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Study Finds Extreme Left and Far Right More Alike than They Think

A study of 44 participants found that political extremists, regardless of ideology, show similar brain activity and heightened physiological arousal when viewing political content, supporting the horseshoe theory.

  • Researchers FeldmanHall and de Bruin found that extreme liberals and conservatives process political information in similar ways during a study involving 44 participants watching a political video.
  • The study utilized neuroimaging techniques alongside physiological monitoring and gaze tracking to investigate how deeply held convictions and emotional responses affect the way individuals perceive political information.
  • Results showed that extreme participants exhibited synchronized brain activity and physiological arousal during the video, especially in segments with extreme language, unlike moderates who showed varied responses.
  • FeldmanHall suggested that acknowledging common experiences may enhance understanding and lessen the tendency to view opposing political groups as less human, with the study’s results lending support to the horseshoe theory, which argues that political extremes share similarities more than they do with moderates.
  • These findings imply that despite opposing views, political extremists share neural responses that could promote understanding and suggest further research beyond U.S.-based political content is needed.
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Study finds extreme left and far right more alike than they think

Scientists say extreme liberals and far-right activists process political information similarly.

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Phys.org broke the news in United Kingdom on Thursday, August 28, 2025.
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