Educational intervention can rewire village social networks.
Marios Papamichalis, Laura Forastiere, Edoardo M Airoldi et al.
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In 30 seconds
This randomized controlled trial examined whether a 22-month public-health intervention altered social networks in 110 remote Honduran villages, involving 8,331 people. Villages varied in the proportion of households receiving the intervention, with villages receiving none as the primary reference group. In low-dosage villages (5-30% of households treated), treated people tended to sever ties with untreated people they had previously consulted for health advice; in high-dosage villages (50-100%), treated people increased their ties. Network changes generally persisted for three years after the intervention ended, while village-wide degree distributions remained relatively stable.
Key findings
- In low-dosage villages (5-30%), treated individuals tended to sever ties with untreated people they had previously approached for health advice.
- In high-dosage villages (50-100%), treated individuals increased their ties; treated-treated ties persisted or formed, while treated-untreated ties dissolved.
- Rewiring generally lasted for three years after the intervention ceased and affected friendship and financial ties as well as health-advice connections.
- The overall degree distribution of village-wide networks remained relatively stable despite changes in individual ties.
Why it matters
Public-health interventions may alter not only what people know but also whom they connect with. These network changes could influence how information spreads and how social relationships support collective action. The findings suggest that evaluating an intervention solely by its direct effects on recipients may miss broader, persistent changes in village social structure.
What to keep in mind
The study was conducted in remote Honduran villages, so the abstract does not establish whether these network effects generalize to other settings.