 Psychology 2011. Vol.2, No.5, 426-432 Copyright © 2011 SciRes. DOI:10.4236/psych.2011.35066 Social Identification Dimensions as Mediators of the Effect of Prototypicality on Intergroup Behaviours Patricia L. Obst1, Katherine M. White1, Kenneth I. Mavor2, Rosland M. Baker1 1School of Psychology and Counseling, Queensland University of Technology, Brisbane, Australia; 2School of Health and Psychological Sciences, Australian National University, Canberra, Australia. Email: p.obst@qut.edu.au Received May 5th, 2011; revised June 6th, 2011; accepted July 18th, 2011. Cameron (2004) proposed a three-dimensional model and measure of social identification consisting of cogni- tive centrality, in-group affect, and in-group ties. This approach has received g rowing theoretical and empirical support; however, little research has examined how these dimensions of social identification may relate diff eren- tially to intergroup outcome behaviors. The current research sought to address this question by examining the possible mediating role the dimensions of social identification on the relationship between prototypicality of group members and the intergroup outcome behaviors of in-group favoritism, out-group derogation, and collec- tive self-esteem. The current stud y examined un iversity students’ (N = 235) feelings towards students from their own and another local university. Structural equation modeling was used to identify the most appropriate and parsimonious models of these pathways. The results showed support for the utility of measuring social identifi- cation using a multidimensional approach with unique meditational pathways emerging for the distinct inter- group behaviors . Keywords: Social Identification, Prototypicality, Intergroup Outcomes Introduction The construct of social identity has become one of increasing importance in the social psychology literature since the devel- opment of Social Identity Theory (SIT) (Tajfel, 1978; Tajfel & Turner, 1979). An improved understanding of this construct is due to the development of valid indicators, many of which are derived from the scale developed by Brown et al. (1986). While early work tended to view and measure social identity as a un- idimensional concept, treating identification as a general at- tachment to an in-group, there is growing evidence within the field to suggest that this approach is inadequate (see Ashmore, Deaux, & McLaughlin-Volpe, 2004). Indeed, Tajfel’s (1978) original definition of the construct of social identity, referring to an individual’s knowledge of belonging to a social group, together with the emotional and value significance of that group membership, reflects multidimensionality. Knowledge of be- longing to a particular group points towards a cognitive aware- ness, while the emotional significance indicates an affective dimension, and the value significance points towards an evalua- tive aspect. Deaux (1996) argues that cognitive processes, emotional as- sociations, and interdependence between group members are all important aspects of social identity. Karasawa (1991) distin- guished between identity with the group and identity with group members. Smith, Murphy, and Coats (1999) argue that group attachment is distinct from other forms of group identify- cation. Ashmore et al. (2004) proposed an organizational framework of collective identity incorporating work from sev- eral theoretical perspectives—Social Identity Theory (Tajfel & 1978, Self Categorization Theory (Turner et al., 1987), and Identity Theory (Stryker, 1987.) This framework suggests that collective identity is multifaceted and includes seven broad dimensions: self-categorization, evaluation, importance, at- tachment and interdependence, social embeddedness, behave- ioral involvement, and content and meaning. Each dimension then has several elements that, in turn, underlie the dimension. This framework suggests further that t he varied aspects of iden- tification may be related differentially to a number of inter- group outcomes. Within social identity literature, a number of researchers have found empirical evidence for a multidimensional concept- tualization of social identity (e.g., Cameron & Lalonde, 2001; Ellemers, Kortekaas & Ouwerkerk, 1999; Hinkle et al., 1989; Jackson, 2002). Hinkle et al. (1989) found evidence for a mul- tidimensional view of social identity composed of an affective aspect, a cognitive aspect, and a group dynamics aspect. Elle- mers et al. (1999) reported findings supportive of three factors of social identity: group self-esteem, self-categorization, and commitment to the group. Jackson (2002) also presented evi- dence that supported three factors underlying the construct of social i dentity: self-categorization, evaluation of the group, and perceptions of solidarity. While the factor structure of social identity does vary across these studies, the concept of the mul- tidimensionality of social identity has received strong empirical support. Recently, Leach et al. (2008) have presented a hierarchical model of in-group identity which conceptualise subcomponents that fit within two broad dimensions. Leach et al. distinguish between group-level se lf-definition (i.e., individual self-stereo- typing, in-group self-stereotyping) and self-investme nt (solidar- ity, positive evaluation, and centrality). These authors suggest that individuals may identify in different ways with distinct groups. For example, the authors distinguish between the way artificially created groups and real world groups identify with their in-group. They suggest that, as artificially created groups
 P. L. OBST ET AL. have little prior history or interaction or shared members, in-group identification is likely to be based in group-level self- definition. Real world groups, on the other hand, with longer histories and interaction, would be more likely to identify in terms of self investment such as positive evaluation, solidarity, and centrality. Cameron (2004) developed a model and valid measure of so- cial identity based on studies of in-group identification of real world groups that capture the elements of Leach et al.’s (2008) self investment category of social identification. Cameron’s model describes social identity as having the three dimensions: cognitive centrality, in-group affect, and in-group ties. Cogni- tive Centrality is the amount of time spent thinking about being a group member or the cognitive salience of a given group membership, which is similar to the self categorization dimen- sions which emerged in Ellemers et al.’s (1999) and Jackson’s (2002) findings and the centrality dimension of Leach and col- leagues. In-group Affect, the positivity of feelings associated with membership in the group, encapsulates the affective di- mension that has emerged in many studies (e.g., Ellemers et al., 1999; Hinkle et al., 1989; Jackson, 2002) and is similar to the positive evaluation component proposed by Leach and col- leagues. In-group Ties is the perception of similarity and bonds with other group members and is also in line with much previ- ous research (e.g., Ellemers et al., 1999; Hinkle et al., 1989; Jackson, 2002; Karasawa, 1991) and comparable to the solidar- ity component proposed by Leach and colleagues. Over the course of several studies, Cameron (2004) devel- oped a 12-item scale measuring these three factors. Evidence for Cameron’s conceptualization of social identity has been found across several studies examining social identity with geographical and internet communities (Obst, Smith, & Zin- kiewicz, 2002; Obst, Zinkiewicz & Smith, 2002), and gen- der and race (Boatswain & Lalonde, 2000; Cameron & Lalonde, 2001). Cameron (2004) tested a unidimensional model of social identity, a two dimensional model (cognitive and emotional aspects), and a three-factor model (cognitive centrality, in-group ties, and in-group affect) and found that the data were best explained by the three-factor model. In an additional test of a three-dimensional model of social identity, Obst and White (2005) assessed participants’ social identity across three distinct group memberships. Confirmatory factor analysis of these data supported the three-factor model of social identity in comparison to fit indices for one- and two-factor models. In addition, this study found that different patterns of means and correlations emerged across groups on the three dimensions, supporting the utility of this multidimen- sional model of social identity. More recent investigations of the Cameron (2004) model have found support for the model in various contexts, including community (Bilewicz & Wójcik, 2010; Harr is, Cameron & Lang , 2011), organization (Harris & Cameron, 2005), and collective action (Giguére & Lalonde, 2010). However, while these studies have focused on identification within intragroup contexts, the present investigation focused on examining the influence of the distinct dimensions of social identification in an intergroup context. The Leach et al. (2008) studies presented some strong evidence for the discriminant validity of the dimensions of social identification. The present study will provide a useful addition to such research, as well as providing an insight into potential underlying processes by focusing on distinct in- -tergroup processes (e.g., collective self-esteem, in-group fa- vouritism, and out-group derogation). Collective Self-Esteem Consistent with several theoretical perspectives on the self-concept (e.g., Maslow, 1968), SIT posits that individuals are motivated to achieve and maintain a high level of self-es- teem. However, whereas other perspectives focus on maintain- ing a positive personal identity (i.e., personal self-esteem), SIT is primarily concerned with the motivation to maintain a posi- tive social identity (i.e., collective self-esteem; Crocker & Lu- htanen, 1990). While personal self-esteem is characterized by self-perceptions of attractiveness and likeability, collective self-esteem is characterized by the positive or negative beliefs that group members hold in relation to their social identity (Hogg & Williams, 2000; Tajfel, 1978) and, hence, is likely to be associated closely with in-group affect. Cameron’s (1999, 2004) studies indicated that collective self-esteem was posi- tively and moderately correlated with in-group affect and in-group ties, but not with cognitive centrality. Intergroup Bias In order to achieve and maintain positive collective self-es- teem, SIT predicts that group members will engage in inter- group bias behaviors as a means of positively differentiating the in-group from the out-group (Schmitt & Branscombe, 2001). These behaviors often take the forms of in-group favoritism and out-group derogation (Brown, 2000; Lindeman, 1997). The effect of intergroup bias has been demonstrated consistently in em- pirical research even in circumstances where there are few or no obvious extrinsic causes. For example, some evidence comes from studies using the minimal group paradigm in which individuals are divided into groups on the basis of trivial or arbitrary distinctions (Tajfel, Billig, Bundy & Flament, 1971), explicitly excluded from evaluations, and do not benefit from the rewards. In these studies, participants still allocate more rewards to members of the in-group than to the out-group (e.g., Brewer, 1979; Diehl, 1990; Corenblum & Stephen, 2001; Jetten, Spears & Manstead, 1997), evaluate out-group members less favourably than in-group members (e.g., Schmitt & Brans- combe), and regard products of the in-group to be superior to those of the out-group (As hforth & Mael, 1989; Wann & Grie ve, 2005). Leach et al. (2008) argue that, as centrality encapsu- lates notions of salience and importance, the relationship be- tween centrality and inter-group-outcomes is likely to be stronger. Several studies have also shown that higher cognitive centrality is associated with stronger intergroup discrimination (Cameron, 1999, 2004; Cameron & Lalonde, 2001). Prototypicality Further to these findings in minimal group paradigms, stud- ies have shown that intergroup bias behaviors are strongest among prototypical group members (e.g., Branscombe & Wann, 1994; Vivian, Brown & Hewstone, 1995; Verkuyten & Nekuee, 1999). Comparisons between the in-group and out-group lead to the representation of groups in terms of prototypes (Jetten et al., 1997). These prototypes refer to a contextually-appropriate set of descriptive and prescriptive cognitive representations of group-specific ways to think, feel, and behave which, in turn,
 P. L. OBST ET AL. allows for group members to evaluate themselves according to the same sta ndards u sed to evalua te other gr oup member s (Hogg, Abrams, Otten, & Hinkle, 2004). Prototypical group members are defined as being similar to the in-group prototype and dis- similar from the out-group prototype (Hogg et al., 2004). Re- searchers have shown consistently that prototypical group mem- bers are typically evaluated more positively by themselves and other in-group members (Castano, Paladino, Coull, & Yz- erbyt, 2002); are higher in collective self-esteem (Jetten et al., 1997); and are more likely to engage in out group derogation as a way of increasing collective self-esteem (Brans combe & Wann, 1994). The Current Study Several studies support the notion of different relationships between dimensions of social identification and intergroup outcomes (e.g. Ellemers et al., 1999, Leach et al., 2008), how- ever, there is still a limited understanding of which specific aspects of identification predict which specific collective per- ceptions and behaviors. The current study aims to expand on previous research by examining in greater detail the influence of the proposed dimensions of social identity or what Leach and colleagues (2008) would classify as self investment identity dimensions on intergroup outcomes behaviors of in-group fa- voritism, out-group derogation, and collective self-esteem. Data were collected via a cross-sectional study of psychology stu- dents from a large Australian university; the study assessed students’ attitudes towards both students from their own and another local university. Based on previous research (e.g., Jet- ten et al., 1997), it was hypothesized that students’ perceived prototypicality as a student of their specific university would be related positively to their social identification and levels of in-group favoritism, out group derogation, and collective self- esteem. It was hypothesized further that the effect of prototypi- cality on in-group favoritism, out-group derogation, and collec- tive self-esteem would be differentially mediated by the dimen- sions of social identification (centrality, in-group affect and in- group ties). Cameron (2004) and Cameron and Lalonde (2001) indicated that the cognitive dimension of social identifycation is linked with stronger intergroup discrimination and in-group af- fect with collective self-esteem. It was hypothesized that in- group affect would be the strongest mediator of the prototypi- cality and collective self-esteem relatio nshi p, and ce ntrality woul d be the strongest mediator of the relationship between proto- typicality and bot h in-group favoritism and out -group derogation. Method Parti c ipants Two hundred and thirty-five undergraduate Queensland Uni- versity of Technology students (48 males and 187 females) par- ticipated in the study for course credit. The mean age of partici- pants was 23. 48 years (SD = 7.65), w ith a range of 17 to 52 years. Procedures and Measures The design and several measures were based on Jetten and colleagues (put in reference here to be correct re APA1997). Students were approached in class and invited to participate in a study about how their beliefs in supernatural phenomena com- pared with those of students from another local university (of approximately comparable status). Piloting of the survey indi- cated that the topic of supernatural phenomenon was not linked to the status of the groups or seen as of central importance to students. The survey contained a small questionnaire of beliefs in supernatural phenomenon and the following measures. In-group favouritism. Participants were told that the experi- menters were interested to know how they, as students, felt about the allocation of resources for universities. Participants were asked to distribute—as they saw fit—a number of grants, scholarships, and delegations to a university student conference between (their in-group) QUT students and (an out-group) Griffith University students. The combined percentages of these allocations to QUT students formed the indicator of in-group favoritism out of a possible 100% allocation of all resources to QUT students. This measure was internally reliable (α = .87). Out-group derogation. Participants were then asked to com- plete a 12-item questionnaire regarding their feelings towards (out-group) Griffith University students, which consisted of adapted items such as ‘I admire Griffith students’ and ‘I feel superior to Griffith students’. This measure was designed by Stephen and Stephen (1993), and has been used in previous studies to reflect any negative affect relating to out-groups (e.g., Corenblum & Stephen, 2001). The scale includes the following evaluative and emotional terms: hostility, admiration, disliking, acceptance, superiority, affection, disdain, approval, hatred, sympathy, rejection, and warmth. All items were responded to on a Likert scale ranging from 1 (strongly disagree) to 7 (strongly agree) and the 12 item scores were added to give a total score with higher scores indicating greater out-group de- rogation. This measure was reliable (α = .81). Collective self-esteem. Collective self-esteem in relation to one’s in-group was measured using three items: ‘At the mo- ment I am pleased to be a student at QUT’; ‘At the moment I have a good feeling about being a student at QUT’; and ‘At the moment I am satisfied about the fact that I am a student at QUT’ (Doosje, Ellemers, & Spears, 1995; Jetten et al., 1997). Responses were indicated on a Likert scale ranging from 1 (strongly disagree) to 7 (strongly agree). Scores on the three items were summed to give an aggregate collective self-esteem score. This measure was reliable (α = .95). Social identification. Participants were asked to complete the 12 items from Cameron’s (2004) “Three Dimensional Strength of Group Identification Scale”. Four items assessed each aspect of the three-dimensional model of social identification in rela- tion to one’s in-group: cognitive centrality (e.g., ‘I often think about being a QUT student’; α = .80); in-group affect (e.g., ‘In general I’m glad to be a QUT student’; α = .80); and in-group ties (e.g., ‘I feel strong ties to other QUT students’; α = .83). Responses were indicated on a Likert scale ranging from 1 (strongly disagree) to 7 (strongly agree). Prototypicality. Based on the item used by Jetten et al. (1997) to assess self-perceptions of in-group prototypicality, partici- pants were asked to respond to the statement: ‘Overall, I per- ceive myself as being a typical QUT student’ on a Likert scale ranging from 1 (strongly agree) to 7 (strongly disagree). Results Preliminary Analyses Preliminary analyses revealed no significant missing data or
 P. L. OBST ET AL. breaches of normality. Total scales were calculated based on responses for a minimum of 75% of completed items per scale. The correlations between prototypicality, the dimensions of social identification, and the intergroup outcome behaviors are shown in Table 1. Main Analyses The meditational models were tested via AMOS. For each outcome variable of in-group favoritism, out-group derogation, and collective self-esteem, the initial model included proto- typicality and the potential mediators: cognitive centrality, in-group affect, and in-group ties. The model included corre- lated error-terms for the social identity scales to capture the common variance not associated with prototypicality. High correlations between the three social identity subscales could potent ially cause some i nstability in models containing all three mediators; however, in this case, the zero-order correlations among the social identity scales are small to moderate (see Table 1) and, thus, potentially can act as somewhat independent mediators. The final models presented are those that produced the most parsimonious and best fitting models after removing non-significant pathways. The pathways weightings presented in the models are standardized for comparability. Figures 1(a) 2(a), and 3(a) show the initial pathways for each outcome vari- able, and Figures 1(b), 2(b), and 3(b) show the final best fit ting model for each outcome variable. Table 2 presents model fit for the initial and final models for each outcome variable. Discussion The aim of the current study was to investigate whether the dimensions underlying social identification would differentially mediate the relationship between prototypicality and the inter- group outcome behaviours of in-group favoritism, out-group derogation, and collective self-esteem. As demonstrated in previous studies, the results of the current study supported the hypothesis that prototypicality was positively related to the dimensions of social identification and to the outcome behave- iours of in-group favoritism, out-group derogation, and collec- tive self-esteem. Furthermore, the results supported the hy- pothesis that the dimensions underlying social identification differentially mediate the relationship between prototypicality and these intergroup outcome behaviours. Specifically, highly prototypical students who reported high levels of centrality engaged in more in-group favoritism and out-group derogations. This finding is consistent with previous research in this area in which a cognitive dimension has been shown to repeatedly appear in measures of social identification (e.g., Cameron, 2004; Cameron & Lal onde, 2001; Jackson, 200 2) and has been linked with stronger intergroup discrimination (Cameron, 1999, 2004; Cameron & Lalonde, 2001). Further, an interesting finding emerged in terms of out-group derogation. Consistent with previous research, the regression pathways revealed tha t the cognitive dimension of centrality was positively re la t ed to out -group de rogation indicating, as expected, Table 1. Correlations (r) between prototypicality, the dimensions of social identification, and the intergroup outcome behaviours. α M (SD) 1 2 3 4 5 6 Prototypicality 3.91 (1.25) 1 Centrality .80 4.12 (1.32) .15* 1 In-group Affect .80 3.27 (.98) .25** .40** 1 In-group Ties .83 3.52 (1.21) .39** .18** .37** 1 In-group Favouritism .87 58.42 (16.39) .14* .19** .05 .07 1 Out-group Derogation .81 3.03 (.832) .02 .17** -.19** .06 .24** 1 Collective Self Esteem .95 5.09 (1.03) .28** .36** .76*** .41** .05 .10 Note. * p < .05, ** p < .01, *** p < .01; scales are 1-7, IF is a percentage. Table 2. Model Fit statistics for the initia l and final model for collective self-esteem, in-group favouritism and out-group derogation. Model χ2 CFI RMSEA AIC Collective Self-Esteem Initial Model χ2 (1) = 2.2 .995 .080 30.24 Final Model χ2 (1) = 2.4 .996 .073 20.47 In-group Favoritism Initial Model Χ2 (1) = 02 .999 .098 40.00 Final Model Χ2 (1) = .23 .999 .010 16.23 Out-group Derogation Initial Model Χ2 (1) = 47 .997 .091 38.47 Final Model Χ2 (1) = 2.80 .997 .001 28.80
 P. L. OBST ET AL. (a) (b) Figure 1. In-group favoritism. (a) Initial model; (b) Final model. (a) (b) Figure 2. Out-group derogation. (a) Initial model; (b) Final model. that the greater a person’s awareness of their group membership, the greater the likelihood of their displaying out-group hostility. However, the pathway from the affective dimension (in-group affect) was negatively related to out-group derogation. This finding suggests different processes are operating on this di- mension. Those people who do not feel good about their own group membership are more motivated to engage in out-group hostility than those who evaluate their in-group identity posi- tively or perhaps feeling good and positive about the in-group membership means that group members do not need to engage in out-group derogation. Interestingly, while in-group affect was shown to be nega- tively correlated with out-group derogation, it was positively (a) (b) Figure 3. Collective self-esteem. (a) Initial model; (b) Final model. related to collective self-esteem, indicating, as would be ex- pected, that the better you feel about your group membership the higher your collective self-esteem. It should be noted, how- ever, that Cameron (2004) defined in-group affect in terms highly similar to Luhtanen and Crocker’s (1991) private collec- tive self-esteem subscale; hence the high intercorrrelation be- tween these scales is to be expected. Particularly in light of the fact that the present operationalization of collective self-esteem included state-specific items and, hence, represents a subjective evaluation of group membership. Centrality was not significantly related to collective self-es- teem suggesting that, while a stronger awareness of group mem- bership may promote intergroup processes such as out-group derogation and in-group favoritism, it does not necessarily promote higher collective self-esteem. Rather, it is the affective aspects of social identity that positively impact on group mem- bers’ collective self-esteem. The cognitive centrality dimension was a significant predict- tor of both in-group favoritism and out-group derogation, indi- cating that awareness and recognition of the importance of a particular social identity is an important aspect of identification in predicting inter-group outcomes. Of the many multi dimen- sional approaches to social identification, Cameron’s (2004) measure is one of the few to assess centrality through measures of salience and importance. Most other measures include cen- trality as part of a more general “cognitive” or “self-categori- zation” component that does not distinguish it from simple inclusion. Leach et al. (2008) argue that by viewing centrality in this way, the relationship between centrality and inter-group- outcomes is likely to be stronger. For example, they suggest that the centrality component of in-group identification will lead individuals to perceive greater threat to their in-group and, thus, encourage more active coping to defend this identity against threat. The results of the current study indicate a lack of
 P. L. OBST ET AL. association between centrality and the more internal process of collective self-esteem; a strong association between centrality and intergroup outcomes such as in-group favoritism and out- group derogation add credence to this argument. Given that the results of the current study show the emergence of differential relationships between the dimensions of social identification and the intergroup outcome behaviors of in-group favoritism, out-group derogation, and collective self-esteem, this study pro- vides support for the utility of examining social identification using a multidimensional model and measure. The current study contributes significantly to the literature regarding the influence of social identification on intergroup behavior through t he systematic investigation of the meditational role of the key dimensions of social identity on the relationship between prototypicality and a number of important intergroup outcome measures. Results showed clear support for the exis- tence of a differential relationship between the dimensions of social identity and different intergroup outcomes. The salience and importance of the group identity as measured by the cen- trality dimension of Cameron’s (2004) scale was related to both in-group favoritism and out-grou p derogation. Hence, awareness of group membership appears to be enough to instigate these types of intergroup processes. However, centrality did not im- pact incr e menta lly on le vel s of coll ec ti ve se lf -este e m; it wa s the more affective dimensions of in-group affect and in-group ties that were related to this more internal process. The finding that in-group affect was related negatively to in-group derogation suggests that more complex processes may be occurring. Feeling good and positive about in-group membership meant that in-group members did not feel the need to engage in out-group derogation. It should be noted that the groups in the current stu dy were chosen to be as similar to each other as possible so as to minimize an y status diff erentials. It would b e interesting to see if this finding would also emerge with out-group derogation of a higher status group. Given that this study is the first of its kind to investigate sys- tematically the differential effects of the dimensions of social identification on intergroup outcome behaviours, future re- search should examine the influence of other variables known to be important to intergroup relations – status and group size – at the dimensional level of social identification. This informa- tion would assist in providing evidence to build the theoretical understanding of how the dimensions of social identification impact on specific intergroup process and help social research- ers to better understand and reduce stereotyping and other negative group-related behaviours. 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