Are Conservatives & Liberals Wired Differently?
please note:
A colleague, Tom Cleave, notified me that some of the studies referenced in this blog post have failed to replicate in more recent research and yet other interesting studies were published since I first posted this some time ago. The update on the studies referenced and a description of the new research is included at the bottom of this post. I’ve kept both to share how science works and how it evolves.
Have you ever listened to someone whose political views differ sharply from your own and felt stunned, wondering how they could possibly believe what they’re saying? Even when looking at exactly the same information, people often interpret it in radically different ways. This has puzzled me for a long time and I’ve tried to find answers in the scientific literature.
We all like to think our political beliefs are shaped purely by reason, personal experiences, and deeply-held values. But have you ever considered that biological and psychological differences might also play a role? Over the years, I’ve come across research suggesting that these kinds of influences could factor into our political views. Intrigued, I decided to take a deeper dive to explore this fascinating topic further, especially given the extent of political polarization we’re witnessing at the moment.
It turns out that over the past two decades researchers have uncovered striking neurological, genetic, physiological, and psychological differences between people who lean conservative compared with those who lean liberal. While our environments shape our views, science suggests that how we process information in our world—how we handle uncertainty, respond to threats, and weigh moral choices in particular—may be influenced by the way we’re built.
Brain Structure and Political Orientation
Brain imaging research by Kanai et al. (2011) found evidence of structural differences between conservatives and liberals. The research found that conservatives typically have a larger and more active amygdala, a region responsible for processing fear and threats, which could possibly explain their strong emphasis on security, law enforcement, and national defense. Liberals, on the other hand, were found to have a larger anterior cingulate cortex, a brain region involved in managing uncertainty and adapting to change, which could explain their greater openness to new ideas and social change.
The Genetics of Political Beliefs
Genetics also appears to play a role. Twin studies suggest that about 30-60% of political ideology may be inherited (Hatemi & McDermott, 2012). For example, individuals with a specific variant of the dopamine receptor D4 (DRD4) gene, related to dopamine regulation and novelty-seeking behavior, are more likely to identify as liberal and this was particularly true if they've had diverse social experiences. So clearly, genetics sets the stage, but environment appears to influence the expression in behavior.
Physiological Responses to Threat
Beyond brain structure and genetics, conservatives and liberals also appear to differ in how their bodies react to the world.
An interesting 2008 study by Oxley et al. found that conservatives exhibited stronger physiological responses to sudden loud noises and disturbing images. Their heightened sensitivity to threat correlates with a preference for policies that emphasize stability and protection.
Moral Foundations and Political Differences
Jonathan Haidt’s Moral Foundations Theory proposes that political beliefs are deeply intertwined with fundamental moral instincts. Research examining this theory (Haidt & Graham, 2007; Graham, Haidt, & Nosek, 2009) found that while everyone values core moral foundations to some degree, liberals typically emphasize care/harm and fairness/reciprocity the most, aligning closely with social justice. Conservatives, in contrast, tend to give weight to a set of foundations including not only care and fairness but also loyalty, authority, and sanctity—values closely associated with patriotism, tradition, and religious beliefs. These differences, influenced by biology and experience, help explain why political disagreements often feel more like profound moral divides rather than mere policy disagreements.
affective polarization and cognitive biases
Recent research has expanded these insights considerably. Dannagal Young and colleagues (2024) highlight how "epistemological identity"—our sense of belonging to groups based on shared ways of understanding truth—drives political polarization. This concept of expressive epistemology suggests people adopt beliefs aligned with their group's values, further entrenching divisions. Druckman and Levy (2021) emphasize that affective polarization, the growing emotional hostility between opposing political groups, profoundly impacts how facts are interpreted, causing individuals to dismiss or distort information that challenges their group's identity or values.
Studies exploring biases toward specific groups provide additional insights. Jones et al. (2018) found that ideological predispositions significantly influence public attitudes toward transgender individuals, with conservatives often less supportive due to underlying psychological factors like traditionalism and discomfort with ambiguity. Stern et al. (2013) revealed ideological differences even in subconscious processes, showing conservatives rely more heavily on traditional gender cues when categorizing sexual orientation, highlighting deep-rooted cognitive differences tied to ideological beliefs.
Research on cognitive style also underscores these divisions. Ostrofsky and Shobe (2015) discovered that individuals with a higher "need for cognitive closure"—a desire for certainty and aversion to ambiguity—tend to prefer realism in art, hinting that this psychological trait may similarly affect political orientation, with conservatives often exhibiting a greater need for certainty and clear structure. Cacioppo and Petty’s classic work (1982) on the "need for cognition"—an individual’s enjoyment of thinking and problem-solving—suggests liberals may enjoy more complex, nuanced analyses, whereas conservatives might prefer clear, straightforward solutions.
What This Means
It’s important to point out that none of this suggests that political beliefs are biologically predetermined. Clearly, your upbringing, the people you associate with, the news sources you rely on all make some contribution too. In fact, the direction of causality could even be reversed. However created, it is clear that biology influences the processing of information so differently. If our brains, genes, and bodies influence to a certain degree how we see the world, recognizing these differences can foster better dialogue and understanding.
Next time you’re in a political debate, consider that the other person might not just think differently—they might actually be wired differently. Keeping this in mind can help you communicate more effectively by framing your arguments and understanding their perspective through the insights offered by the fascinating research summarized in this post. Approaching discussions with empathy and awareness of these underlying differences can lead to more meaningful and productive exchanges.
An Update: Which of the Above Has Held Up?
Since I first published this post, a colleague helpfully pointed out that political neuroscience has undergone a significant stress test in recently, and several of the studies I cited deserve a closer look.
The Oxley et al. (2008) finding on physiological threat responses has not held up: a large preregistered, multi-site replication by Bakker et al. (2020) in Nature Human Behaviour found no evidence that conservatives react more strongly than liberals to threatening stimuli. The Kanai et al. (2011) brain structure findings have replicated only partly. A much larger preregistered replication by Petropoulos Petalas et al. (2024) in iScience confirmed a small association between amygdala volume and conservatism — but the effect was roughly three times weaker than originally reported, about the size of a sesame seed, and the anterior cingulate cortex finding did not replicate at all. The specific DRD4 liberal gene finding has similarly not held up in larger samples, though general heritability estimates from twin studies remain reasonably intact. The Moral Foundations work and Cacioppo and Petty's need for cognition have held up better as psychological frameworks.
To summarize, the claim on the basis of the previous research that conservatives and liberals are biologically different is weaker than the initial research reported.
Where the Research Has Moved: From Structure to Process
However, the more interesting shift, though, isn't just that older findings have weakened. It's that the field has largely moved away from asking do conservatives and liberals have different brains? and toward a more productive question: how do people with different political identities process the same information differently? This reframing turns out to be more robust empirically and more useful practically.
The landmark study here is Leong, Chen, Willer, and Zaki (2020), published in PNAS. The researchers scanned participants while they watched real political videos including news clips, campaign ads, and speeches about immigration policy and looked for regions where brain activity diverged between conservatives and liberals. Interestingly, the auditory and visual cortices responded almost identically across the political spectrum. Essentially at the level of raw sensory input, everyone was seeing and hearing the same thing. The divergence appeared in one specific higher-order region, the dorsomedial prefrontal cortex (DMPFC), a part of the brain that helps us interpret narratives, track other people's intentions, and fit new information into a coherent story. Participants who shared political attitudes with one another showed similar DMPFC activity patterns. People who had opposing attitudes showed divergent ones. And the polarization wasn't constant, it spiked exactly during moments when the videos used moral, emotional, or risk-related language (words like "threat," "security," "dangerous," "compassion"). Even more fascinating, participants whose DMPFC activity more closely resembled the "average conservative" or "average liberal" pattern were more likely to shift their stated attitudes in that direction after watching.
The implication is profound. Two people can watch the same political ad and, at the level of their eyes and ears, receive nearly identical inputs, but by the time that content reaches the brain regions responsible for interpretation and meaning, they're constructing genuinely different stories about what just happened. This is the brain's normal interpretive machinery running on different inputs, namely, the accumulated framings, emotional associations, and group loyalties each person brings to the content. And it's happening fastest and most strongly in response to exactly the kind of moral-emotional, threat-laden language that dominates political media and social media feeds.
A more recent longitudinal study by Boiman, Ohad, Zvi, Katabi, and Yeshurun (2026), published in Communications Psychology, extends this picture in an important direction. The researchers scanned 21 participants twice, about two and a half years apart, during a period of significant political upheaval in Israel, and had them watch the same political videos in both sessions. The biggest neural changes appeared in the amygdala, hippocampus, and caudate which are regions associated with emotion, memory, and reward and those changes tracked shifts in participants' political in-group alliances. So, as people's political identities shifted, so did the way their brains responded to identical political content. The authors characterize this as evidence that social and psychological processes shape neural responses to political content, rather than the other way around.
Taken together, these findings tell a different story than the one I told originally. Rather than conservatives and liberals being born with different wiring which then predetermines their politics, the emerging view is that shared identities, social networks, and media diets shape how our brains interpret the world, and that these patterns are plastic, shifting as our affiliations shift. The practical implication actually reinforces the point of my original post, though for slightly different reasons. If polarization lives largely at the level of interpretation and making meaning, and if moral, emotional, and threat-based language is what drives the divergence most, then how we talk to each other matters enormously. And the recognition that the person across the table isn't wired against you, they're interpreting the same information through a different set of accumulated meanings, might be exactly the opening that productive empathic conversation requires.
references
Given that this blog post relies so heavily on research findings, I’ve decided to include references to the sources that it is based on.
Kanai, R., Feilden, T., Firth, C., & Rees, G. (2011). Political orientations are correlated with brain structure in young adults. Current Biology, 21(8), 677-680.
Oxley, D. R., Smith, K. B., Alford, J. R., Hibbing, M. V., Miller, J. L., Scalora, M., … & Hibbing, J. R. (2008). Political attitudes vary with physiological traits. Science, 321(5896), 1667-1670.
Hatemi, P. K., & McDermott, R. (2012). The genetics of politics: discovery, challenges, and progress. Trends in Genetics, 28(10), 525-533.
Haidt, J., & Graham, J. (2007). When morality opposes justice: Conservatives have moral intuitions that liberals may not recognize. Social Justice Research, 20(1), 98-116.
Graham, J., Haidt, J., & Nosek, B. A. (2009). Liberals and conservatives rely on different sets of moral foundations. Journal of Personality and Social Psychology, 96(5), 1029-1046.
Young, D. G., Molokach, B., & Oittinen, E. M. (2024). Lay epistemology and the populist’s playbook: The roles of epistemological identity and expressive epistemology. Current Opinion in Psychology.
Druckman, J. N., & Levy, J. (2021). Affective polarization in the American public. Northwestern Institute for Policy Research.
Jones, P. E., Brewer, P. R., Young, D. G., Lambe, J. L., & Hoffman, L. H. (2018). Explaining public opinion toward transgender people, rights, and candidates. Public Opinion Quarterly, 82(2), 252-278.
Stern, C., West, T. V., Jost, J. T., & Rule, N. O. (2013). The politics of gaydar: Ideological differences in the use of gendered cues in categorizing sexual orientation. Journal of Personality and Social Psychology, 104(3), 520-541.
Ostrofsky, J., & Shobe, E. R. (2015). The relationship between need for cognitive closure and the appreciation, understanding, and viewing times of realistic and nonrealistic figurative paintings. Empirical Studies of the Arts, 33(1), 106-113.
Cacioppo, J. T., & Petty, R. E. (1982). The need for cognition. Journal of Personality and Social Psychology, 42(1), 116-131.
additional references
These are the references for the new additional section that I added.
Bakker, B. N., Schumacher, G., Gothreau, C., & Arceneaux, K. (2020). Conservatives and liberals have similar physiological responses to threats. Nature Human Behaviour, 4(6), 613–621.
Boiman, G., Ohad, T., Zvi, Y., Katabi, N., & Yeshurun, Y. (2026). Changes in political attitudes are associated with changes in neural responses to political content. Communications Psychology.
Leong, Y. C., Chen, J., Willer, R., & Zaki, J. (2020). Conservative and liberal attitudes drive polarized neural responses to political content. Proceedings of the National Academy of Sciences, 117(44), 27731–27739.
Petropoulos Petalas, D., Schumacher, G., & Scholte, S. H. (2024). Is political ideology correlated with brain structure? A preregistered replication. iScience, 27(10), 110532.
Settle, J. E., Dawes, C. T., Christakis, N. A., & Fowler, J. H. (2010). Friendships moderate an association between a dopamine gene variant and political ideology. The Journal of Politics, 72(4), 1189–1198.
