant relations using several samples, each sample was treated as an independent sample. If an article reported multiple correlations, only one, obtained by using the most popular measure of the trait, was chosen for the meta-analysis (see Table 1). For example, if an article reported a few measures of narcissism, we took the correlation reported for NPI, as it is a questionnaire most commonly used in other studies. Finally, 18 articles were selected and included within the meta-analysis, providing a total of 21 independent samples. Studies used in the meta-analysis that are not cited in the text are marked by * in the reference list.

Meta-Analysis Procedure
We used Hedges and Olkin's (1985) method for calculating the weighted summary correlation coefficient under the fixed- The BIS/BAS reliability is listed as follows: BIS|BAS|Drive|Reward|Fun; N/A = The reliability estimate was not reported. SD3 -Short Dark Triad; NPI -Narcissistic Personality Inventory; DTDD -Dirty Dozen; PNI-G -Pathological Narcissism Inventory-Grandiose Narcissism; APSD -Antisocial Process Screening Device; FFNI-G -Five Factor Narcissism Inventory-Grandiose Narcissism; NGS -Grandiose Narcissism Scale; SRP-III -Self-Report Psychopathy Scale Version III; PPI -Psychopathic Personality Inventory; YPI -Youth Psychopathic Traits Inventory; MACH-IV -Machiavellianism Scale; FFMI -Five Factor Machiavellianism Inventory a Correlations are given for the average of narcissism/psychopathy/Machiavellianism effects model, using a Fisher Z transformation of the correlation coefficients (DerSimonian and Laird 1986). To investigate whether there was a significant variation across studies in the estimates of effect size, the Q statistic was calculated as a summed squared deviations of each study effect estimate from the overall effect estimate, weighting the contribution of each study by its inverse variance (Huedo-Medina et al. 2006). Significant values of the Q statistic (which follows chi-square distribution with k -1 degrees of freedom, where k reflects the number of studies) indicate non-random variation in effect size estimates across the (homogenous) samples, which allows to assume that the estimated effect sizes only differ by sampling error. All of the results are presented, along with 95% confidence intervals.

Results
Zero-order correlation estimates between the Dark Triad traits and the BIS/BAS, a sample description and the measures used are presented in Table 1, and the results of the meta-analysis of these estimates are presented in Table 2. Moreover, three Fig. 1 The results of meta-analysis for narcissism (estimates with confidence intervals) Fig. 2 The results of meta-analysis for psychopathy (estimates with confidence intervals) Fig. 3 The results of meta-analysis for Machiavellianism (estimates with confidence intervals) forest plots of the meta-analytic results (Figures 1, 2, and 3) were preparedone for each trait of the Dark Triad of personality.
The BIS/BAS were most frequently analysed in the context of narcissism (number of studies k = 16), and the fewest studies (k = 5) reported their relations to Machiavellianism. The subjects examined most often were university students. In all of the analysed studies the participants were administered the BIS/BAS (Carver and White 1994); to measure the Dark Triad they were usually administered the Narcissistic Personality Inventory (NPI; Raskin and Hall 1979) for narcissism, the Psychopathic Personality Inventory (PPI; Lilienfeld and Andrews 1996) for psychopathy and the MACH-IV (Christie and Geis 1970) for Machiavellianism. Estimates obtained from the meta-analysis suggest that narcissism and psychopathy are negatively related to the BIS whereas Machiavellianism is unrelated. Subsequently, the BAS relations with the Dark Triad were all significant and positive: the effect size was strongest for narcissism and weakest for Machiavellianism. With respect to the BAS components, effect sizes of BAS-Drive were all significant and positive (strongest for narcissism and weakest for Machiavellianism); BAS-Reward turned out to be virtually unrelated to the Dark Triad (with only one significant but low result for narcissism); and BAS-Fun was positively related to all traits (with the strongest relation to psychopathy and the weakest to Machiavellianism).

Discussion
According to the results of the meta-analysis, the claim that the Dark Triad may generally be described in terms of a low BIS and a high BAS (Sellbom and Glenn 2015) was partially confirmed. Nevertheless, the role of the BAS seems to be more important in explaining the Dark Triad traits. Narcissism seems to be the most connected to the BIS/BAS amongst the Dark Triad traits, which is in line with theoretical models of narcissism outlining the role of temperamental traits in the explanation of narcissistic trait of personality (Krizan and Herlache 2018). Approach orientation is also central to Campbell et al. (2006) agentic model of narcissism, which is viewed by the dynamic self-regulatory processing model as an important concept for understanding narcissism (Morf and Rhodewalt 2001). In this vein, persons high on the narcissism scale appear to have a strong motivation towards being rewarded and simultaneously being weakly motivated by punishment (Foster and Trimm 2008;Foster et al. 2009).
The only dimension of the BAS in which psychopathy gained higher results than narcissism was Fun Seeking: reflecting a tendency both to seek out new potentially rewarding experience and to act on the spur of the moment. Narcissism and psychopathy have both been linked to impulsivity (Jones and Paulhus 2011;Vazire and Funder 2006); people with a high level of narcissism tend to focus overly on positive outcomes and highly care about their self-promotion, whereas individuals with a high level of psychopathy tend to act irresponsibly and aggressively, ignoring the outcomes and experiencing diminished aversive conditioning (Flor et al. 2002) and reduced fear-potentiated startle (Patrick 1994), which might explain the observed relations with Fun Seeking.
Contrary to the observed relations between narcissism/ psychopathy and temperamental traits, Machiavellianism turned out to be the least related to the BIS/BAS out of the Dark Triad traits. First of all, Machiavellianism is less strongly associated with impulsivity than narcissism or psychopathy (Jones and Paulhus 2011). Moreover, genetic investigations of the Dark Triad traits suggested that, whereas narcissism and psychopathy were largely heritable, Machiavellianism was inherited to a lesser extent. When environmental effects were considered, these explained most of the variance in Machiavellianism ). Thus, one might hypothesize that, among the Dark Triad traits, Machiavellianism is least related to the biologically rooted temperamental foundations and might be developed in response to environmental effects.
The results obtained in the meta-analysis can also be interpreted in terms of the Five-Factor Model of personality (McCrae and Costa 1997). Existing meta-analyses and behavioural genetic studies reveal that psychopathy and Machiavellianism are both primarily related to low agreeableness, whereas narcissism is related to higher extraversion and partially to low agreeableness (Muris et al. 2017;O'Boyle et al. 2015;Rogoza 2018;Vernon et al. 2008). The BIS is primarily related to high neuroticism and then to high agreeableness (Donnellan et al. 2006;Keiser and Ross 2011), whereas the BAS is mostly related to high extraversion. With regard to the BAS facets, Reward Responsiveness demonstrated least association with the personality traits, whereas Fun Seeking and Drive were negatively associated with agreeableness (Segarra et al. 2014;Smits & Boeck 2006). It is not surprising, therefore, that the Dark Triad traits were all related negatively to the BIS (due to relation with low agreeableness) and positively to the BAS (due to relation with high extraversion and low agreeableness). Moreover, the current results explain why Reward Responsiveness was least related to the Dark Triad traitsbecause it is also unrelated to the basic personality traits. In summary, the current findings fit within the broader description of personality provided by the Five-Factor Model.

Limitations
Our meta-analysis is not free from limitations. As some researchers mentioned (Krizan and Herlache 2018;Patrick et al. 2009), the Dark Triad traits are multidimensional constructs but in our study we analysed only the domain scores of the questionnaires, thus the conclusions can only be applied to an overall view of the temperamental foundations of the Dark Triad traits. Our findings are also mostly limited to the population of Western undergraduate students. Furthermore, the questionnaires used to measure the Dark Triad traits were different in the majority of the research. The fact that the meta-analysis was based on self-report measures might be treated as another limitation due to the discrepancy in how narcissistic individuals see themselves compared to their true scores (Zajenkowski and Czarna 2015).

Conclusions
To summarize, the results of the meta-analysis presented in this paper systematize the knowledge on the temperamental foundations of dark traits of personality. Although the Dark Triad traits were generally described in terms of a high-approach low-avoidance temperament (Sellbom and Glenn 2015), our results confirmed this assumption only partially. Narcissism and psychopathy indeed reflected such an assumption but Machiavellianism had very little relation to temperamental traits. With regard to the facets of the BAS, BAS-Reward turned out to be the least related to the Dark Triad traits whereas BAS-Drive was the most strongly related.
Funding Information This study was funded by Polish National Science Center (grant number 2015/19/N/HS6/00685).

Compliance with Ethical Standards
Conflict of Interest Katarzyna A. Włodarska declares that she has no conflict of interest. Emilia Zyskowska declares that she has no conflict of interest. Martyna K. Terebus declares that she has no conflict of interest. Radosław Rogoza declares that he has no conflict of interest.
Ethical Approval All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
Informed Consent Informed consent was obtained from all participants included in the study.
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