Leveraging Virtual Contact and Social Networks to Foster Interethnic Harmony

This paper investigates whether virtual contact — exposure to an outgroup through a documentary film — can promote interethnic harmony, and whether targeting network-central individuals amplifies effects on untreated community members. The study addresses a context of deep, historically rooted discrimination: the Santal ethnic minority in northwestern Bangladesh have faced colonial-era land dispossession, ongoing violence, labor market discrimination, and structural exclusion by the Bengali ethnic majority. The Santals are the second-largest ethnic-minority group in Bangladesh; in the study villages, their share ranges from 13% to 83% of the population.

The authors conducted a cluster-randomized field experiment across 121 multiethnic villages in the Rajshahi and Naogaon districts of Bangladesh, involving over 3,300 households. Villages were randomly assigned to three arms: a random treatment arm (RR, 40 villages, N=562 Bengalis) in which approximately 14 randomly selected ethnic-majority households per village watched a 45-minute documentary film (“Ami Santal” / “I Am Santal”) portraying Santal culture, economic hardships, and aspirations; a central treatment arm (41 villages) in which approximately 7 randomly selected Bengalis (RC) and 7 network-central Bengalis identified via a diffusion-centrality nomination exercise (CC) watched the same film; and a control arm (40 villages) in which households watched a placebo documentary on flower farming. The documentary, costing approximately $13 per participant, was screened individually at participants’ homes on tablets. Data were collected at baseline (September–October 2022), first end line approximately 3 months post-screening (February–March 2023), and a casual-work field experiment second end line approximately 4.5–5 months post-screening (April–May 2023). Outcomes were measured via lab-in-the-field experiments (dictator game, solidarity game), an experimentally validated interethnic trust survey item (Falk et al. 2018), self-reported behaviors, administrative police complaint data, and facial emotion detection during screening.

The main findings are as follows. First, treated Bengalis in the central arm (RC) gave 14.7% more in the dictator game (p < .01) and exhibited 21.7% greater trust toward Santals (p < .01) compared to controls; RR participants showed a 7.1% increase in solidarity game giving (p < .10) and 11.8% greater trust (p < .01). Effects on reducing negative stereotypes and discriminatory opinions were not statistically significant, suggesting that affective components of prejudice are more responsive to the intervention than cognitive components. About 82% of treated Bengalis reported acquiring new information about Santals, primarily regarding occupational struggles, educational aspirations, and economic potential. Facial expression analysis using emotion-detection software found sadness to be significantly more prevalent among viewers (p < .05), particularly among network-central participants, consistent with an empathetic response.

Second, untreated Bengalis in the central arm — who never watched the documentary — showed 20.9% higher altruism (p < .10), 27.3% higher solidarity (p < .05), and 8.1% higher trust (p < .05) toward Santals relative to controls. No significant effects on untreated Bengalis were found in the random arm. Untreated Santals in both arms exhibited greater trust toward Bengalis (11% increase in random arm, p < .05; 21.7% increase in central arm, p < .01) and higher subjective well-being (p < .01 in both arms). Village-level administrative data show a significant reduction in Bengali police complaints against Santals post-intervention (p < .05), but only in the central arm.

Third, in the casual-work field experiment, multiethnic pairs jointly produced paper bags under piece-rate compensation. Overall productivity increased approximately 5% (p < .05) in the central arm only. Both Bengali and Santal workers increased productivity specifically in the finisher role — the most critical role for determining earnings — in the central arm. The authors interpret Bengali productivity gains as reflecting increased prosociality toward Santal co-workers, and Santal productivity gains as reflecting conformism or peer pressure in response to Bengali effort. The scope of all effects is limited to multiethnic villages in northwestern Bangladesh, a context of historically severe and ongoing majority-minority inequality; the intervention deliberately did not challenge the socioeconomic hierarchy of the villages.

Q: What was the documentary film’s content and design rationale? A: The 45-minute film “Ami Santal” featured three narrative layers: Santal culture (rituals, cuisine, the Baha festival), economic hardships (housing, water access, low incomes, labor market struggles, educational barriers), and aspirational stories of Santals who achieved success. All stories were narrated by non-actor local Santals, filmed outside the study region, and deliberately avoided attributing blame to Bengalis. The film was designed under the supervision of anthropologists at the University of Rajshahi to maintain ethnographic authenticity and a non-moralistic, observational tone (moral judgment language was much lower than in comparison Bangladeshi documentaries and general films, per LIWC-22 analysis).

Q: How were network-central individuals identified and why might targeting them matter? A: In central-arm villages, enumerators surveyed approximately 18–20 randomly selected passers-by at village markets and asked them to nominate the 15 people most effective at disseminating information. The seven most consistently and highly ranked individuals per village were selected as network-central (CC). These individuals were expected to have high diffusion centrality — meaning information they receive spreads widely — so targeting them with the documentary could shift attitudes and behavior among untreated community members through persuasion, visibility, credibility, or diffusion (the paper cannot separately identify which mechanism operates).

Q: What were the primary behavioral effects on treated Bengalis (the ethnic majority who watched the film)? A: Randomly selected participants in the central arm (RC) gave 14.7% more in the dictator game (p < .01) and 8% more in the solidarity game (not statistically significant), and exhibited 21.7% greater trust toward Santals (p < .01), all relative to controls. In the random arm (RR), participants showed a 6.4% increase in dictator game giving (not statistically significant), a 7.1% increase in solidarity game giving (p < .10), and 11.8% greater trust toward Santals (p < .01). Effects on self-reported behaviors — interethnic friendships, social interactions, amount charged to minorities for water — were not statistically significant.

Q: Did the intervention change Bengali stereotypes or discriminatory opinions toward Santals? A: No. Despite treated Bengalis acquiring substantial new information (approximately 82% reported learning new things, primarily about Santal occupational struggles and educational aspirations), the authors find no significant effects on the stereotypes index or the discriminatory-opinions index among treated Bengalis. They propose two explanations: cognitive components of prejudice (stereotypes) are harder to change through indirect contact than affective components (emotions, prosocial behavior), consistent with Tropp and Pettigrew (2005) and Turner, Crisp, and Lambert (2007); and a single documentary may be insufficient to counter deeply ingrained generational biases due to resistance to change.

Q: What emotional responses did the documentary elicit, and how was this measured? A: Field assistants took candid photographs of participants’ faces at a random point during the screening; these were analyzed using Emotimeter software (machine learning-based emotion detection) that assigns scores across seven emotion categories summing to 100%. Sadness was significantly more prevalent among documentary viewers compared to placebo viewers (p < .05), particularly among network-central participants (CC). The authors interpret this as consistent with an empathetic response to the film’s content about Santal hardships, and connect it to increased prosocial behavior via emotion-regulation mechanisms (alleviating sadness through prosocial action).

Q: What were the spillover effects on untreated Bengalis in the central arm? A: Untreated Bengalis in central-arm villages — who never watched the documentary — showed 20.9% higher altruism (p < .10), 27.3% higher solidarity (p < .05), and 8.1% higher trust toward Santals (p < .05) relative to controls. By contrast, untreated Bengalis in random-arm villages showed no statistically significant effects on any of these outcomes. The authors attribute the central-arm spillovers to the presence of network-central individuals being treated in those villages, though whether these patterns reflect persuasion, visibility, credibility, or information diffusion cannot be separately identified.

Q: How did the intervention affect the Santal ethnic minority (who never watched the documentary)? A: Untreated Santals in both arms exhibited greater trust toward Bengalis: an 11% increase in the random arm (p < .05) and a 21.7% increase in the central arm (p < .01) compared to controls. Santals in both arms also reported higher subjective well-being (p < .01). A weakly significant increase in food security was observed among Santals in the central arm (p < .10), possibly reflecting increased material support from Bengalis. No statistically significant effects were found on Santal altruism or solidarity.

Q: What did the village-level administrative complaint data show? A: Using data collected from two police stations covering all 121 villages, the authors find a significant reduction in Bengali complaints against Santals post-intervention in the central arm (p < .05). No significant reduction was found in Santals’ complaints against Bengalis (p > .10) in any arm. Data from village counselors’ offices (shalish arbitration complaints) showed no significant change in any arm. The distinction matters because police complaints involve more serious, violent matters, while village-counselor complaints involve routine arbitration.

Q: How was the casual-work field experiment designed, and what did it find? A: Approximately 4.5 months after the documentary screenings, 720 participants (360 Bengalis, 360 Santals) drawn equally from the three study arms were paired into multiethnic dyads to jointly produce paper bags for a local supplier under piece-rate compensation, with earnings split equally. One worker was randomly assigned the preparer role and the other the finisher role; roles were switched halfway through the three-hour session. The paper finds an approximately 5% overall productivity increase (p < .05) in the central arm only, concentrated in the finisher role (the role most critical for final output). Bengalis and Santals both increased productivity specifically as finishers in the central arm.

Q: What mechanisms explain the productivity effects in the casual-work experiment? A: For Bengali finishers, the productivity gain is interpreted as prosocial behavior: treated Bengalis who showed greater altruism toward Santals worked harder to increase the earnings of their Santal co-workers. For Santal finishers, the productivity gain is interpreted as conformism or peer pressure: Santals increased effort more when they worked as finisher after swapping roles (i.e., after observing Bengalis’ higher effort as finisher first), suggesting responsiveness to the higher productivity of Bengalis rather than an independent prosocial motivation. The authors present a simple theoretical model to formalize these interpretations, citing Rotemberg (1994) on prosocial effort and Kandel and Lazear (1992) and Mas and Moretti (2009) on peer pressure mechanisms.

Q: Why was virtual rather than direct contact used in this intervention? A: The authors argue that encouraging direct contact between Bengalis and Santals in this setting carries specific risks: the unequal status of the groups may generate anxiety during interactions, potentially limiting engagement or provoking backlash. By contrast, the documentary provides an indirect, low-cost ($13 per participant) form of contact that presents Santal lives without disrupting the socioeconomic hierarchy of the villages and without attributing blame to Bengalis. The film’s entertaining veneer and emotional storytelling make it more scalable and logistically feasible in contexts where direct contact is socially difficult or impractical.

Q: What are the primary limitations acknowledged by the authors? A: The authors acknowledge that the study’s sampling protocol relied on a door-to-door skip procedure without systematic records of approached households, raising the possibility of convenience or snowball-type recruitment and potential deviations from random sampling — this is reflected in some imbalances in baseline characteristics across arms. CC-control comparisons are explicitly descriptive (not causal) because network-central individuals were selected on centrality. Differential attrition was found among untreated Santals (both treatment arms had significantly lower attrition than control, p < .05), which could bias estimates for that subgroup. The authors cannot separately identify the mechanisms (persuasion, visibility, credibility, diffusion) underlying spillover effects in central villages.

Q: What are the policy implications of this study? A: The findings suggest that media-based virtual contact interventions are a low-cost, scalable tool for improving interethnic prosociality even in contexts of deep-rooted discrimination where direct contact may be socially impractical. Targeting network-central individuals — identified via a simple nomination exercise requiring no pre-existing network data — amplifies village-wide effects, including among untreated community members and the minority group itself. The productivity gains in multiethnic work teams imply that improved interethnic relations can have tangible economic consequences beyond attitudinal change. However, the null effects on stereotypes and discriminatory opinions suggest that single documentary interventions may not be sufficient to alter deep-seated cognitive biases, and more intensive or repeated interventions may be needed to achieve durable attitude change.

Virtual contact: Indirect exposure to an ethnic outgroup through a documentary film, as distinct from direct intergroup contact; posited to influence majority-group attitudes and behavior by increasing empathy and identification with the outgroup without requiring face-to-face interaction.

Diffusion centrality: A network measure of how effectively an individual can spread information through a community, operationalized via a nomination exercise in which community members identify those best positioned to disseminate information; used to select the seven highest-ranked individuals per village for targeted treatment.

Prosociality (altruism and solidarity): Measured using incentivized lab-in-the-field games — the dictator game (unilateral allocation of an endowment to a passive outgroup recipient) and the solidarity game (precommitted transfers to an outgroup member who may incur a random loss) — capturing willingness to benefit non-coethnic others at personal cost.

Affective versus cognitive components of prejudice: A distinction between emotional aspects of prejudice (feelings, empathy) — which the authors find to be more responsive to the documentary intervention — and cognitive aspects (negative stereotypes, discriminatory opinions) — which show no significant change despite new information acquisition.

Spillover effects (untreated individuals): Changes in behavior or attitudes among community members who did not directly receive the intervention (did not watch the documentary), attributed to the influence of treated individuals in their village, particularly network-central individuals in the central arm.

Piece-rate casual-work field experiment: A second end line in which multiethnic pairs of Bengali and Santal workers jointly produced paper bags for a local supplier, with individual earnings determined by joint piece-rate output; designed to measure whether improved interethnic attitudes translated into higher workplace productivity in ethnically mixed teams.

Source text origin: The provenance classification of the text used to generate a paper summary (full PDF, open-access HTML, or abstract only); the paper’s pipeline rules impose a hard block on abstract-only summarization.