Are you susceptible to extremism? Take this cognitive test. | Leor Zmigrod | TEDxNewEngland

Item: Are you susceptible to extremism? Take this cognitive test. | Leor Zmigrod | TEDxNewEngland
Rating: 4
Author: PostSingularity Institute

by Leor Zmigrod

Life & Natural Systems Psychology JMPsychology JMRCognition and cognitive psychology

🎙 Leor Zmigrod 👥 44.5M 📅 August 3, 2026 ⏱ 17 min 👁 9K 📄 science communication 🧭 2026-08-04

Available in: English (current) Français

Keywords

cognitive rigidityideologyextremismbrain plasticityempathy

Summary

In this TEDx talk, political neuroscientist Leor Zmigrod explores the psychological and neurobiological underpinnings of susceptibility to extremism. She argues that susceptibility lies on a spectrum, and that cognitive rigidity—a tendency to think in black-and-white terms and resist change—predicts ideological extremism across the political spectrum. She describes a card-sorting game used to measure unconscious rigidity, and presents research linking rigidity to dogmatism, rejection of evidence, and support for ideological violence. Zmigrod discusses neurochemical and structural correlates, such as dopamine’s role in learning and the amygdala’s involvement in threat processing, noting that right-wing beliefs have been associated with a larger amygdala, though the causality remains unclear. She also highlights a study showing that people who justify inequality exhibit reduced physiological arousal when witnessing suffering, suggesting ideologies can blunt empathy. Emphasizing brain plasticity, she argues that cognitive flexibility can be cultivated by questioning routines and fostering creativity. She concludes that resisting extremism begins with individual choice to maintain an open, adaptable mind.

160 words

Critical Evaluation

The talk provides a compelling and accessible overview of research on the psychological and neural bases of ideological extremism. Zmigrod’s central thesis—that cognitive rigidity is a transdiagnostic risk factor for adopting extreme ideologies—is supported by her own experimental work and aligns with a growing body of literature. The presentation is scientifically sound, with appropriate caveats about correlation versus causation, particularly regarding the amygdala findings. The speaker effectively communicates complex ideas without oversimplifying, and she avoids the common pitfall of demonizing individuals with rigid thinking, instead framing susceptibility as a spectrum influenced by both biology and environment. The inclusion of a specific study on inequality justification and empathy (referenced in the description) adds credibility, though the talk does not delve into methodological details. The main limitation is the brevity of the discussion on interventions; while she suggests questioning routines and fostering creativity, these are broad themes rather than concrete strategies. Additionally, the talk does not address potential cultural or contextual factors that might moderate the relationship between rigidity and extremism. Overall, the talk is a valuable contribution to public understanding of extremism, grounded in rigorous research, and it successfully bridges neuroscience and social issues.

193 words

Title / Content Match

The title accurately reflects the content: the talk presents a cognitive test and discusses susceptibility to extremism.

Quality & Reliability

8/10

The talk is based on the speaker's own peer-reviewed research and references a specific Nature article. The speaker is a recognized expert with credentials from Cambridge, Harvard, and Stanford. The content is presented with scientific nuance, acknowledging the chicken-and-egg problem and the plasticity of cognitive traits. However, some claims are simplified for a general audience, and the talk does not provide full methodological details.

Key Moments

Markers derived by PSI from the transcript: the creator did not define chapters.

Cited Sources

Inequality justification and empathy study — Referenced in the talk at 9:35 as evidence that people who justify inequality show reduced physiological empathy.
TEDx program — General information about TEDx events, mentioned in the description.

Concurring Sources

Nature Communications study on inequality justification and empathy — Directly cited in the talk, supporting the claim that ideology can affect physiological empathy.

Contribution & Novelties

The talk synthesizes research on cognitive rigidity and ideological extremism, offering a novel perspective that susceptibility is not binary but a spectrum, and that cognitive style predicts ideological adoption. It highlights the bidirectional relationship between brain and ideology, and emphasizes brain plasticity as a source of hope.

Pour aller plus loin :

Cognitive rigidity and its measurement — Provides background on cognitive flexibility and rigidity.
Amygdala and political orientation — A study linking amygdala volume to political orientation.
Dopamine and learning — Overview of dopamine’s role in reward and learning, relevant to the talk’s discussion.

95 words

Radar Profile

The radar profile shows high scores in quantity and quality of information, with a moderate technical level. The talk is scientifically robust but accessible, and the reliability is high due to the speaker's expertise and cited research.

Reliability 8/10