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Related Experiment Video

Updated: Sep 16, 2025

Continuous Theta Burst Stimulation of the Posterior Medial Frontal Cortex to Experimentally Reduce Ideological Threat Responses
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Bridging the gap between radical beliefs and violent behavior.

Perry A Callahan1, Barry Rosenfeld1

  • 1Department of Psychology, Fordham University.

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Strong ideological commitment does not reliably predict extremist violence. Radical beliefs are a poor proxy for violent intent, especially for far-right and far-left extremists, impacting law enforcement strategies.

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Area of Science:

  • Psychology of extremism
  • Political science
  • Criminology

Background:

  • Extremist violence is often linked to strong ideological commitment.
  • This assumption lacks explicit empirical testing.
  • Understanding predictors of radical behavior is crucial for security.

Purpose of the Study:

  • To examine the relationship between radical beliefs and radical behavior.
  • To test ideological commitment as a predictor of violence.
  • To investigate potential moderators of this relationship.

Main Methods:

  • Utilized a large (N=2,103) open-source dataset on extremism in the US.
  • Analyzed individuals from far-right, far-left, and jihadist-inspired groups.
  • Measured radical behaviors and criminal severity outcomes (civil disobedience, plot involvement, direct violence).

Main Results:

  • Ideological commitment correlated with radical behaviors and civil disobedience, but not violent plot involvement or direct violence.
  • Commitment predicted radical behaviors and violence in jihadist-inspired extremists, but not in far-right or far-left groups.
  • Hypothesized risk factors (mental illness, non-extremist crime, social ties) did not significantly moderate the relationship.

Conclusions:

  • Ideological commitment is not a strong predictor of violence for most extremists.
  • Radical beliefs may be an unreliable indicator of violent intent.
  • Findings have implications for extremism research and law enforcement practices.