Introduction
Negative attitudes toward immigrants are common around the world. Previous scholarship has found that native populations often see immigrants as threats (Card, Dustmann, and Preston Reference Card, Dustmann and Preston2012, Hainmueller and Hopkins Reference Hainmueller and Hopkins2014; Scheepers, Gijsberts, and Coender Reference Scheepers, Gijsberts and Coender2002; Sides and Citrin Reference Sides and Citrin2007a, Reference Sides and Citrin2007b; Sniderman and Hagendoorn Reference Sniderman and Hagendoorn2007), with the presence of a large number of immigrants or (sudden) increases in the immigrant population fueling anti-immigrant sentiments (Burgoon and Rooduijn Reference Burgoon and Rooduijn2021), particularly when local residents believe their neighborhoods are directly affected (Cortina Reference Cortina2020; Ferwerda, Flynn, and Horiuchi Reference Ferwerda, Flynn and Horiuchi2017; Zorlu Reference Zorlu2017). Attitudes toward immigrants can also be influenced by factors such as media attention and public discourse (Hopkins Reference Hopkins2010), expert opinion (Kage, Rosenbluth, and Tanaka Reference Kage, Rosenbluth and Tanaka2022), the structure of the labor market (Peters et al. Reference Peters, Kage, Rosenbluth and Tanaka2019), and the welfare dependence and economic conditions of immigrants (Avdagic and Savage Reference Avdagic and Savage2021) and natives (Dancygier and Donnelly Reference Dancygier and Donnelly2013; Goldstein and Peters Reference Goldstein and Peters2014; Malhotra, Margalit, and Mo Reference Malhotra, Margalit and Mo2013; Scheve and Slaughter Reference Scheve and Slaughter2001).
One well-known strategy to soften negative sentiment toward out-groups is to increase social contact between in-groups and out-groups, supported by recent experimental studies that have found inter-group contact to reduce prejudice and discrimination (Finseraas and Kotsadam Reference Finseraas and Kotsadam2017; Finseraas et al. Reference Finseraas, Hanson, Johnsen, Kotsadam and Torsvik2019; Lowe Reference Lowe2021, Mo and Conn Reference Mo and Conn2018; Mousa Reference Mousa2020; Scacco and Warren Reference Scacco and Warren2018). By contrast, a growing number of studies on the related but distinct concept of exposure—being surrounded by members of the out-group through casual observation, without directly interacting with them—find that mere exposure to immigrants can negatively affect natives’ attitudes (Dinesen and Sønderskov Reference Dinesen and Sønderskov2015; Enos Reference Enos2014; Hangartner et al. Reference Hangartner, Dinas, Marbach, Matakos and Xefteris2019).
Interaction and exposure are inseparable in the real world as any interaction inevitably introduces exposure effects in its surroundings. Some studies thus examine social interactions and exposure simultaneously (Gijsberts, van der Meer, and Dagevos Reference Gijsberts, van der Meer and Dagevos2012; Vervoort, Flap, and Dagevos Reference Vervoort, Flap and Dagevos2011; Zorlu Reference Zorlu2017). Although perceptions of threat may grow with the number of immigrants (through exposure), opportunities for contact also increase, thereby leading to more positive attitudes in areas with many immigrants (Maxwell Reference Maxwell2019; Savelkoul et al. Reference Savelkoul, Scheepers, Tolsma and Hagendoorn2010).
While this paper simultaneously considers interactions and exposure, it goes a step further by arguing that even when interactions in the aggregate have a positive impact in locations with many out-groups, they can induce negative attitudes among natives in surrounding areas by increasing exposure. More precisely, even if an interaction with an immigrant has a positive effect on a native’s attitudes toward out-groups, the very same immigrant can harden the attitudes of other natives in the proximity of the interaction who do not enjoy opportunities for positive interaction. An important implication of the argument is that the same locality will harbor the strongest positive and negative attitudes toward out-groups—variation often concealed by limited data for smaller units of analysis.
Against this background, the main goal of the paper is to make a theoretical contribution to the literature by advancing our understanding of the conditions under which interactions have positive and negative effects on native attitudes toward out-groups. The paper also provides preliminary evidence for the joint effects of contact and exposure.
In my empirical analyses, I examine the effects of short interactions between Dutch natives and Muslim immigrants as well as their potential exposure effects. Muslim populations in Europe are often considered the group most likely to induce negative attitudes among native populations (Adida, Laitin, and Valfort Reference Adida, Laitin and Valfort2014, Reference Adida, Laitin and Valfort2016b; Blinder, Ford, and Ivarsflaten Reference Blinder, Ford and Ivarsflaten2019; Dancygier Reference Dancygier2017; Helbling and Traunmüller Reference Helbling and Traunmüller2020; Savelkoul et al. Reference Savelkoul, Scheepers, Tolsma and Hagendoorn2010; Sniderman and Hagendoorn Reference Sniderman and Hagendoorn2007).Footnote 1 This creates a problem for empirical research as natives who object to accommodating Muslims in their midst may already be living far away from them—that is, the spatial distribution of attitudes toward the Muslim population may be an artifact of natives’ initial preferences (see Logan and Molotch Reference Logan and Molotch1987; Modai-Snir and Plaut Reference Modai-Snir and Plaut2021; Zorlu and Lattens Reference Zorlu and Lattens2009, for discussion on residential sorting).Footnote 2
To address this problem, I administered a pre-registered, small-scale, field quasi-experiment on the outskirts of the city of Amsterdam, allowing me to systematically examine the joint effects of contact and exposure. I then conducted an online survey experiment which examined whether factors other than actual interactions could explain attitudes toward Muslims.
Contrary to my expectations, the field quasi-experiment found that short interactions did not reduce perceptions of threat. My analysis shows that when individuals directly interacted with Muslim confederates—research assistants going door-to-door with a petition unrelated to immigration—their support for out-groups decreased, while I did not detect a negative exposure effect.
A separate survey experiment investigated the reasons behind the negative attitudes observed in the interactions with the Muslim confederates. This survey experiment focused on the effect of visual characteristics and found that native Dutch respondents had strong negative reactions to the Muslim confederates’ religious appearance (i.e., wearing a headscarf) and Arabic facial features. The findings suggest that the negative effect observed in the field quasi-experiment is partially driven by perceived physical appearance and that short interactions were not enough to alleviate already-held negative perception. Overall, the paper’s findings indicate that short-term interactions may actually worsen negative attitudes toward Muslims due to the visual cues of their physical and religious appearances. This also highlights the challenge of promoting inter-group contact between natives and Muslims, as the importance of visual cues may prompt natives to avoid interactions with Muslims in the first place.
Research conducted in Western countries has consistently shown that Muslims face the highest levels of hostility (Adida, Lo, and Platas Reference Adida, Lo and Platas2018; Adida, Laitin, and Valfort Reference Adida, Laitin and Valfort2016b; Blinder, Ford, and Ivarsflaten Reference Blinder, Ford and Ivarsflaten2019; Helbling and Traunmüller Reference Helbling and Traunmüller2020; Savelkoul et al. Reference Savelkoul, Scheepers, Tolsma and Hagendoorn2010; Sniderman and Hagendoorn Reference Sniderman and Hagendoorn2007). This paper indicates that overcoming entrenched negative attitudes toward Muslims may require more than short positive interactions. To improve inter-group relations, future research may thus explore a range of other strategies, such as perspective-taking (Adida, Lo, and Platas Reference Adida, Lo and Platas2018), narrative persuasion, and non-judgmental listening (Broockman and Kalla Reference Broockman and Kalla2020) as well as longer-term interactions that can lead to meaningful social connection (McLaren Reference McLaren2003). However, it is important to note that even if an effective interaction strategy is identified, negative exposure effects may still occur, while non-Muslims may also visually sort out interactions with Muslims. Therefore, further research is needed to better understand what kinds of interactions benefit inter-group relations in real-life settings.
Argument
Threat Perceptions and Contact
This paper argues that studying inter-group interactions and exposure to out-groups through the same analytical lens is the key to better understanding spatial variation of attitudes toward out-groups. To this end, by building upon inter-group contact theory and ethnic competition theory, this section first elaborates on the relationship between perceptions of threat (which can be associated with exposure) and contact.
According to ethnic competition theories, natives tend to perceive immigrants as threats, which generates negative attitudes toward them (Coenders et al. Reference Coenders, Gijsberts, Hagendoorn, Scheepers, Gijsberts, Hagendoorn and Scheepers2004; Scheepers, Gijsberts, and Coender Reference Scheepers, Gijsberts and Coender2002). The expectation is based on two mechanisms. First, limited resources induce a sense of competition between social groups, leading to mutually negative attitudes (Scheepers, Gijsberts and Coender Reference Scheepers, Gijsberts and Coender2002). Perceived threats are deemed to be the direct cause of negative attitudes toward minority groups (Bobo Reference Bobo1983). Second, human beings have a psychological tendency to cultivate negative attitudes toward out-groups (Tajfel and Turner Reference Tajfel, Turner, Austin and Worchel1979). In particular, individuals tend to perceive their own group as superior to other groups and see negative characteristics in out-groups. Combining the two mechanisms, ethnic competition theories posit that this process of social identification against out-groups intensifies when natives perceive immigrants to be threatening (possibly based on actual inter-group competition) which leads to negative attitudes.
Perceptions of threat can be reduced through inter-group contact. According to inter-group contact theory, contact between members of different groups can reduce mutually held negative attitudes under conditions such as the existence of common objectives, equal status, favorable legal provisions, and friendship (Allport Reference Allport1954). A recent meta-analysis, however, suggests that these conditions are not necessary to elicit positive attitudes toward out-groups (Pettigrew and Tropp Reference Pettigrew and Tropp2006). While Paluck, Green, and Green (Reference Paluck, Green and Green2019) point to the lack of experimental research systematically examining scope conditions, more recent experimental research shows that short-term interactions that fall short of Allport’s optimal conditions can also induce more positive attitudes toward out-groups (Broockman and Kalla Reference Broockman and Kalla2016, Reference Broockman and Kalla2020; Choi, Poertner, and Sambanis Reference Choi, Poertner and Sambanis2023; Karim Reference Karim2020). For example, Broockman and Kalla (Reference Broockman and Kalla2020) find that 10-minute conversations are enough to soften people’s exclusionary attitudes toward transgender people and unauthorized immigrants.Footnote 3
Impact of Short Interactions
Still, the effects of interaction are generally difficult to pinpoint in real-life settings as people self-select whom they interact with; if individuals already have negative attitudes toward specific out-groups, they will likely avoid interacting with their members in the first place (Logan and Molotch Reference Logan and Molotch1987; Modai-Snir and Plaut Reference Modai-Snir and Plaut2021; Zorlu and Lattens Reference Zorlu and Lattens2009). Such selection effects are well documented, with natives residing in large cities tending to have more pro-immigrant views than their rural counterparts (Maxwell Reference Maxwell2019). In this context, short interactions (and exposure) are likely more relevant than full-fledged contact in real-life settings as residential (racial and ethnic) segregation continues to prevail across advanced democracies (Enos Reference Enos2017; Maxwell 2019, Reference Maxwell2020; Modai-Snir and Plaut Reference Modai-Snir and Plaut2021; Trounstine Reference Trounstine2018; Zorlu and Lattens Reference Zorlu and Lattens2009). Although individuals may commute to work, research finds that mobility remains informed by race and ethnicity and that workplace segregation remains substantial (Candipan et al. Reference Candipan, Phillips, Sampson and Small2021). This suggests that full-fledged contact is less likely than exposure and short interactions, and that even when full-fledged contact happens, it may well be initiated by people’s initial willingness to interact with out-groups.
What kinds of short interactions are relevant? Broockman and Kalla (Reference Broockman and Kalla2020) studied 10-minute conversations between natives and immigrants, while Choi, Poertner, and Sambanis (Reference Choi, Poertner and Sambanis2023) find that just overhearing a conversation of an immigrant can have a positive impact under some conditions. McLaren (Reference McLaren2003) argues that natives tend to perceive out-group members to have different morals, values, beliefs, and attitudes (see also Kinder and Kam Reference Kinder and Kam2009) and suggests that interactions can improve attitudes if they reveal that the immigrant has similar beliefs as natives. Indeed, Choi, Poertner, and Sambanis (Reference Choi, Poertner and Sambanis2023) only observed improved attitudes when conversations that natives overheard revealed that immigrants have progressive views on gender. The discussion thus far suggests that if contact involves verbal interactions that show immigrants think like natives, these interactions can soften in-group attitudes toward out-groups. Such positive interactions may also soften negative attitudes toward immigrants even when interactions are short in duration. From this, this paper derives the following baseline hypothesis:
H1: Direct interaction with immigrants including verbal conversation suggesting that they think similarly improves natives’ attitudes toward them.
Joint Effect of Interaction and Exposure
As indicated above, recent research shows that inter-group contact can positively affect people’s attitudes toward different groups. I argue that even short-term interactions can induce such improvements. But in contrast to the laboratory experiments that social contact research relies on—Mousa (Reference Mousa2020), Scacco and Warren (Reference Scacco and Warren2018), and Lowe (Reference Lowe2021) are recent exceptions—contact between social groups in the real world has an inevitable side effect: positive interaction in one location induces exposure to out-groups in the spatial proximity of the interaction.
Importantly, unlike interactions that individuals tend to self-select, exposure is more difficult to avoid. Exposure is therefore more likely to be experienced by members of diverse communities and to have greater real-life implications (Dinesen and Sønderskov Reference Dinesen and Sønderskov2015). A growing number of studies have found that exposure to immigrants negatively affects native attitudes (Dinesen and Sønderskov Reference Dinesen and Sønderskov2015; Enos Reference Enos2014; Evans and Ivaldi Reference Evans and Ivaldi2021; Hangartner et al. Reference Hangartner, Dinas, Marbach, Matakos and Xefteris2019). Enos (Reference Enos2014)’s large-scale field experiment in the USA found that negative attitudes toward out-groups (i.e., Hispanic Americans) increased when natives were exposed to randomly assigned Hispanic confederates, suggesting that mere exposure to immigrants can aggravate native attitudes in natural settings. Relying on a natural experimental setting in the Greek Aegean Islands, Hangartner et al. (Reference Hangartner, Dinas, Marbach, Matakos and Xefteris2019) found that mere exposure to refugees increased local residents’ hostility toward refugees, immigrants, and Muslim populations as well as support for restrictive asylum and immigration policies.
The theoretical framework attributes this aggravation of attitudes to exposure, which can increase perceptions of threat as natives observe immigrants without having actual interactions with them. Even when native colleagues may have positive interactions with their Muslim counterparts, other natives may only observe the presence of out-group members without opportunities to interact with them. Parallel to Enos (Reference Enos2014)’s findings, perceptions of threat may grow among natives in the proximity of such positive interactions. In addition to the visual exposure to immigrants, natives in the proximity of interaction may also mention the (sudden) presence of Muslims in the neighborhood during casual conversation.Footnote 4 I argue that this may have a similar effect to mere observation by increasing perceptions of threat, without the opportunities of contact to soften negative attitudes.
An assumption underlying the negative effect of exposure is that natives, in the aggregate, have baseline negative attitudes toward immigrants. If this is the case, interactions can potentially flip negative attitudes while negative attitudes are only aggravated through exposure. It is of course possible that the natives who observe interactions between natives and immigrants soften their attitudes, particularly when interactions appear to be positive (i.e., potential positive externalities of exposure). Recent findings also suggest that exposure to esteemed immigrant celebrities (e.g., Mohamed Salah, an Egyptian footballer who plays for Liverpool) can reduce natives’ negative attitudes toward immigrants with the same background (Alrababa’h et al. Reference Alrababa’h, Marble, Mousa and Siegel2021). Still, there are at least two reasons to believe that the negative effects of exposure are stronger than its positive effects. First, exposure can take place without observing actual interactions. Second, while natives who have positive interactions with immigrants may share their positive experiences with neighbors, areas of interaction are geographically smaller than exposure areas (partly due to the self-selection of interactions). It is thus likely that negative exposure effects diffuse more readily than positive interaction effects.
Overall, I expect that in a society where attitudes toward immigrants are on average negative, short interactions between natives and immigrants can induce more positive attitudes among natives, but with interactions creating negative exposure effects. From this, this paper derives the spatial hypothesis regarding contact:
H2: Attitudes toward out-groups become more negative among natives who are in the proximity of interaction but who do not directly interact with the same immigrants.Footnote 5
Examining the hypotheses contributes to the literature. Recent macro-level studies suggest that although perceptions of threat may heighten with the number of immigrants, opportunities for contact also increase, leading to more positive attitudes in areas accommodating many immigrants (Maxwell Reference Maxwell2019; Savelkoul et al. Reference Savelkoul, Scheepers, Tolsma and Hagendoorn2010). A key assumption is that contact between natives and immigrants occurs more often in these areas.
This paper challenges the prevailing assumption about interaction opportunities by arguing that they are not evenly distributed within localities, with some natives deprived of opportunities to interact with immigrants or actively seeking to avoid them. While natives living in large cities may on average have more interaction opportunities than natives living in rural areas, there still remains important spatial variation within localities in the extent of interaction opportunities (see also Musterd Reference Musterd2005). This is partly because immigrants tend to live and work in spatially segregated areas (see also Enos Reference Enos2017; Maxwell Reference Maxwell2019; Trounstine Reference Trounstine2018), partly because natives vary in their choice of activities that facilitate interaction with immigrants (Candipan et al. Reference Candipan, Phillips, Sampson and Small2021; Feld Reference Feld1981), and partly because some natives avoid interacting with immigrants.
It follows that even in the same city, some natives have many interaction opportunities while others just observe the presence of a large immigrant population. I then argue that the presence of immigrants has a positive effect on natives who have direct interactions with them, but that the same immigrants have a negative impact on natives who live and work in the vicinity and only experience exposure.
The study has implications for the literature on attitudes toward immigrants. If areas with more immigrants provide more interaction opportunities, I expect, on average, more positive attitudes toward immigrants there. But I also expect the strongest negative attitudes in such localities due to increased exposure and perceptions of threat stemming from large immigrant populations in parts of the same area. As research tends to aggregate individual attitudes within larger units such as municipalities or the European Union’s NUTS-3 regions (average population 150,000–800,000), scholars are likely to miss important variation within larger units (see also Dinesen and Sønderskov Reference Dinesen and Sønderskov2015; Sluiter, Tolsma, and Scheepers Reference Sluiter, Tolsma and Scheepers2015). Existing data from the Netherlands confirm this intuition. Using observational data (the Social and Cultural Developments in the Netherlands (SOCON) survey), Figure A.1 in the Appendix shows that while the three largest Dutch cities with the most immigrants—Amsterdam, The Hague, and Rotterdam—contain large number of natives who do not see immigrants as threats, the three cities also include natives who most strongly perceive minority groups as threatening. Figure A.2 in the Appendix also shows that attitudes toward immigrants in other cities are more uniformly distributed. Although this analysis is exploratory and cannot establish causal relationships, the figures indicate that the presence of a large number of immigrants may both improve and aggravate native attitudes toward them in the same area, which may, in the aggregate, conceal a hot spot of anti-immigration attitudes. Therefore, further research is needed to test the joint effects of contact and exposure more precisely, using smaller units of analysis. This motivates the field quasi-experiment below.
Research Design
Case Selection
I conducted a series of survey and field quasi-experiments to test the implications of the above-stated hypotheses about the joint effects of interaction and exposure. The Netherlands is geographically among the smallest of democracies, well-suited to examine my argument on micro-level interactions between members of in- and out-groups. Like many other European countries, there is significant anti-Muslim sentiment in the country (Savelkoul et al. Reference Savelkoul, Scheepers, Tolsma and Hagendoorn2010; Sniderman and Hagendoorn Reference Sniderman and Hagendoorn2007). According to polls conducted in March 2018, 38% of Dutch citizens identified migration and integration as the most pressing national issue (Ridder, Dekker, and Boonstoppel Reference Ridder, Dekker and Boonstoppel2018), and among various out-groups, Muslims are often regarded as the “unacceptable other” (de Koning Reference de Koning2016) (see also below for a more general discussion about Muslims in Europe).
The surveys also took place in 2018, with the 2015 immigration crises in Europe fresh in people’s memories. Thus, I expect Dutch natives to have, on average, negative attitudes toward Muslim immigrants, regardless of location. That is, people should tend to react to the presence of Muslim immigrants (i.e., exposure) negatively.
Still, like other European countries, the Dutch government adopts the so-called citizenship approach and encourages the integration of ethnic minorities into Dutch society (Poppelaars and Scholten Reference Poppelaars and Scholten2008)—in line with an underlying condition of the contact hypothesis (Allport Reference Allport1954). While Dutch natives are generally considered to be tolerant toward minorities, there is also a strong expectation that immigrants conform to Dutch values and standards of behavior (Gordijn Reference Gordijn2010). This has important implications for the scope conditions and research design of this paper. If Dutch people are on average quite tolerant but care a great deal about conformity to social norms, I expect that Dutch natives, despite their underlying negative attitudes at the time of the surveys (see also Appendix A9), can cultivate positive attitudes toward Muslims when they interact with them and perceive that Muslims share similar ideas and speak and behave like them, that is, when they perceive that Muslims are willing to conform to Dutch society and culture.
Empirical Strategy
This paper’s empirical strategy entails two steps. First, I present findings from a field quasi-experiment that examines the microfoundations of my hypotheses. More concretely, the experiment examines whether actual interactions with Muslims would overcome perceptions of threat and soften Dutch natives’ attitudes, while increasing threat perceptions in the proximity. The field quasi-experiment assigned two groups—Dutch native confederates and Muslim confederates—to two similar localities. The intervention was accompanied by a two-wave survey before and after the intervention. Second, I present results for an additional online survey experiment that tests which aspects of interactions with the Muslim confederates elicited negative attitudes in the field quasi-experiment (see below for more detail on each study’s design).
I also conducted another survey experiment to gauge Dutch natives’ baseline attitudes toward Muslims. The experiment examined whether a hypothetical relocation of Muslim refugees elicits negative attitudes among Dutch natives and how distance from the relocation point can affect their attitudes. The results suggest that Dutch people are, on average, reluctant to interact with Muslims, and consistent with the not-in-my-backyard (NIMBY) literature (e.g., Ferwerda, Flynn, and Horiuchi Reference Ferwerda, Flynn and Horiuchi2017), they do not want out-groups in your proximity. This confirms the paper’s assumption that Dutch natives generally have negative attitudes toward Muslims and are often reluctant to interact with them (more detailed research design and results can be found in Appendix A9).
Results
Field Quasi-Experiment
I administered the small-scale, field quasi-experiment between May and July 2018. The experiment was pre-registered at Open Science Framework. In the experiment, I recruited two groups of female research assistants from a Dutch university who served as confederates.Footnote 6 They were instructed to collect signatures for a petition for a neutral cause (see below) in the streets of a village right outside the city of Amsterdam where the majority of residents are native Dutch. The village is quite wealthy compared to other parts of the Netherlands. Without concerns about economic competition (Gerber et al. Reference Gerber, Huber, Biggers and Hendry2017), I expected the native residents of the village to be more likely to improve their attitudes toward out-groups through interaction with Muslim confederates.
The two groups of confederates—one consisting of two White individuals and the other of two individuals with Middle Eastern backgrounds wearing headscarves—were placed in two different but comparable streets in the same village for a few hours in the afternoon on two consecutive weekends. The streets were approximately 0.5–1 km apart. After arriving at pre-assigned households, the confederates rang the doorbells, explained their cause, and collected signatures for their petition. More specifically, they told residents that Dutch universities are dominated by students from cities, leaving rural areas under-represented, and that they were concerned that this limited social (not ethnic or religious) diversity may have broader implications for Dutch society. The main goal was to induce the idea that both groups of confederates care about the country, that they speak and behave like other Dutch people, and to cultivate positive attitudes toward Muslims. Although it is possible that some local residents disagree with the cause of the petition, they should also understand that the confederates care about the country.
All the confederates followed a strict protocol when introducing themselves and were instructed to follow the natural flow of the conversation depending on what residents brought up. Each group visited about 60 households and revisited the same streets in consecutive weeks to maximize coverage.Footnote 7 To ensure that the presence of the confederates was noticed by neighbors (i.e., exposure effect), they also spent time in the streets where they collected signatures before and after the campaign (see Section A3 in the Appendix for more detail about the intervention).
The field intervention with the two groups of confederates created two different treatment arms: (1) White confederates vs. Muslim confederates and (2) direct interaction vs. no direct interaction. The design yields four conditions: (1) exposure to White confederates; (2) exposure to Muslim confederates; (3) interaction with White confederates; and (4) interaction with Muslim confederates. Since this paper is interested in both the effects of interaction and exposure, I treat the first condition (i.e., exposure to White confederates) as the control group; since the White confederates look like other native Dutch residents, they were likely to be considered passersby. If my expectation is correct, I should see that those in the direct interaction area with the Muslim confederates softened their attitudes toward Muslims, while those in the no-direct interaction area with the Muslim confederates hardened their attitudes.
The intervention was not randomly assigned as the study only has two main treatment groups (i.e., interaction with White confederates and interaction with Muslim confederates) and it contacted all households on each street. The intervention is thus a field quasi-experiment. The main concern for the non-random treatment is that it may generate imbalances in covariates between the groups.Footnote 8 To ensure that the observable covariates between the groups are comparable, this paper adopted a two-wave survey and sought to control for differences in observed factors between the two groups. Table A1 reports summary statistics for the four treatment groups.
The surveys were conducted before and after the intervention to examine the intervention’s effect on residents’ attitudes. The surveys were constructed broadly and included many questions unrelated to immigration to lessen their connection to the field intervention. Households being the unit of analysis, I sent an invitation via mail to participate in the survey to each household in the village I could identify through publicly available information (N = 2, 965).Footnote 9 As Stedman et al. (Reference Stedman, Connelly, Heberlein, Decker and Allred2000) finds, response rates for mail survey are generally low and the rates have been declining over time. But due to budget constraints, I chose the mail survey over face-to-face surveys.
Survey responses were collected through the online survey platform Qualtrics. Respondents received invitation letters by mail with links to the survey and a unique registration code that enabled linking the two survey waves and the conditions to respondents. To encourage participation, I attached a small gift (a pen) to the letter, which stated that the study sought to understand which aspects of the residential area were important to residents. The surveys took about 10 minutes to complete. I collected 247 responses in the pre-intervention survey. Of these respondents, 137 participated in the post-intervention survey, which is the total sample size. Table A.2 reports attrition rates, which are comparable across the treatment groups except for “Interaction with Muslim confederates,” where I found residents to have lower attrition rates than for the other three groups.
The main dependent variable is Attitudes toward Muslims, measured both in pre- and post-intervention surveys.Footnote 10 The variable is based on responses on a 5-point Likert scale (1 = fully agree, 5 = fully disagree) to 13 items, taken from the Social and Cultural Developments in the Netherlands (SOCON) survey, which have been used in previous studies (e.g., Savelkoul et al. Reference Savelkoul, Scheepers, Tolsma and Hagendoorn2010). Sample items read “Muslims who wear a headscarf do not adjust to our society” and “Muslims raise their children in an authoritarian way” (see Section A2 in the Appendix for all items). I averaged across responses to obtain the measure of attitudes toward Muslims. The Cronchbach’s alpha was 0.91 in the pre-intervention measure and 0.93 in the post-intervention measure. Higher scores mean more positive attitudes toward Muslims. Table A.3 summarizes the dependent variables.
To control for differences between groups in the intervention, this paper took advantage of the two-wave panel survey and estimated the impact of interaction as well as the spatial impact of interaction on attitudes toward Muslims by using a difference-in-difference framework. This means that all the treatment variables are interacted with a time variable (i.e., Wave 2).
Following similar studies (Adida, Lo, and Platas Reference Adida, Lo and Platas2018; Broockman and Kalla Reference Broockman and Kalla2020; Savelkoul et al. Reference Savelkoul, Scheepers, Tolsma and Hagendoorn2010; Sniderman, Hagendoorn, and Prior Reference Sniderman, Hagendoorn and Prior2004), I performed ordinary least square regression analysesFootnote
11
and clustered standard errors on the level of participants. I also included pre-registered treatment covariates to adjust remaining imbalances across different treatment groups (see also Gerber and Green Reference Gerber and Green2012). In all analyses, I controlled for respondent gender, age (in years), education, ethnicity, household income, duration of residence, and spatial distance to the intervention point (km). Specifically, point estimates and confidence intervals are calculated from the following regression form:
${Y_{it}} = \alpha + \beta Conditio{n_i} + \gamma Wav{e_t} + \delta \left( {Conditio{n_i} \cdot Wav{e_t}} \right) + \lambda Covariat{e_i} + {\varepsilon _{it}}$
, where
$Conditio{n_i}$
is the treatment group-specific effect, Wavet is the time trend common to the control and treatment groups, and
$Covariat{e_i}$
is a vector of control variables. A full regression table is reported in Table A.4 in the Appendix.Footnote
12
Following Brambor, Clark, and Golder (Reference Brambor, Clark and Golder2006), I illustrate marginal effects of treatments in Fig. 1 (see Figure A.4 for the marginal effects with standard errors).
Marginal effects of contact and exposure.
Note: N = 274.
Figure 1 indicates that respondents who did not interact with the confederates did not experience any significant changes in their attitudes over time (“Indirect contact White confederates” and “Indirect contact Muslim confederates” in the figure). Accordingly, I did not find the sudden presence of Muslims to have any significant impact on residents in the vicinity of the interaction (
$\beta = 0.02$
,
$SE = 0.09$
,
$p = 0.78$
), which is not consistent with H2.
Importantly, Fig. 1, along with the top panel of Figure A.4 and Table A.4, shows that relative to the pre-intervention measure, in the post-intervention measure, those who had direct interaction with the Muslim confederates reported significantly less positive attitudes toward Muslims.
It is possible that residents who interacted with the Muslim confederates already had hardened attitudes toward Muslims, and that their attitudes had little to do with the interaction. But comparing the trends in the attitudes of residents in the same area (i.e., those who interacted with the Muslim confederates and those who live in the surroundings), this explanation may be unlikely.
Participation rates may also have affected the results. The rates varied between the treatment groups: 30 out of 62 households (48.3%) in the Muslim confederate street opened the door, compared to 40 out of 57 households (70.1%) in the White confederate street. Lower participation in the Muslim confederate street could have been driven by residents’ pre-existing antipathy toward Muslims.Footnote 13 If this is the case, the negative interaction effect the study found could well be under-estimated.Footnote 14 Still, this is only speculation, and it is also possible that the residents were simply not present at the time of the confederates’ visits.
Interestingly, the figure also shows that interactions with White confederates had a negative impact on residents’ attitudes toward Muslims. This negative effect may have been attributed to residents perceiving university students as more liberal (Thijs, Grotenhuis, and Scheepers Reference Thijs, Grotenhuis and Scheepers2018), with the confederates’ promotion of a petition on social diversity possibly causing annoyance and a backlash. While this remains speculative and the effect is not statistically significant at the 10% level, the results suggest that discussions on diversity alone may have a negative impact on attitudes toward Muslims, even in the absence of direct interactions or exposure to Muslims. This, in turn, highlights widespread hostility toward Muslims in Dutch society and the need for further research to better understand the underlying factors contributing to this phenomenon.
As for other covariates, Table A.4 in the Appendix that includes the findings for the covariates shows that all else equal, more-educated respondents are more likely to exhibit positive attitudes toward Muslims than less-educated counterparts, which is consistent with general findings about the relationship between education and attitudes toward immigrants (Hainmueller and Hopkins Reference Hainmueller and Hopkins2014; Hainmueller and Hiscox Reference Hainmueller and Hiscox2007). The table also shows that non-binary respondents are more likely to be supportive of Muslims than male counterparts. This is somewhat surprising in light of previous studies on the conflicting relationship between Islam and its perceived gender views (Eskelinen and Verkuyten Reference Eskelinen and Verkuyten2020; Kwon, Scarborough, and Taylor Reference Kwon, Scarborough and Taylor2023). However, it is consistent with previous research showing that non-binary individuals tend to be politically liberal (Worthen Reference Worthen2020).
One caveat is that the field quasi-experiment is under-powered due to a number of non-responses. Although the other studies (the online survey below and another survey in the Appendix) compensate for this limitation and provide important findings, there is a need for further research to systematically investigate the joint effect of interaction and exposure.
The next study aims to investigate why residents’ attitudes were negatively impacted by interactions with Muslim confederates in the field quasi-experiment. According to the confederates as well as an independent observer (another research assistant who monitored the door-to-door visits), interactions with residents were equally positive and smooth. The residents, however, may have judged their interactions with the Muslim confederates more negatively due to their physical appearance. Alongside physical markers of race and ethnicity and the presence or absence of a headscarf, the confederates may have had other physical characteristics less related to ethnicity or race but commonly perceived as signaling kindness and trustworthiness, for example, neoteny or facial attractiveness. To examine these, the study conducted a separate online survey.
An Online Survey
To investigate the appearance effect, I took photos of the confederates’ faces and had them rated by an independent sample of Dutch residents in December 2018. The sample was drawn from an online panel of Dynata.Footnote 15 The number of observations was 1,810.Footnote 16
All pictures were standardized for background, lighting, angle, distance, and facial expression. The photos were cropped so that only the face and neck were visible and were aligned so that the eyes were centered. For each confederate, I took three pictures: one with a headscarf and a neutral expression, one without a headscarf and a neutral expression, and one with a headscarf and a smiling face.Footnote 17
The literature generally suggests that physical appearance can influence how individuals are treated (Hamermesh Reference Hamermesh2011), and this can also be true in inter-group relations (Kleider-Offutt, Bond, and Hegerty Reference Kleider-Offutt, Bond and Hegerty2017; Maddox and Perry Reference Maddox and Perry2017). Moreover, studies have highlighted that racial phenotypicality, which refers to observable physical traits associated with a person’s race, can have an impact on how individuals are evaluated. For instance, White Americans are more likely to negatively evaluate Black Americans with more Afrocentric facial features (Blair, Judd, and Fallman Reference Blair, Judd and Fallman2004), while young Black men are perceived as more physically threatening than young White men (Wilson, Hugenberg, and Rule Reference Wilson, Hugenberg and Rule2017).
Negative treatment toward out-groups can often stem from implicit negative attitudes toward the physical appearances of non-White individuals, as in many cultures, physical features associated with White Eurocentric phenotypic characteristics are considered more desirable (Maddox Reference Maddox2004). These preferences for certain facial characteristics can then influence how individuals are categorized and perceived, ultimately impacting social interactions and group dynamics (Maddox Reference Maddox2004). In the context of this paper, it is thus possible that Muslim confederates with Arabic facial features may be perceived as out-group members in Dutch society because they lack typical White Eurocentric phenotypic characteristics. This can result in the confederates being subject to existing biases associated with out-group membership by Dutch natives.
The wearing of a headscarf is another notable appearance feature among many Muslim women.Footnote 18 Attitudes toward the hijab are complex and multifaceted, with some viewing it as a symbol of religious freedom (Howard Reference Howard2007),Footnote 19 while others see it as incompatible with Western liberal values (Foner and Alba Reference Foner and Alba2008). In Europe, many people have generally positive attitudes toward Muslims, but non-Muslims often have concerns about the role of religion in society, particularly regarding the hijab, which is often viewed as a symbol of illiberal values and as a sign of women’s unwillingness to integrate (der Noll et al. Reference der Noll, Saroglou, Latour and Dolezal2018; Helbling Reference Helbling2014). In fact, a survey by Helbling (Reference Helbling2014) reported that about one-quarter of respondents were opposed to Muslims, while almost 60% disagreed with the practice of women wearing a headscarf. These findings align with previous research indicating that in the Netherlands, many natives express more opposition to Muslim cultural norms than Muslims themselves (Sniderman and Hagendoorn (Reference Sniderman and Hagendoorn2007); see also de Koning (Reference de Koning2016)). As such, within the context of this paper, it is possible that Dutch natives may perceive Muslim confederates wearing a headscarf negatively, as the hijab is viewed by some as a symbol of embracing illiberal values and a lack of willingness to integrate into Dutch society.
In the online experiment, I investigate the impact of both physical features simultaneously—whether wearing a headscarf and/or having Arabic facial features result in negative evaluations. A study conducted by Adida, Laitin, and Valfort (Reference Adida, Laitin and Valfort2016a) in France also examines the impact of religious symbols (on job applications) while controlling for other physical features. However, their study did not specifically examine the impact of wearing a headscarf and its relative importance compared to other physical features. As discussed earlier, it is possible that both physical and religious appearances of the Muslim confederates may affect evaluations of the confederates. But in line with the Dutch “myth” of color-blindness (see Rose Reference Rose2022, for counter-evidence based on her own experience), it is also possible that neither appearance feature is important, and the negative evaluations observed in the field quasi-experiment may be attributed to other factors.
With the motivation in mind, I randomly showed respondents one of the following three kinds of photos: (1) photos with a headscarf, without a smile; (2) photos without a headscarf, without a smile; and (3) photos with a headscarf, with a smile. I showed each respondent four photos of two White confederates and two Muslim confederates. I also randomized the order of the four photos to avoid an order effect. The main design is summarized in Table A.8 in the Appendix. With this design, I sought to estimate (1) the impact of ethnic appearance (i.e., White vs. Arabic); (2) the impact of religious appearance (i.e., with or without a headscarf); and (3) the impact of positive impression (i.e., with or without a smile). Figure 2 shows a sample of (modified) photos that I presented to respondents.
Examples of photos.
Note: I blurred the photos to protect privacy. Since the blurred photos do not show facial expression, I do not show the smiling photos.
Facial ratings served as dependent variables. Upon seeing photos of the confederates’ faces, survey respondents rated to what extent they perceived the confederates as (1) being friendly, (2) reliable, and (3) belonging to Dutch culture on a 5-point Likert scale. Higher values indicate that confederates were rated as friendlier, more reliable, and more belonging in the Netherlands. After rating the faces and clicking the “next” button, respondents read the following text: “The girl in the photo is a promising foreign student at a university in the Netherlands and would like to stay in the Netherlands. If it was up to you, would you grant her a permanent residence permit?” (1 = absolutely no, 5 = absolutely yes). I use these four questions as the dependent variables (Likability; Reliability; Fitting-in; and Admission preference).
I conducted four separate regression analyses for the dependent variables. Standard errors were clustered among respondents. This is because each respondent rated four pictures, meaning the data are nested. As in the field quasi-experiment, I used linear regressions including covariates.Footnote 20 The results are presented in Fig. 3.Footnote 21
The impacts of physical appearances on attitudes.
Note: Horizontal lines denote 90% confidence interval. N = 1,810.
For friendliness and reliability (i.e., personal impression), the upper panel of the figure shows that compared to White faces, Arabic faces were rated as friendly but not reliable. Wearing a headscarf does not affect Dutch respondents’ ratings of friendliness and reliability. Overall, the religious and ethnic characteristics of the confederates show either null or mixed findings at best. Unsurprisingly, (compared to neutral faces) smiling increased respondents’ ratings positively both in terms of friendliness and reliability, the coefficient being the largest for this variable.
Regarding integration issues, this paper finds a gloomy picture for the Muslim confederates and for the Muslim population in the Netherlands more generally. The bottom panel of the figure shows that both Arabic and Muslim appearances consistently led to negative ratings. More specifically, native Dutch respondents were more likely to judge that they do not fit in the Netherlands when their face looked Arabic and they wore a headscarf. Smiling faces were still rated significantly higher for fitting in the Netherlands. Finally, respondents were less likely to grant a permanent residence permit when the confederates looked Arabic. The negative effect was even stronger for those wearing a headscarf. Unsurprisingly, the study found that smiling does not generate a residence permit.
In summary, the online survey finds that when it comes to integration issues, the Muslim confederates were more likely to be punished simply because of their ethnic (visual) background or religious symbols. The negative impact of wearing a headscarf on evaluations was greater than that of having Arabic facial features, possibly due to more explicit associations between the hijab and illiberal values (see also der Noll et al. Reference der Noll, Saroglou, Latour and Dolezal2018; Helbling Reference Helbling2014). Previous research has also shown that people tend to avoid interacting with those who look visibly different (Dietrich and Sands Reference Dietrich and Sands2023; Walker and Hewstone Reference Walker and Hewstone2006), which, when combined with the findings of this paper’s empirical analyses, highlights the challenges in promoting social interactions between Muslims and non-Muslims.Footnote 22 While the role of visual cues may lead non-Muslims to avoid interactions with Muslims, the field quasi-experiment above also suggests that even if interactions occur, short-term positive interactions alone are insufficient in overcoming ingrained prejudice associated with Muslims. Therefore, it is crucial to develop more effective strategies to improve inter-group relations. The concluding section will discuss the policy implications of the findings.
Conclusion
In our era of global migration, social scientists have pondered how to best reduce perceptions of threat many natives attach to new immigrants and refugees. While much research suggests that interactions between natives and immigrants can ease the challenges of integration, we need to know more about whether the alleged benefits of interaction also apply to Muslim immigrants in western countries and whether inter-group interaction can produce negative externalities in the real world. This paper drew on the recent literature on social contact to argue that short interactions with Muslim immigrants can lead natives to believe that immigrants are like them, which would soften their attitudes toward out-groups. I then argued that the exclusion of natives from the inclusive bubble in the area surrounding the same interactions may in fact harden their attitudes. The implication is that there will be both strong pro-immigrant and anti-immigrant attitudes in places where many immigrants reside and work.
I tested the hypothesis of interaction and exposure in the Netherlands where natives are considered to be tolerant toward minority groups. Contrary to the predictions, the studies showed that interacting with Muslims did not lessen native perceptions of threat but instead aggravated them. Importantly, the hardening of attitudes toward out-groups was more severe among natives who had direct interaction with Muslims than among natives who did not have direct interaction but resided in the proximity of the interaction. This finding is not consistent with the hypotheses and prompts researchers to re-consider the conditions under which interactions indeed reduce perceptions of threat.
The second survey that focused on visual characteristics revealed that having Arabic facial features and religious symbols results in negative evaluations of Muslim immigrants. The findings suggest that the negative effect observed in the field quasi-experiment is, to some extent, driven by perceived physical appearance and that short interactions were not enough to alleviate already-held negative perception. In summary, the paper’s findings highlight the potential of short-term interactions to exacerbate negative attitudes toward Muslims, given the salience of their ethnic and religious appearances. The findings also underscore the challenges in promoting inter-group contact between natives and Muslims, as visual cues may lead natives to selectively avoid interactions. These results emphasize the need for more effective integration tools to mitigate negative attitudes toward Muslims and foster meaningful inter-group interactions.
Muslims in Europe are often perceived as a threat (Adida, Laitin, and Valfort Reference Adida, Laitin and Valfort2016b; Blinder, Ford, and Ivarsflaten Reference Blinder, Ford and Ivarsflaten2019; Dancygier Reference Dancygier2017; Savelkoul et al. Reference Savelkoul, Scheepers, Tolsma and Hagendoorn2010; Sniderman and Hagendoorn Reference Sniderman and Hagendoorn2007), and research has shown that Muslim immigrants in Europe are often perceived to have differing political views from the native population (Choi, Poertner, and Sambanis Reference Choi, Poertner and Sambanis2023; Helbling Reference Helbling2014). Therefore, it may be more effective to demonstrate not just that Muslim immigrants care about Dutch society but also that they have similar political beliefs and care about Dutch society politically in the same way that Dutch natives do. Future research could thus explore a range of strategies, such as perspective-taking (Adida, Lo, and Platas Reference Adida, Lo and Platas2018), narrative persuasion, and non-judgmental listening (Broockman and Kalla Reference Broockman and Kalla2020), to improve mutual understanding about political views. However, it is important to note that even if an effective interaction strategy is identified, negative exposure effects may still occur, and natives may also visually sort out interactions. Therefore, further research is necessary to better understand what types of inter-group interactions benefit inter-group relations in real-life settings.
Supplementary material
The supplementary material for this article can be found at https://doi.org/10.1017/rep.2023.15
Acknowledgments
I thank Claire Adida, Gizem Arikan, Rachid Azrout, Brian Burgoon, Graeme Davies, Jocelyn Evans, Florian Foos, Yusaku Horiuchi, Trevor Incerti, Yoshiharu Kobayashi, Mike Medeiros, Yusuke Narita, Steve Pickering, Matthijs Rooduijn, Frances Rosenbluth, Jessica Trounstine, Floris Vermeulen, Yuleng Zeng, and audiences at workshops of the University of Amsterdam, Brunel University London, and the European Political Science Association for their comments and suggestions. I am also grateful to the editor and the three anonymous reviewers for their careful reading of the paper and their comments. I also thank Marina Tulin who contributed to the project from the beginning; this research would not have been possible without her. Laurien Bender, Senja Borgers, Marly Bos, Robin Dullaert, Hayet Elabed, Lisa Lemmen, Sarah Motlagh, Philip Rakhou, Wies van der Stroom, and Anne-Sophie van Gulpen provided excellent research assistance. I also thank the University of Amsterdam’s Political Economy and Transnational Governance (PETGOV) program for generous support of this project. The human subject protocol of the research was evaluated and approved by the Ethics Advisory Board, Amsterdam Institute for Social Science Research, University of Amsterdam, and the research was conducted following the approval.
Competing interests
The author declares there is no conflict of interest.
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