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Related Concept Videos

Group Polarization01:01

Group Polarization

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Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
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Information is everywhere and its presentation—such as how and when items are presented—can impact our perceptions and decisions surrounding the info. This broad concept umbrellas framing effects—influences that occur due to the way information is framed in its appearance, whether it’s purely the order or the specific wording of a message. Let’s take a look at numerous ways in which two versions of something can objectively say the same thing, yet we respond in...
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Humans are very diverse and although we share many similarities, we also have many differences. The social groups we belong to help form our identities (Tajfel, 1974). These differences may be difficult for some people to reconcile, which may lead to prejudice toward people who are different. Prejudice is a negative attitude and feeling toward an individual based solely on one’s membership in a particular social group (Allport, 1954; Brown, 2010). Prejudice is common against people who...
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People all belong to a gender, race, age, and social economic group. These groups provide a powerful source of our identity and self-esteem (Tajfel & Turner, 1979) and serve as our in-groups. An in-group is a group that we identify with or see ourselves as belonging to.
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Related Experiment Video

Updated: Aug 26, 2025

Continuous Theta Burst Stimulation of the Posterior Medial Frontal Cortex to Experimentally Reduce Ideological Threat Responses
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How digital media drive affective polarization through partisan sorting.

Petter Törnberg1,2

  • 1Amsterdam Institute for Social Science Research, University of Amsterdam, 1018 WV, Amsterdam, The Netherlands.

Proceedings of the National Academy of Sciences of the United States of America
|October 10, 2022
PubMed
Summary
This summary is machine-generated.

Digital media may drive political polarization not through echo chambers, but by connecting people outside their local networks. This interaction fosters partisan sorting, aligning conflicts and dividing the electorate into homogeneous groups.

Keywords:
agent-based modelingopinion dynamicspolarizationsocial cohesionsorting

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Area of Science:

  • Political Science
  • Sociology
  • Communication Studies

Background:

  • Recent decades show intense political polarization.
  • The echo chamber hypothesis is a dominant explanation for polarization.
  • Empirical evidence increasingly challenges the echo chamber hypothesis.

Purpose of the Study:

  • To reject the echo chamber hypothesis.
  • To propose an alternative causal mechanism for political polarization.
  • To model how digital media drives polarization through partisan sorting.

Main Methods:

  • Drawing on literature from affective polarization, digital media, and opinion dynamics.
  • Shifting the focus from diverging issue positions to partisan sorting.
  • Presenting a model where digital media encourage nonlocal interactions.

Main Results:

  • Digital media interactions outside local networks drive polarization.
  • Nonlocal interactions align conflicts along partisan lines, reducing heterogeneity.
  • Polarization occurs through partisan sorting, even with individual opinion convergence.

Conclusions:

  • Digital media polarize by fostering partisan sorting.
  • This process creates a societal division where identities and beliefs align with partisan groups.
  • The model offers a new understanding of digital media's role in contemporary political polarization.