Unformatted text preview: Introduction Introduction to Sociology Part III: The Architecture of Society
Lecture 20: Social Influence and Diffusion and Diffusion
Wednesday, April 22 April 22 Causes Causes of Homophily
• Desire to minimize cognitive stress and strain (especially important with Desire to minimize cognitive stress and strain (especially important with respect respect to value homophily) • Perceived relatability - Social norms - Kinship - Disproportionate exposure to similar people
• Exacerbated by residential segregation by residential segregation • Institutional/organizational arrangements - Social Influence Influence Th The largest component of the Framingham social network, 2000 th 2000 Yellow = obese, Green = not obese BMI BMI in a Network Context
- There is a close relationship between an individual’s BMI and the BMIs of their social network members • Having an obese personal contact increases the odds of becoming obese by 57% • Having a mutual relationship with an obese person increases the mutual relationship odds of becoming obese by 171% Yellow Yellow = obese, Green = not obese Yellow Yellow = obese, Green = not obese Yellow Yellow = obese, Green = not obese Yellow Yellow = obese, Green = not obese Yellow Yellow = obese, Green = not obese Yellow Yellow = obese, Green = not obese Social Social Influence
- The main mechanism driving BMI homophily is social influence social • One’s social network members provide a frame of reference for what is “normal” (i.e., whether obesity is acceptable depends on what one’s network members do/think) • Social network members shape each other’s behaviors (e.g., activity, choice of restaurants) • Social network members often serve as role models for each other Percent Percent Adopting at at a given time Time Hub Hub Bridges Diffusion Diffusion
- Diffusion: The processes by which a thing (e.g., an idea, innovation, disease) spreads through a social system - What determines when a person adopts an innovation?
• Interest in new technology in new technology • Wealth • Rational decision-making about perceived benefits decision• Exposure to the object through network channels - What determines how quickly an object spreads through a society? determines how quickly an object spreads through society?
- The presence of structural holes, hubs, and bridges - The extent of homophily ...
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- Spring '07
- Sociology, obese, Social Influence and Diffusion and Diffusion, Yellow Yellow, social network members