The Missing Side of Acculturation: How Majority-Group Members Relate to Immigrant and Minority-Group Cultures

In many countries, individuals who have represented the majority group historically are decreasing in relative size and/or perceiving that they have diminished status and power compared with those self-identifying as immigrants or members of ethnic minority groups. These developments raise several salient and timely issues, including (a) how majority-group members’ cultural orientations change as a consequence of increasing intercultural contact due to shifting demographics; (b) what individual, group, cultural, and socio-structural processes shape these changes; and (c) what the implications of majority-group members’ acculturation are. Although research across several decades has examined the acculturation of individuals self-identifying as minority-group members, much less is known about how majority-group members acculturate in increasingly diverse societies. We present an overview of the state of the art in the emerging field of majority-group acculturation, identify what is known and needs to be known, and introduce a conceptual model to guide future research.


Minority-Group Acculturation
Much psychological research on acculturation has drawn on a fourfold model of acculturation (Sam & Berry, 2016). Although this model acknowledges withingroup variability, its focus is on systematic betweengroups differences, and it has been applied mainly with respect to orientations to two cultures-minority-group and majority-group cultures. Relevant research shows that people identifying with immigrant or minoritygroup cultures regularly use four basic acculturation strategies. Individuals who follow the strategy of integration (the most preferred strategy) maintain their heritage culture while also adopting the mainstream majority culture of their society of residence. Those pursuing the strategy of assimilation give up their heritage culture in favor of the mainstream culture. People following the strategy of separation maintain their heritage culture while rejecting the mainstream culture.
Finally, those who neither maintain their heritage culture nor adopt the mainstream culture are employing the strategy of marginalization.
The much more limited acculturation research on majority groups has primarily considered majoritygroup members' resistance to changes in their culture and their expectations and preferences concerning how people who self-identify as immigrants or minoritygroup members should acculturate (Bourhis et al., 1997;Zárate et al., 2012). Research rarely considers the acculturative changes experienced by majority-group members.

Majority-Group Acculturation
Drawing on definitions applied primarily to minoritygroup acculturation (e.g., Berry, 2018;Redfield et al., 1936), we define majority-group acculturation as the cultural and psychological changes that current or former majority-group members experience and the cultural styles they adopt as a result of contact with people self-identifying as immigrants or ethnic minority-group members living in the same society. Majority-group acculturation is not simply the recognition of minoritygroup culture. Rather, it involves the genuine incorporation of aspects of minority-group culture into majority-group members' default cultural repertoire and ultimately leads to changes in the mainstream culture at the societal level.
One central way in which the concept of majoritygroup acculturation differs from how minority-group acculturation has commonly been conceptualized is that it involves cultural and psychological changes stimulated in concert by contact with members of multiple, diverse groups. That is, current or former majoritygroup members who have contact with members of different minority groups over time may adopt elements of various ethnic cultures to different degrees. Thus, majority-group acculturation focuses on the influence of multiple heritages, which are present in many contemporary, highly diverse contexts of acculturation (Doucerain, 2019;Doucerain et al., 2013).
Majority-group acculturation can occur at an individual level, as changes in personal practices, values, and identity (Schwartz et al., 2010), and/or at a societal level, for example, as changes in language or norms. At the individual level, as majority-group members repeatedly interact with minority-group members, they may engage in new cultural practices (e.g., non-Jews may celebrate Hanukkah, non-Muslims may fast together with their friends during Ramadan), prefer different food products (e.g., halal products), or explore and even convert to different religions. At the societal level, through intercultural friendships and romantic partnerships, norms for intercultural contact can change (Christ et al., 2014). In addition, majority-group members, and particularly those of younger generations, may adopt new linguistic expressions and pronunciations, which at the societal level sometimes results in entirely new dialects. Majority-group acculturation can also create changes in the way a group and its members perceive their defining characteristics. Such changes can concern the specific nature of an identity: For example, a significant percentage of residents of New Mexico identify with the Hispanos culture of the state, a historical blend of Spanish and U.S. cultures. Majoritygroup acculturation can also affect the structure of cultural identity, leading to more complex cultural identities (e.g., a more multicultural identity). Thus, through the process of majority-group acculturation, the way people identify with the mainstream culture may become more inclusive, complex, and permeable .
Current evidence suggests that majority-group acculturation differs in important ways from minority-group acculturation. People self-identifying as members of majority groups tend to adopt only two of the four strategies commonly observed among those self-identifying as immigrants or minority-group members. As Figure 1 shows, prior studies have indicated that a sizable percentage of majority-group members follow the strategy of integration, adopting elements of immigrants' and other minority groups' cultures while also maintaining their majority-group culture. However, a considerable percentage of majority-group members follow the strategy of separation, orienting themselves toward their majority-group culture while rejecting the culture of individuals self-identifying as immigrants or minority-group members. Assimilation and marginalization seem to be rarely used by majority-group members.
In further contrast to work with people self-identifying as immigrants or minority-group members, the studies summarized in Figure 1 revealed that a substantial percentage of majority-group members show no clear-cut preference for any of the four previously identified strategies. This "diffuse strategy" is, in fact, one of the most common patterns of majority-group acculturation.

Distinctive Processes in Majority-Group Members' Acculturation
There are at least two elements that critically distinguish majority-group acculturation from minority-group acculturation. First, majority-group acculturation requires changes to the traditional culture of a society and its status quo. Second, the majority group typically has more power (i.e., social, political, and economic  For each sample, the graph shows the distribution of participants across the four strategies commonly studied in immigrant and other minority groups: integration, maintaining majority-group culture while also adopting aspects of immigrant and minority-group cultures; separation, maintaining majority-group culture while rejecting immigrant and minority-group cultures; assimilation, giving up majority-group culture in favor of immigrant or minoritygroup cultures; and marginalization, rejecting both cultures. In addition, in most studies, a sizable percentage of individuals (the "diffuse" cluster) reported no clear preference for any of these four acculturation strategies. "Without personal migration history" refers to research participants who were born in the country of investigation and thus had no personal experiences of migrating to that country. "Without migration history" refers to participants who indicated that neither they nor their families had a migration history. power) than immigrants or minority-group members (Berry, 1980). People have a psychological bias to adhere to the status quo that is known and understood rather than to pursue change, which is often uncertain. Change stimulated by the increasing presence and potential influence of people self-identifying as immigrants or minority-group members is commonly perceived as a threat to the higher status of the majority group (Verkuyten, 2006) and leads its members to reinforce traditional values (Craig & Richeson, 2014). These processes have implications for both when and how majority-group members acculturate.
There are several conditions that may increase majority-group members' willingness to change their own group's culture (see Table 1). At the level of individual differences, more open-mindedness, stronger growth values (e.g., caring about the welfare of all people), and less conscientiousness are associated with greater adoption of cultures of individuals self-identifying as immigrants or minority-group members. Moreover, having more frequent intercultural contact (particularly, higher-quality contact), being more culturally sensitive, and perceiving immigration more as an enrichment than as a threat are associated with more cultural adoption. At the group and cultural level, having a stronger global identity (e.g., identifying with a common humanity) and being more ethnorelativist (i.e., showing high cultural empathy and tolerance), as well as being less ethnocentric and nationalistic, are linked to greater cultural adoption.
Many of these factors show the opposite relationship with majority-group members' maintenance of their majority culture (see Table 1). At the individual level, greater openness and having more intergroup contact are related to less cultural maintenance, and perceiving immigrants more as a threat, greater emotionality, and greater extraversion are related to more. At the group level, having less global identity and holding a stronger national identification are related to more majorityculture maintenance. Ethnocentrism was not significantly associated with maintenance of majority-group culture in previous research, which suggests that this orientation may be an attempt to conserve one's culture during a time of change rather than a reflection of a prejudiced mind.

Conceptual Model and Future Research Directions
Although the fourfold model of acculturation explains considerable variation in majority-group members' acculturation, the recurrent diffuse cluster suggests that further refinement in conceptualizing majority-group acculturation is needed. Accordingly, we present a model of majority-group acculturation in Figure 2. Grounded in processes identified in the existing literature, the model includes individual-level factors and interpersonal experiences and their relationship to adaptation to culturally diverse environments. The model also suggests concrete paths to extend the literature on this topic in a theory-based way by taking a multilevel perspective that further considers group and cultural characteristics and socio-structural influences. Our model assumes that each majority group's acculturation needs to be understood within its unique context (the specificity principle of acculturation; Bornstein, 2017) but that groups and contexts also share commonalities. Therefore, some similar processes are expected to influence and respond to majority-group members' acculturation across contexts, whereas others may be context dependent. The factors identified at each level are intended to be illustrative, not an exhaustive list.

Individual level
At the core of the model is majority-group members' individual-level acculturation, that is, (a) the degree to which they adopt the culture of people who selfidentify as immigrants or minority-group members and (b) the degree to which they maintain their majoritygroup culture (see Fig. 2). Seminal acculturation research (Schwartz et al., 2010) indicates that this process can vary by life domain.
Also at the individual level of our model are individual differences (e.g., personality traits or values, such as open-mindedness) and intergroup perceptions and attitudes (e.g., viewing diversity as a benefit rather than a threat, perceiving multiculturalism as normative in one's society; Watters et al., 2020). These factors can directly or indirectly influence majority-group acculturation. For example, by facilitating more and higherquality intergroup contact ( Jackson & Poulsen, 2005), they can lead to more adoption of another culture and less maintenance of the mainstream culture. Certain individual differences can also reduce majority-group members' likelihood of adopting other cultures: For example, prejudiced majority-group members may experience cultural exchanges as superficial and nonintimate (Boin et al., 2021), which reduces the impact of contact on acculturation.
The model also highlights reciprocal, potentially cyclical relationships at the individual level. For example, not only may positive intergroup attitudes lead to greater majority-group acculturation, but also greater acculturation may in turn lead to developing more positive perceptions and attitudes as well as adoption of values that promote more and higher-quality contact, which can ultimately promote further acculturation.
At the individual level, majority-group members' acculturation may influence their psychological adaptation (e.g., well-being), their sociocultural adaptation (e.g., competence in navigating culturally diverse contexts), and their cognitive adaptation (e.g., creativity, flexible thinking). Both adoption of minority-group culture and maintenance of the majority culture may be adaptive depending on the context. For instance, although adoption of minority perspectives may facilitate majority-group members' communication with ethnic out-group members, maintaining the majority heritage culture may offer benefits in interactions with other majority-group members. However, given new meta-analytic insights into the limited influence of acculturation on adaptation among minority groups (Bierwiaczonek & Kunst, 2021) and inconsistent findings in research on majority-group acculturation, we have represented the connection between acculturation and adaptation with a striped arrow in Figure 2. To the best of our knowledge, only one study found, in one of its samples, that adopting elements from other cultures correlated with higher life satisfaction and less acculturative stress among majority-group members (Lefringhausen & Marshall, 2016). By contrast, several studies have shown that maintaining their majority culture was positively linked to majority-group members' life satisfaction and self-esteem (Haugen & Kunst, 2017;Lefringhausen & Marshall, 2016). These latter findings are consistent with general theorizing in the acculturation and ethnic-identity literature suggesting that a stable and secure attachment to one's own group is related to more positive psychological adaptation (Phinney et al., 1997). Thus, the fact that greater perceived threat is related to more cultural maintenance (see Table 1) suggests that majority-group members may increase their engagement in their heritage culture to counter uncertainty, just as minority-group members do (Branscombe et al., 1999).
Sociocultural adaptation can involve the acquisition of new cultural schemas that facilitate cultural "fluency"  Fig. 2. Conceptual model of majority-group members' acculturation. At the individual level (dark-gray arrows), acculturation starts with the process of intercultural contact between majority-group members and individuals self-identifying as immigrants or minoritygroup members within a shared society. The frequency and quality of this contact, majority-group members' intergroup perceptions and attitudes, and majority-group members' individual differences (e.g., values, traits) influence the extent to which the intercultural contact leads them to adopt immigrant or minority-group cultures and also the degree to which they maintain their majority-group culture, which can vary by life domain. How majority-group members acculturate may further influence how they feel (i.e., psychological adaptation), how efficiently they navigate culturally diverse contexts (i.e., sociocultural adaptation), and their creativity and flexible thinking (i.e., cognitive adaptation). The striped arrow highlights the fact that there has been limited previous work on this latter process. The individual-level processes are likely to interact further with group and cultural factors and with socio-structural factors (light-gray arrows). (Doucerain, 2019). As majority-group members adopt values and worldviews from minority-group members, they may experience more fluent interactions in culturally diverse environments. This change may involve processes at a very basic cognitive level, including situational perceptions and automatic affective responses. For instance, majority-group members' adoption of new moral values can alter their perceptions of, and spontaneous emotional reactions to, different situations.

Group and cultural level
Our model also considers processes at the group and cultural level (see Fig. 2). Status differences between the majority and minority groups are one such factor. Societies are universally structured by group hierarchy; high-power groups have more access to resources than low-power groups do, and they often have control over low-power groups (Sidanius et al., 2016). Because people, particularly those who strongly endorse group hierarchies, tend to see group outcomes as zero-sum (a gain for another group is seen as a loss for one's own group), majority-group members may be resistant to adopt the culture of low-status minority groups (Guimond et al., 2013;Verkuyten, 2006). However, when majority-group members perceive that the inclusion of other groups' values, traditions, ideas, or skills makes the collective group stronger, they may be more willing to adopt various aspects that "newcomers" bring with them (Rink & Ellemers, 2008). This may especially be the case when majority-group members perceive that they share a common in-group identity with immigrants or minority-group members (e.g., an inclusive national identity; Gaertner et al., 2016;Rink & Ellemers, 2008).
Members of a high-power majority group may indeed adopt aspects of the cultures of individuals selfidentifying as immigrants or minority-group members but in a superficial way that reflects exertion of majoritygroup dominance in the form of cultural appropriation (Rogers, 2006) rather than "true" acculturation (i.e., a deeper, constructive engagement with new cultural content that may ultimately be adopted permanently). Although majority-group members may not acknowledge the role of dominance in this process, minority-group members often perceive cultural appropriation as a threat to their group's distinctiveness, which adversely affects intergroup relations (Mosley & Biernat, 2020). Hence, the impact of majority-group members' acculturation depends critically on its underlying motivations.
Motivations for maintaining different groups' distinctiveness appear to be particularly strong in contexts in which the social group in power constitutes a numerical minority in the society-historically in South Africa and currently in countries such as the United Arab Emirates. In these contexts, high-power numerical-minority groups can be expected to show little voluntary adoption of the low-power numerical-majority group's culture (Berry, 2017). In other words, where power and numerical size are dissociated, motivations to maintain, reinforce, or enhance power differentials play a particularly strong role, limiting the acculturation of members of the high-power, yet numerical-minority, group.

Socio-structural level
Societal ideologies, policies, and norms are likely to play an important role in majority-group acculturation. Societies that favor assimilation as an acculturation strategy, either by norms or by formal policy (Sam & Berry, 2016), are unlikely to encourage majority-group acculturation because immigrants and minority-group members are expected to adopt the standards of the majority-group culture, not vice versa. By contrast, multicultural societies that codify the accommodation of elements of different cultures in formal policy, such as through multilingual education, holiday celebrations, or other expressions of cultural traditions, are more likely to exhibit mutual acculturation and engage more actively and constructively with other cultures (Sam & Berry, 2016).

Future directions: cross-level research
Our model has the potential of suggesting cross-level research directions. Considering majority-group acculturation as involving both individual-level and groupand cultural-level processes helps illuminate how people self-identifying as immigrants or minority-group members can actively influence the culture of majoritygroup members during intercultural exchanges. Applying the minority-influence framework (Harkins et al., 2017) to acculturation offers insights into how minoritygroup members can actively facilitate majority-group acculturation and suggests group-and cultural-level factors (e.g., relative group size) that might moderate this effect.
Appreciating the potentially reciprocal group influences in the dynamics of acculturation also highlights the importance of the alignment between the preferred acculturation strategies of minority groups and the majority group (Bourhis et al., 1997), as well as of studying the mutual changes that may result (Berry, 2017;Horenczyk et al., 2013). For example, when the shared preference is integration, minority and majority groups may reciprocally adopt cultural elements from each other, which may ultimately lead to a new blended culture (Ward et al., 2018). The diffuse acculturation strategy repeatedly observed in previous work (see Fig.  1) may reflect an orientation toward such a culture shift.
Future qualitative and mixed-methods investigations may offer valuable insights into the everyday and longterm dynamics of majority-group members' acculturation. For instance, it is possible that majority-group members have clearer acculturation preferences in some domains (e.g., socialization, friendships) than others (e.g., traditions, values). Moreover, the diffuse cluster likely reflects not just one but rather several cultural styles that a detailed focus on group, cultural, and structural processes may help distinguish.
Cultural similarity, located in the group and cultural level of our model, may also systematically influence majority-group acculturation at the individual level (Schwartz et al., 2010). Similarity between majority and minority cultures may increase the likelihood that they evolve to become blended cultures, a process that involves significant majority-group cultural change. Conversely, dissimilarity between the cultures increases the probability that members of both minority and majority groups will perceive that the culture of the out-group threatens their own cultural values, symbols, and identities (Stephan et al., 2016). Thus, majoritygroup members may selectively choose to adopt the culture from more similar immigrant or minority-groups at a higher rate.
Individual-level processes can also operate in combination with socio-structural factors, such as the diversity of the environment. For majority-group members, adopting the ways (or cultural schemas) of other cultures may lead to more smooth and effective intercultural encounters, thereby reducing acculturative stress (Doucerain, 2019). However, this effect may occur primarily for majority-group members in socially diverse contexts, where being able to interact efficiently with members from other cultural groups is vital, and not in homogeneous majority-group environments. Moreover, mirroring the study of minority-group acculturation, the study of majority-group acculturation has thus far been primarily concerned with individual-level psychological changes. However, it is possible that immigrant and minority-group acculturation and majority-group acculturation occur primarily at different levels even though both individual-and group-level changes are involved in both cases. Among members of immigrant or minority groups, change may occur largely at an individual, psychological level. By contrast, majority-group acculturation may occur mainly at the group or societal level as the content of mainstream culture is modified by the incorporation of new cultural elements.

Conclusion
As societies rapidly become more diverse, they often become more vulnerable to a range of intergroup tensions. Mutual acculturation-changes in the majority group as well as among immigrant and minority groups-may not only foster greater intergroup harmony but also create more cooperative, productive, and healthy relations between individuals and groups. Greater attention to the study of the dynamics and consequences of majority-group acculturation is timely and potentially conceptually transformative as it defines majority-group members as recipients and individuals self-identifying as immigrants or minority-group members as agents of social change in a globalized world. Lefringhausen, K., Ferenczi, N., Marshall, T. C., & Kunst, J. R. (2021). (See References). A recent review of the field of majority-group acculturation and its relation to other frameworks. Verkuyten, M., Yogeeswaran, K., Mepham, K., & Sprong, S.

Transparency
Action Editor: Robert L. Goldstone Editor: Robert L. Goldstone

Declaration of Conflicting Interests
The author(s) declared that there were no conflicts of interest with respect to the authorship or the publication of this article.

ORCID iD
Jonas R. Kunst https://orcid.org/0000-0002-5319-1256 Note 1. Please note that we use the term "immigrants or minoritygroup members" for simplicity, while acknowledging the heterogeneity within and across minority and immigrant groups.