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Group Processes & Intergroup Relations

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461835 16110.1177/1368430212461835Group Processes & Intergroup RelationsEmery et al. 2013

1London School of Economics and Political Science, UK 2University of Edinburgh, UK 3Pontificia Universidad Católica de Chile, Chile

Corresponding author: Cécile Emery, Department of Management, London School of Economics and Political Science, Houghton Street, London WC2A 2AE, UK. Email: [email protected]

Traditionally, leadership theory and research has been predominantly leader-centered, driven by the search for the profile of the good leader (for a review, see Judge, Piccolo, & Kosalka, 2009). More recently, some researchers have adopted a fol- lower-centered approach and argued that without followers there can be no leadership, and that fol- lowers play a key role in constructing and endors- ing the leader (Meindl, 1995; Schyns & Felfe, 2006). Although both of these research streams

have provided major insights about both lead- ers and followers, by largely adopting an

Leadership as an emergent group process: A social network study of personality and leadership

Cécile Emery,1 Thomas S. Calvard,2 and Meghan E. Pierce3

Abstract A longitudinal study was conducted on the social network of a leaderless group to explore how Big Five personality traits affect leadership emergence, in the form of receiver ties (being nominated as a leader), sender ties (nominating others as leaders), and similarity effects (nominating similar/different others as leaders). Forty one students on a 3-month study abroad program participated in intensive group work, and their perceptions of emergent task- and relationship-oriented leadership within these groups were assessed three times across the life cycle of the group. Results indicated that individuals scoring higher on extraversion, openness to experience, and conscientiousness were nominated more as task- and relationship-oriented leaders, whereas those who were more agreeable were more likely to emerge as relationship-oriented leaders. In terms of emergent followership, group members who were more agreeable and neurotic (and less open to experience) were less likely to follow relationship- oriented leaders, whereas more conscientious individuals were more likely to follow task-oriented leaders. With respect to the effects of complementarity and similarity, both task- and relationship- oriented leader nominations were based on dissimilar levels of agreeableness between leaders and followers, whereas nominated relationship-based leaders tended to have similar levels of openness to experience to followers. Implications of these results are discussed.

Keywords emergent leadership, social network analysis, Big Five, personality

Paper received 11 February 2012; revised version accepted 21 August 2012.

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Emery et al. 29

individualistic approach they have failed to cap- ture an essential quality of leadership. Namely, that leadership (and followership) is a dynamic process that is played out in a group context, shaped by the interactions of multiple interdependent actors (DeRue & Ashford, 2010; Uhl-Bien, 2006).

The current article attempts to address this important issue by simultaneously examining emergent leadership and followership as an inter- active group process. More specifically, the aim of this study was to examine the extent to which group members’ personality traits (as measured by the “Big Five”) predicted the emergence of leaders and followers in the context of leaderless or self-managing groups. Although no formal leaders (or followers) are appointed in such groups, there is an implication that one or potentially several leaders will dynamically emerge, as recog- nized by other groups members, and this is how emergent leadership is typically defined (Taggar, Hackett, & Saha, 1999). In parallel, followers naturally emerge by group members attributing a leadership role to others in the group, and this is how we defined emergent followership. Thus, leaderless groups are an ideal context for assess- ing group members’ perceptions of emergent leadership and followership as they unfold over the life cycle of the group.

The present investigation extended previous research on leadership and followership in a num- ber of important ways. First, we adopted a more fine-grained approach to conceptualizing our key dependent variable, leadership emergence, by dis- tinguishing between two theoretically important kinds of leadership behavior: task- and relation- ship-oriented leadership (Cartwright & Zander, 1960; DeRue, Nahrgang, Wellman, & Humphrey, 2011; Hemphill & Coons, 1957). Second, past research has focused mainly on the impact of lead- ers’ personality on leadership emergence per se, whereas the present study explains the emergence and endorsement of task-and relationship-oriented leadership in terms of followers’, as well as leaders’ personalities. More specifically with respect to research on followership, it is only recently that researchers have recognized the role of followers’ personalities in shaping perceptions of leadership,

especially transformational leadership (e.g., see Felfe & Schyns, 2010). Our study, however, was the first to link followers’ Big Five personality traits to perceptions of task- and relationship-oriented lead- ership. Third, our design was longitudinal. To our knowledge, it was the first study to examine the impact of personality on emergent leadership and followership not only as it evolves over time, but across the entire life cycle of a group.

Our final and most important contribution was to go beyond standard individualistic approaches to leadership by adopting a relatively new social network approach to leadership that treated leadership as a shared (group) phenomenon. Specifically, shared leadership is defined “as an emergent team property that results from the dis- tribution of leadership influence across multiple team members” (Carson, Tesluk, & Marrone, 2007, p. 1218), and argues for a more dynamic, interactive process of mutual adjustment and role occupation with respect to leadership within groups (Day, Gronn, & Salas, 2004; Pearce, Conger, & Locke, 2007). As such, this approach allows for the emergence of multiple leaders and more complex distributed leadership structures in groups (Carson et al., 2007; Mehra, Smith, Dixon, & Roberston, 2006). In the current study, we extended research on shared leadership by investi- gating how two distinct (task- and relationship- oriented) leadership roles can be shared among group members. Indeed, two informal leaders often emerge in leaderless groups—one to organ- ize and structure tasks and the other to support and develop relationships (Bales, 1953; Burke et al., 2006; DeRue et al., 2011). In order to understand how task and relationship leadership are progres- sively distributed within groups over time, we applied a social network approach to leadership.

Taking a Social Network Approach to Examining Emergent Leaders and Followers in Groups Social network analysis is a sociometric procedure which maps and studies interpersonal relation- ships among people (actors) in a social group

30 Group Processes & Intergroup Relations 16(1)

(Moreno, 1932, 1947). Such an approach is well suited for studying leadership that is shared and emergent because it models patterns of relation- ships among interconnected individuals, it repre- sents how leadership is distributed among group members, and identifies the emergence of multi- ple leaders (Carson et al., 2007; Mehra et al., 2006). Such leadership can be represented as a network of leadership perceptions (or “leadership net- work”) where nodes and ties represent group members and leadership perceptions respectively. At the dyadic level, the direction of the tie distin- guishes between the follower, who sends the tie (i.e., nominates a leader), and the leader, who receives the tie (i.e., is nominated as a leader). At the group level, emergent leaders are identified as the nodes receiving the greatest number of ties; follow- ers by extension are those who send the greatest number of ties. A network representation therefore treats leadership as a group process encompassing one or potentially several emergent leaders, and fol- lowers who recognize these leaders.

To explore the micropersonality dynamics that produce shared leadership at the group level of analysis (Thorpe, Gold, & Lawler, 2011), in the present study we captured a self-managing group’s task and relationship leadership networks at sequential points in time and modeled their evolution by using an advanced social network program, SIENA, developed to analyze panel network data (Snijders, 2009; Snijders, van de Bunt, & Steglich, 2010). A longitudinal network approach statistically tests, in the same analysis, whether individuals scoring higher on specific personality traits are more likely to receive increas- ing numbers of leadership nominations (i.e., emergent leaders), send increasing numbers of leadership nominations (i.e., emergent followers), and determines the process by which leaders emerge by testing if followers tend to nominate individuals who are similar to themselves (in terms of personality) as a leader. Our approach is structural, in controlling for patterns of leader and follower nominations, and processual, in looking at who sends and receives increasing leader nominations over time (Fitzsimons, James, & Denyer, 2011). Having briefly outlined the

social network approach to leadership, we next derive specific predictions about personality and leader–follower roles in the dynamic leadership network.

Emergent Leaders and Big Five: Receivers in the Leadership Network A good starting point for any theoretical account of emergent leadership is leader categorization theory or implicit leadership theory (e.g., Lord & Hall, 2003; Shondrick & Lord, 2010). Lord and colleagues posit that leader categorization involves group members interacting and estab- lishing a status structure by cognitively catego- rizing themselves and others based on social perceptions; typically inferences regarding per- sonality traits and characteristics (Lord & Hall, 2003). Both implicit leadership theories (ILTs) held by followers and implicit followership theo- ries (IFTs) held by leaders are critical for shaping a stable leadership structure that emerges over time (Shondrick & Lord, 2010).

In terms of the content of such leadership prototypes, there is considerable evidence show- ing that someone’s personality plays an impor- tant role in judging whether that person is leader-like; that is, individuals who, by receiving more leadership nominations over time, become more “popular” (central) in a leader- ship network. For example, Judge, Bono, Ilies, and Gerhardt (2002) meta-analyzed 78 trait leadership studies and found that all of the Big Five factors except agreeableness were signifi- cantly related to leader emergence (whereas neu- roticism was negatively related). More relevant to the present investigation, DeRue et al. (2011) in their meta-analysis examined the link between personality and task- and relationship-oriented leadership style in established (i.e., formally des- ignated) leaders (DeRue et al., 2011). For estab- lished leaders, conscientiousness was the strongest predictor of task-oriented leader effec- tiveness, and agreeableness and extraversion were the strongest predictors of relationship- oriented leader effectiveness.

Emery et al. 31

In the current study we addressed recent calls in the literature for a more nuanced and develop- mental approach to the study of leadership by focusing on the emergence of task- and relation- ship-oriented leadership (DeRue et al., 2011). Guided by DeRue et al.’s (2011) meta-analytic findings we expected that conscientiousness, by virtue of its links to task completion, goal set- ting, and planning, would more likely predict the emergence of task- than relationship-oriented leadership. In contrast, we expected individuals high in agreeableness to be increasingly nomi- nated as an interpersonally caring, friendship- based point of reference for the group over time, independent of any guiding structural direction of the group’s task or project. In a similar vein, we anticipated that those high in extraversion would increasingly dominate the group in a sociable and outgoing manner, and thus be viewed as relationship-based leaders as opposed to task-based leaders.

In light of these previous findings on leaders’ personalities, we hypothesized that openness to experience would be positively related to both task- and relationship-oriented leader emergence, while neuroticism would be negatively related to both styles of leadership emergence. We further anticipated that conscientiousness would be related to the emergence of task-based leader- ship, whereas both extraversion and agreeableness would be related to the emergence of relation- ship-based leadership.

Hypothesis 1a: Group members higher on openness to experience and lower on neuroti- cism will receive more nominations of task- and relationship-oriented leadership over time.

Hypothesis 1b: Group members higher on conscientiousness will receive more task-ori- ented leadership nominations over time.

Hypothesis 1c: Group members higher on extraversion and agreeableness will receive more relationship-oriented leadership nomi- nations over time.

Emergent Followers and Big Five: Senders in the Leadership Network Follower-centered approaches to leadership rec- ognize the active role of followers in the leader- ship process (Meindl, 1995; Riggio, Chaleff, & Lipman-Blumen, 2008; Schyns & Felfe, 2006) and suggest that followers’ characteristics are just as important as a leaders’ for sustaining the group as a whole (Felfe & Schyns, 2010; Kaiser, Hogan, & Craig, 2008). Moreover, in the context of a dynamic leadership network in which both the leadership and followership structure of the group (or network) naturally emerges over time, followers are likely to play an even more critical role in determining who leads and who follows.

There are compelling theoretical grounds for hypothesizing a link between individual’s person- ality and their emergence as a follower. In a logi- cal extension of leader categorization theory, Shondrick and Lord (2010) posit that people hold implicit beliefs about themselves and others as suitable followers (implicit followership theories; IFTs), with personality traits at the heart of these followership schemas. For example, a prototypi- cal follower is generally regarded as hard-working, enthusiastic, and cooperative, whereas a nonpro- totypical follower is viewed as subversive, rejects authority, incompetent, and/or conforms too much and too easily (Sy, 2010). Follower character- istics are likely to be influential by guiding choices relating to leaders; whether they conform to them, resist them, or act as an audience (Collinson, 2006). Above and beyond these more general conceptions of followership, some researchers have shown that IFTs are also contingent on leader characteristics by showing the link between certain attributes of followers and certain kinds of leadership (Ehrhart & Klein, 2001). For example, higher levels of followers’ extraversion, agreeable- ness, and emotional stability have been associated with greater recognition of transformational leadership in others (Felfe & Schyns, 2010; Schyns & Felfe, 2006). To date, however, no research has systematically investigated how followers’ per- sonality traits (as measured by the Big Five) affect

32 Group Processes & Intergroup Relations 16(1)

their perceptions of which group members appear best suited to enacting important task- and rela- tionship-related leadership functions in the group, and how these preferences change over time in the context of real group interactions. Nevertheless, this fundamental distinction between task- and relationship-based leadership has been prominent in theory and research on leadership behavior for over 50 years (DeRue et al., 2011; Judge, Piccolo & Ilies, 2004; Yukl, 2009). In the current study, by measuring the extent to which group members sent leadership ties to others in the network, it was possible to determine which group members emerged as followers over the life cycle of the group, the nature of those followers’ personality, and the particular kind of leadership they endorsed in others (i.e., task vs. relationship).

In terms of specific Big Five personality traits, agreeable individuals are regarded as altruistic, cooperative, modest, thoughtful, and considerate (McCrae & Costa, 1987). Previous research sug- gests that agreeable followers may actually be quite passive, not actively identifying as many leaders in a group (e.g., Hetland, Sandal, & Johnsen, 2008). Agreeable group members may therefore prefer to relate to other group members at a more interpersonal friendship level, and be relatively happy to let different would-be leaders take the risk of defining the group (van Vugt, Hogan, & Kaiser, 2008). For different reasons, neuroticism is also likely to undermine the emergence of fol- lowership. Neuroticism is associated with emo- tional instability, lower self-esteem, higher anxiety, and heightened insecurity (McCrae & Costa, 1987; Moss & Ngu, 2006). As such, neuroticism gener- ally interferes with healthy leader–member inter- action via worrying about unpleasantness in relationships and emotional interference (Spangler, House, & Palrecha, 2004). Furthermore, given that neuroticism is a risk factor for depression and can lead to general inactivity and disordered affective interactions (Duggan, Sham, Lee, Minne, & Murray, 1995), we expected neurotic group members to be generally less assertive, decisive, or confident about potential leaders of either form. Thus, we anticipated that more agreeable and neurotic individuals would be less likely to play an

active role in the emergence of either type of leadership in self-managing groups.

In contrast, we expected the remaining three personality factors to play a more active role in the emergence of followership. On one hand, conscientious individuals tend to be organized, responsible, and disciplined (McCrae & Costa, 1987). Given that task leadership implies organ- izing and improving activities by providing struc- ture, direction, reward/punishment, and the spanning of group boundaries (DeRue et al., 2011), conscientious individuals should be more likely to recognize and acknowledge task-related leadership behaviors in other group members (Ehrhart & Klein, 2001; Roberts, Chernyshenko, Stark, & Goldberg, 2005). Thus, conscientious followers are likely to be particularly receptive to displays of task leadership by others. However, we had no reason to expect that conscientious- ness would be related to the endorsement of relationship-oriented leadership behavior in oth- ers. In contrast, extraversion is a personality trait associated with sociability, talkativeness, high energy, dominance, and positive affect (McCrae & Costa, 1987). Research generally indicates that people high on extraversion are more likely to seek interpersonal relations with others and more extraverted followers tend to establish closer rela- tionships with their formal leaders (Phillips & Bedeian, 1994). Given that highly extraverted people are more attentive to positive social inter- actions, they may be more inclined to recognize and endorse relationship-oriented (but not task- oriented) leadership behaviors in other group members.

In a similar vein, prior research has shown that followers high on openness to experience show a preference for participatory leadership styles (Stevens & Ash, 2001). Openness to experience reflects the degree to which individuals are curi- ous, creative, driven to experience novelty, non- conformist, and accepting of diversity (e.g., McCrae & Costa, 1987; Moss & Ngu, 2006). As relationship-oriented leadership involves empow- ering, developing, inspiring, and encouraging par- ticipation amongst other group members (DeRue et al., 2011), followers more open to experiences

Emery et al. 33

may be more likely to recognize and endorse this kind of leadership displayed by other group members. Given that those higher in openness tend to be higher in divergent thinking and sensa- tion seeking (Aluja, Garcı'a, & Garcı'a, 2003; McCrae, 1987), they may not be particularly atten- tive to the coordination of group task structure, so we expected no relationship with perceptions of task-based leadership in others.

To summarize, it was expected that group members who were more agreeable and neurotic would send fewer nominations of task- and rela- tionship-oriented leadership over time (i.e., they will be less likely to emerge as followers). In terms of those more likely to emerge as followers, it was predicted that those higher in extraversion and openness to experience would send more rela- tionship leadership nominations, whereas those higher in conscientiousness would send more task leadership nominations over time.

Hypothesis 2a: Group members higher on agreeableness and neuroticism will send fewer nominations of task- and relationship-oriented leadership over time.

Hypothesis 2b: Group members higher on extraversion and openness to experience will send more relationship-oriented leadership nominations over time.

Hypothesis 2c: Group members higher on conscientiousness will send more task-oriented leadership nominations over time.

Leader–Follower Similarity In addition to the personality of leaders who are most frequently nominated in the group and the personality of followers who are most likely to nominate particular leaders, the third and final component of leadership as an emergent group process is the interplay between leaders’ and fol- lowers’ personalities and the emergence of fol- lowership. More specifically, to what extent do followers nominate leaders with similar, as opposed to dissimilar, personality profiles?

The evidence regarding followers’ preference for similarity versus complementarity of leader– follower personality is mixed. Furthermore, per- suasive theoretical arguments can be made for predicting either effect. On the one hand, both the similarity-attraction hypothesis and social identity theory (Hogg, 2001) posit that followers nominate leaders who they perceive to be similar to themselves because of enhanced likability, reduced dissonance, and the general self-esteem benefits of being able to more easily project and confirm positive aspects of one’s own self- concept via a prototypical ingroup member (Ehrhart & Klein, 2001; Felfe & Schyns, 2010). Research in support of this argument found that personality similarity was positively related to bet- ter leader–member exchange relationships (Bauer, Green, & Bauer, 1996). Eagleson, Waldersee, and Simmons (2000) demonstrated that individuals are more likely to select those with a leadership style similar to their own as leaders for a manage- ment team. Furthermore, Felfe and Schyns (2010) found that perceptions of a similar leader person- ality mediated the relationship between follower personality and the recognition of transforma- tional leadership.

On the other hand, there are also good rea- sons to expect that leaders and followers will prefer complementarity over similarity. Recent theories of leadership argue that social interac- tions include leaders and followers claiming, signaling, and granting distinct identities as they mutually adopt differentiated roles over time, drawing attention to complementary differences (DeRue & Ashford, 2010). Thus, individual dif- ferences can be used to meaningfully differentiate and provide self-esteem support between group members by satisfying a need for optimal distinc- tiveness (Brewer, 1991). Similarly, self-verification theory would suggest that group members with different leader- and follower-relevant personality characteristics will seek to enact corresponding leader–follower roles and appreciate it more if their differences are mutually acknowledged, con- firming or verifying personal aspects of their self- concepts in a self-consistent fashion (Riley & Burke, 1995). Furthermore, leaders may be

34 Group Processes & Intergroup Relations 16(1)

nominated precisely because they are different from the follower, and can therefore satisfy or ful- fill a need for a particular quality that the follower is lacking (Ehrhart & Klein, 2001).

In summary, given the ambiguity of the previ- ous theoretical and empirical evidence, we made no specific predictions concerning the associa- tion between leader–follower (dis)similarity and the sending of both task- and relationship-oriented leadership nominations.

Method

Sample The participants for this study were 41 undergrad- uate students involved in a 3-month study abroad program1. There were 27 female and 14 male par- ticipants with ages ranging from 20 to 22 (M = 20.6 years, SD = 0.5). The sample was homogene- ous in terms of ethnic background (White North American). Only a few of the participants were friends before joining the program. All partici- pants accepted to take part in our study, resulting in no missing data.

The program combined classroom instruction with real-world projects, and required participants to travel extensively throughout Europe and live in the same accommodation for 3 months. Each month, participants were evaluated on their performance on specific classroom projects. Participants worked in groups (average of six people per team) for each project (three in total). Projects were designed to be challenging, involv- ing data collection, analysis, presentations, and a final report. Performance on these group projects constituted a major part of their course work (counting for up to 100% of their grade). It is in the context of these classroom projects, where teams had to dedicate a significant amount of time and energy to reach their project’s objectives that task- and relationship-oriented leadership emerged: some individuals had to step up and exert a significant influence over their group to achieve their common goal (Northouse, 2007). For the purpose of our study, we collected network data at three separate points in time, 1 month apart.

Each round of data collection corresponds to the end of a classroom project. Participants were asked to look back at their class-related experi- ence and report on different types of social interactions.

Measures Dependent Variables: Leadership Net- works To study leadership emergence in the self-managing group described before, we used a sociometric approach to capture how leadership may be shared among multiple leaders (Carson et al., 2007; Mehra et al., 2006; Moreno, 1932). Par- ticipants were provided with a definition of lead- ership and were then asked whom they perceived as a task-oriented leader (identified as individuals who provide “leadership when it comes to organ- ization and planning”) and relationship-oriented leader (identified as individuals who provide “leadership when it comes to making sure the group worked together as a team”). For each leadership type, respondents recorded their answer by placing a check by the names of each person they saw as a leader on a list containing all participants’ names. Respondents were free to nominate as many leaders as they deemed appro- priate. Respondents were given the possibility (but not instructed) to nominate the same leader as both a task and a relationship leader. Respond- ents were not explicitly given the possibility to nominate themselves as leaders. Answers were then coded in a binary matrix, where each cell Xij was coded as 1 if i reported j as a leader, 0 otherwise.

As leadership emergence is a dynamic phe- nomenon, we collected leadership networks at three points in time, 1 month apart. The same pro- cedure was used for each round of data collec- tion. By the end of our observation period, which coincides with the end of the study abroad program, we collected three adjacency matrices for each leadership style (task- and relationship- oriented leadership). That is, our dependent vari- ables are two changing leadership networks (one for task-based and the other for relationship- based) which capture how the overall pattern of

Emery et al. 35

leadership nominations change over time. By modeling the evolution of these two networks, we aim to understand how, and to which extent, attributes (personality) of the individual actors affect the dynamics of networks.

Individual Covariates (Independent Variables) The Big Five were measured using the Big Five Inventory (BFI; John & Srivastava, 1999). The scale contains 44 self-descriptive items anchored at 1 (strongly disagree) and 5 (strongly agree). Summary scores were computed for each of the Big Five factors: extraversion, agreeableness, conscien- tiousness, neuroticism, and openness. As previous research consistently revealed that leadership emergence is positively related to cognitive intelli- gence (e.g., Taggar et al., 1999), we assessed par- ticipants’ cognitive abilities. We used grade point average (GPA) as a proxy for cognitive abilities (Ridgell & Lounsbury, 2004).

Advice and Friendship Networks (Controls) The theory of relational leadership argues that leadership emerges from other social relation- ships among group members (Uhl-Bien, 2006). Fernandez (1991) as well as Mehra, Marineau, Lopes, and Kass (2009) have shown that leader- ship networks are influenced by friendship net- works; specifically, people are more likely to nominate friends as leaders. To control for the influence of other types of social relationships on the evolution of leadership networks, we collected advice and friendship network data. As for the leadership networks, the advice net- work was assessed at three points in time, 1 month apart. Participants were asked “Whom did you ask for class advice this past month?” and, as for the leadership networks, recorded their answers by placing a check by the names of each person they went to for advice. Since only a few of the participants were friends before joining the program, the friendship net- work was collected at one point in time only, on the first day of the study abroad program. Par- ticipants were asked whom they considered as friends.

Modelling Approach The longitudinal leadership networks we collected cannot be analyzed using standard statistical pro- cedures (e.g., regression) due to the high interde- pendence of network observations over time (Snijders et al., 2010). We therefore rely on a new class of models designed for social network panel data: stochastic actor-oriented models (SAOM) which are run using the program SIENA (Snijders, 2009; Snijders et al., 2010). For technical descrip- tions, we refer our reader to the work by Snijders et al. (2010). Simply stated, SAOM treat a dynamic network as a dependent variable (e.g., in this inves- tigation, a longitudinal leadership network) and aim at investigating the many different tendencies driving its evolution. SAOM assume that changes in the network represent choices made by the actors in the network. In the context of this study, SAOM allow us to investigate the effect of the personality of actors on sending and receiving leadership nominations over time.

SAOM simultaneously differentiate among “actor covariate effects” that are based on the characteristics or attributes of individual actors, “dyadic covariate effects” that are based on the characteristics of pairs of nodes, and “network effects” derived from the network structure (Snijders et al., 2010). In our analysis, network and dyadic effects are included as controls, while actor covariate effects model how the Big Five affect the evolution of the leadership network over the duration of the study abroad program.

Actor covariate effects test whether properties of actors explain the formation of leadership ties over time. Three types of effects can be modeled: sender, receiver, and similarity effects. Sender effects test if actors scoring higher on a particular covariate (e.g., openness) are more likely to send a greater number of ties over time (e.g., to nomi- nate another individual as a leader). Sender effects will be used to test our hypotheses regarding emergent followership. Receiver effects capture the tendency for actors scoring higher on a par- ticular covariate (e.g., conscientiousness or extra- version) to receive greater number of ties over time (e.g., to emerge as leaders). Receiver effects

36 Group Processes & Intergroup Relations 16(1)

will be used to test our hypotheses regarding emergent leadership. Finally, similarity effects associated with a covariate capture the tendency for individuals to send ties to others who are sim- ilar to themselves.

Dyadic covariates express the extent to which a tie between two actors is more likely when another social tie links both actors (Snijders et al., 2010). Simply stated, these effects allow us to control if a relationship (e.g., leadership) depends on the presence of another relationship (e.g., advice or friendship).

Network effects capture tendencies for the net- work to evolve around particular structures, or a pattern of ties. The literature suggests three net- work effects to be included, as controls, in our analysis: reciprocity, transitivity, and centrality. As lead- ership is expected to be an asymmetric and hierar- chical relationship (Fernandez, 1991), ties within a leadership network are not likely to be reciprocated (Mehra et al., 2009): if Jay perceives Kyle as a leader, then Kyle is unlikely to perceive Jay as a leader. Transitivity, often seen as a measure for net- work closure “friends of my friends are my friends,” can fulfill competitive motives in social relationships (Offstein, Madhavan, & Gnyawali 2006). Transitivity in leadership relationships guides individuals into constructing a local hierar- chy: if Mark perceives William as leader who per- ceives Joe as a leader, then Mark is more likely to perceive Joe as a leader. Finally, evidence on emer- gent leadership suggests a tendency toward high skewness in leadership choices (Mehra et al., 2006). It suggests that leadership networks will tend to become more centralized around “popular” actors. Specifically, emergent leaders will reinforce their social position and become nominated as leaders by a greater number of group members over time.

Results Table 1 reports the descriptive statistics (means, standard deviations, and when applicable, reliabil- ity measures) as well as correlations on both the individual covariates and the dependent measures at each point in time. Descriptive network statistics

suggest that the average number of relationship- oriented leaders decreases over time while the average number of task-oriented leadership nom- inations remains constant. Correlations over time between the number of ties sent and received for both types of leadership suggest that these are distinct constructs. Initially, group members largely nominated the same people as both task- and relationship-oriented leaders (r = .82, p < .01, at Time 1), however, this tendency decreased over time (r = .61, p < .01, at Time 2). Indeed, by Time 3 group members ended up nominating different people as task- and relationship-based leaders (r = −.17, ns).

For each type of leadership network, a set of SAOMs were built using a forward approach. Model 1 contains all control variables (network and dyadic covariates) as well as sender effects for all individual covariates. Model 2 adds receiver effects for all individual covariates. Finally, Model 3 adds similarity effects. Table 2 summarizes the models developed for assessing the evolution of the relationship-oriented leadership network while Table 3 shows the results for the task- oriented leadership network. We report each parameter’s coefficient and significance. If a parameter equals zero, the corresponding effect plays no role in network evolution. If it is positive, it implies that “there will be a higher probability of moving in directions where the corresponding effect is higher, and the converse if the parameter is negative” (Snijders et al., 2010, p. 47). Using the forward approach, when describing our results, we report parameters from Model 3 only. Since Model 3 contains all controls and all effects of interest (sender, receiver, and similarity effects), it provides the most complex and integrative view of how the different effects impact the dynamics of the leadership networks.

Emergent Leaders To test if emergent leaders tended to be higher on specific personality traits, we must look at receiver effects for each Big Five trait. Our models revealed that group members higher

Emery et al. 37

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38 Group Processes & Intergroup Relations 16(1)

on extraversion were more likely to receive task- and relationship-oriented leadership nominations over time (Table 2, βextravert = .019, p < .01; Table 3, βextravert = .020, p < .01). Our analysis also sug- gests that individuals who scored highly on open- ness were less likely to receive both types of leadership nominations (Table 2, βopen = −.022, p < .05; Table 3, βopen = −.025, p < .01). Neuroticism had no significant effect on both types of leader- ship emergence. Taken together, these results

provide only partial support for Hypothesis 1a. Group members higher on conscientiousness were more likely to receive more task-oriented leadership nominations over time (Table 3, βconscientious = .033, p < .01), which supports Hypothesis 1b. Interestingly, we found that con- scientiousness also facilitated the emergence of relationship-based leaders (Table 2, βconscientious = .025, p < .05 ). Finally, we found a marginally sig- nificant effect for Hypothesis 1c: group members

Table 2. Evolution of Relationship Leadership Network

Model 1 Model 2 Model 3

Network effects (controls) Out–degree –1.819 ** –1.762 ** –1.896 ** Reciprocity .168 .276 .260 Transitivity .258 ** .285 ** .294 ** Popularity .046 ** .178 * .157 * Dyadic covariates (controls) Advice class .230 .202 .180 Friends Time 0 .081 .061 .093 Individual covariates Sender effects: Who nominates others as a leader? GPA –.110 –.107 –.114 Agreeable –.035 ** –.034 * –.026 ** Conscientious .010 .009 .007 Extravert –.012 –.013 –.013 Open .023 * .023 ** .023 * Neurotic –.025 * –.025 * –.022 * Individual covariates Receiver effects: Who is being nominated as a leader? GPA –.003 –.008 Agreeable .024 † .025 † Conscientious .021 * .025 * Extravert .022 ** .019 ** Open –.018 * –.022 * Neurotic .017 .017 Individual covariates Similarity effects: Tendency to send ties to similar others GPA –.272 Agreeable –.561 * Conscientious .093 Extravert –.313 Open .496 * Neurotic .267

Note. Models were rerun adding sender, receiver, and similarity effects on “gender” and “age.” As none of the coefficients were significant, we concluded that, in this group, gender did not affect leadership emergence. Interpretation: A positive coeffi- cient indicates the tendency for the network to evolve “in direction where the corresponding effect is higher, and the converse if the coefficient is negative” (Snijders et al., 2010, p. 47). **p < .01; *p < .05; †p < .10.

Emery et al. 39

higher on agreeableness received more relation- ship-based leadership nominations over time (Table 2, βagreeable =.025, p<.10).

Emergent Followers Sender effects shown in Tables 2 and 3 suggest that followers’ personalities impact their propensity to send leadership nominations. In general, our mod- els suggest the emergence of relationship-oriented

leadership was significantly more affected by fol- lowers’ personality than the emergence of task- oriented leadership. Results from Table 2 suggest that individuals who were more agreeable (βagreeable = −.026, p < .01) and neurotic (βneurotic = −.022, p < .05) sent less relationship-based leadership nominations; whereas individuals who were more open (βopen = .023, p < .05) were more likely to nominate others as relationship-oriented leaders. In contrast, individuals who were more conscientious

Table 3. Evolution of Task Leadership Network

Model 1 Model 2 Model 3

Network effects (controls) Outdegree –1.895 ** –1.891 ** –1.895 ** Reciprocity .187 .201 .216 Transitivity .136 ** .135 ** .131 ** Popularity .072 ** .063 ** .068 ** Dyadic covariates (controls) Advice Class .333 ** .255 * .238 * Friends Time 0 .062 .095 .154 Individual covariates Sender effects: Who nominates others as a leader? GPA –.065 –.059 –.045 * Agreeable –.021 * –.020 –.014 Conscientious .028 ** .021 * .028 * Extravert –.002 .000 –.002 Open .002 –.002 –.004 Neurotic –.008 –.010 –.010 Individual covariates Receiver effects: Who is being nominated as a leader? GPA .165 * .154 * Agreeable –.003 –.002 Conscientious .034 ** .033 ** Extravert .020 ** .020 ** Open –.021 * –.025 ** Neurotic –.001 –.003 Individual covariates Similarity effects: Tendency to send ties to similar others GPA –.258 Agreeable –.583 * Conscientious .228 Extravert –.167 Open .315 Neurotic .229

40 Group Processes & Intergroup Relations 16(1)

were more likely to nominate task-based leaders (Table 3, βconscientious = .028, p < .05). Thus Hypotheses 2c and 2d on conscientiousness and openness were supported, and Hypotheses 2a and 2e on agreeableness and neuroticism were partially supported for relationship- (but not task-oriented) leadership. Given that extraversion showed no sig- nificant changes in ties sent over time, Hypothesis 2b was not supported.

Leader–Follower (Dis)Similarities Results in Table 3 suggest that followers tend to nominate as relationship-oriented leaders individ- uals similar to themselves only on openness to experience (βopen = . 496, p < .05). In terms of leader–follower differences, results in Tables 2 and 3 demonstrate that leaders (both task- and relationship-oriented leaders) and associated fol- lowers tend to be dissimilar on agreeableness (Table 2, βagreeable = −.561, p < .05; Table 3, βagreeable = −.583, p < .05). That is, a leadership tie was more likely to appear if a leader and follower were different on agreeableness.

Discussion Overall, our results generally supported our hypotheses. In terms of emergent leadership, indi- viduals who were more extraverted, open to expe- rience, and conscientious received more task- and relationship-oriented leader nominations as the network developed over time. In contrast, more agreeable individuals were marginally more likely to be nominated as relationship-oriented (but not task-oriented) leaders. With respect to emergent followership, group members who were more agreeable and neurotic were less likely to nomi- nate relationship-based leaders, whereas those more open to experience were more likely to nominate relationship-oriented leaders. In addi- tion, highly conscientious group members were more likely to nominate task-oriented leaders. Both task- and relationship-oriented leader nomi- nations were based on dissimilar levels of agreea- bleness between leaders and followers, whereas nominated relationship-based leaders tended to

have similar levels of openness to experience to followers.

Our findings clearly link the Big Five personal- ity traits to the emergence of task- and relation- ship-based leadership. Importantly, by identifying the personality profiles of group members who received more leadership nominations, we were able to refine our understanding of the role that personality plays in people’s prototypes or implicit leadership theories (ILTs) of task- and relation- ship-based leaders (Shondrick & Lord, 2010). Extraversion, openness to experience, and con- scientiousness were positively related to receiving both task- and relationship-oriented leadership nominations. Although there was less differentia- tion between task and relationship leader func- tions than expected, there was some evidence that agreeableness is more important for relation- ship- than task-oriented leadership. Contrary to expectations, neuroticism played no significant role in leadership emergence. These results only partially replicate earlier meta-analytic findings (e.g., DeRue et al., 2011; Judge et al., 2002). The differences between our findings and previous research may be partly attributable to the differ- ent kinds of leadership measured (i.e., formal vs. emergent leaders) or the different kinds of research designs used. Our longitudinal social network design allowed for the emergence of multiple (i.e., shared) leadership across time. Although previous research that has used cross- sectional perceptions of individual formal leaders has sometimes demonstrated the importance of agreeableness and neuroticism, our results appear to find these two traits less relevant to perceiving leaders dynamically, when emergent network nominations are used as measures of leadership. In contrast, our results show that extraversion, openness to experience, and conscientiousness all seem to be salient for both kinds of leadership functions (task and relationship). It is possible that these traits signify equally valued, influential group coordination skills in emergent leadership, therefore blurring the task–relationship leader- ship distinction. However, given that our results showed that it took 3 months for group members to clearly differentiate between task- and

Emery et al. 41

relationship-based leaders, it is possible that the differential impact of personality traits on task— versus relationship-based leadership—is likely to be stronger over longer periods of time. Although plausible, this idea awaits further research. Future research should also aim to investigate whether personality traits are valued differentially in terms of various leadership behaviors emerging as appropriate for different situations, as argued by trait activation theory (e.g., De Hoogh, Den Hartog, & Koopman, 2005).

Secondly, our findings link the Big Five to emergent followership. Overall, these findings have implications for identifying the specific cog- nitive content of the IFTs of leadership categori- zation theory. More specifically, our results shed light on which personality traits define followers most willing to send leadership ties and recipro- cate leadership with followership (Shondrick & Lord, 2010). As predicted, agreeableness and neuroticism were associated with reduced follow- ership of relationship-oriented leaders over time. This is somewhat consistent with previous research linking agreeableness to passivity, laxity, and carelessly missed deadlines (Bettenhausen & Murnighan, 1991; Hetland et al., 2008), and research linking neuroticism to worrying about conflict and unpleasant relationships, erratic affective reactions, and reduced perceptions of transformational leadership (Bolger & Schilling, 1991; Felfe & Schyns, 2006; Spangler et al., 2004). Future research should seek to further investigate the mechanisms underlying this phenomenon; in any case, it appears that neurotic and agreeable individuals are unreliable followers in relationship contexts, perhaps because they see this type of leader–follower interaction as stressful, unneces- sary, or do not recognize it as leadership per se.

As expected, those higher on openness to experience were more likely to report following relationship-oriented leaders. Consistent with past research, followers who were open to experi- ence were more likely to endorse leaders that were participatory in style and who focused on developing and empowering followers rather than the more formal structure and direction of the task (Aluja et al., 2003; Stevens & Ash, 2001).

Unexpectedly, extraversion did not play a role in the followership of either type of leader. In the current study it may have been that extraverted group members were too engaged with being leaders themselves, seeking attraction and status rather than bestowing leadership on others, and our network approach brought that tendency to the forefront by inviting explicit leadership nomi- nations (Campbell, Simpson, Stewart, & Manning, 2003). Given that virtually all previous research has made the more obvious connection between extraversion and leadership, future research may do well to investigate to what extent extraverts can follow at all, and under what conditions.

Group members higher on conscientiousness, as expected, were more likely to nominate and fol- low task-oriented leaders as the leadership networks emerged. In line with past research, conscientious followers are indeed geared to rec- ognize and endorse task-related behaviors in lead- ers (Ehrhart & Klein, 2001; Roberts et al., 2005), most likely because of their relative prioritization of group functions such as task execution and goal management (Gevers & Peeters, 2009; Sy, 2010).

Finally, we found partial support for the importance of leader–follower (dis)similarity. Both types of nominated leaders tended to be dissimilar in agreeableness from their corre- sponding followers. This complementarity effect is supported by the general theoretical stance held by optimal distinctiveness theory (Brewer, 1991), self-verification theory (Riley & Burke, 1995; Swann & Read, 1981), and leader–follower negotiation of distinctive roles (DeRue & Ashford, 2010), where mutually accepting differences helps to support both the individual and the group. In contrast, relationship-oriented leaders and their followers tended to be similar in openness to experience, supporting theories of similarity attraction and a shared social identity within a group (Ehrhart & Klein, 2001; Hogg, 2001). Indeed, a baseline similarity in openness to expe- rience may help a group to harness a diversity of emergent leaders and followers effectively (e.g., Homan et al., 2008). In our study, the relatively high size of the single group network may have made it hard for group members to finely

42 Group Processes & Intergroup Relations 16(1)

distinguish personality diversity across many mem- bers. Future research should investigate how, when, and why personalities and emergent leader– follower roles fit together in groups based on similarities versus complementarities (e.g., Kristof- Brown, Barrick, & Stevens, 2005).

Limitations and Future Research Despite gathering rich longitudinal network data, our study has several limitations. First, we focused on levels of actual similarity between the inde- pendent self-reports of group members’ person- alities rather than (within-person) perceptions of perceived similarity. Although, perceived similar- ity is clearly important and often has strong effects on follower preferences for leadership there are good reasons for examining actual simi- larity. For example, our focus on actual similarity circumvented the methodological problems asso- ciated with single-source bias. Moreover, actual similarity tends to drive the effects of perceived similarity (e.g., Curry & Kenny, 1974), so it ena- bled us to concentrate on a more distal, and rarely examined, cause of emergent leadership. In addi- tion, the importance of actual similarity is sup- ported by the notion that group members’ interactions are sustained by having others see them consistently with how they see themselves, meaning that people’s actual standing on a trait can be as important as their perceived standing on a trait (Swann & Read, 1981).

Secondly, we relied on a relatively small student sample. It is not clear to what extent our findings generalize to other types of groups and larger populations, although where reasonable compari- sons could be made, our findings were generally consistent with previous research. Nevertheless, future research should sample different group types where leadership, followership, and leader– follower characteristics may be different and oper- ate differently (e.g., management groups, culturally diverse groups, friendship groups). Future research can also fruitfully incorporate corre- sponding tests of other individual differences, including empathy, narcissism, perspective taking, reciprocity norms, as well as other leadership

styles, and the various social constructions around leadership as a group process (DeRue & Ashford, 2010).

Finally, the social network approach adopted in this study forces participants to nominate indi- viduals within the group as leaders, which excludes the potential role of individuals outside the network (e.g., the professor, other students). Temporally, our approach looked at how the net- work emerged over a period of 3 months, in terms of ongoing nominations and ties as the network grew and established itself, but our anal- yses do not speak to precisely how immediate, stable, or long-lasting personality may influence the perceptions of leadership and followership. Our descriptive statistics, however, do provide an initial indication that individual personality traits may differentially affect leadership emergence over time. For example, while extraversion’s impact on the emergence of relationship leaders grew stronger over time, agreeableness’ initial impact diminished. In contrast, conscientious- ness and extraversion had a constant impact on the emergence of task-based leaders over the three time periods. These subtleties were not directly reported in our SAOM as we did not hypothesize specific temporal dynamics due to a lack of prior research and these models, by default, analyze the overall evolution of the net- works. However, it is hoped that future research could shed some light on these complex and interesting temporal issues.

Conclusion Although leadership emergence is defined as a process during which some individuals are recog- nized as leaders by the group, somewhat surpris- ingly, the majority of research has focused on the study of leaders, not on the process of leadership emergence. In this study, we treated leadership emergence as a complex social process involving all group members and resulting in the emer- gence of multiple potential leaders (Mehra et al., 2006). To refine our understanding of this group process, we conducted a study on how group members’ personalities influenced the emergence

Emery et al. 43

of task- and relationship-oriented leadership in the context of leaderless groups. By performing a longitudinal analysis of leadership networks using social network modeling, we conclude that emer- gent leadership is not ideally focused around a singularly exceptional individual. Instead, leader- ship is best viewed as a dynamic group process and that both leader and follower personality have an important part to play in the process of leader (and follower) emergence.

Note 1. Another study (Emery, in press) was also published

from this sample. It is important to stress, however, that the present study differs from the Emery (in press) study in three fundamental ways. First, the independent variables in the two studies are distinct. Specifically, the Emery (in press) study focused on leaders’ emotional ability, whereas the independent variables in the current study were leaders’ and fol- lowers’ Big Five personality traits. Second, the theo- retical focus of the Emery (in press) study was on emergent leadership, whereas the theoretical focus of the present investigation was on emergent lead- ership, emergent followership, and complementarity and similarity effects between leaders and followers. Hence, the current study addresses a broader and unique set of predictions compared to the Emery (in press) study. Finally, the social network analyses are different across the two studies: the SAOM modeling in the current study uses sender and simi- larity effects and includes a new dyadic covariate (an advice network). Therefore, to sum up, the theoreti- cal framework, the predictions and the analyses are entirely independent across the two studies.

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