New research suggests that individuals who identify as politically conservative are more likely than their liberal counterparts to find “slippery slope” arguments logically sound. This tendency appears to stem from a greater reliance on intuitive thinking styles rather than deliberate processing. The findings were published in the Personality and Social Psychology Bulletin.
Slippery slope arguments are a staple of rhetoric in law, ethics, and politics. These arguments suggest that a minor, seemingly harmless initial action will trigger a chain reaction leading to a catastrophic final outcome.
A classic example is the idea that eating one cookie will lead to eating ten, which will eventually result in significant weight gain. Despite the prevalence of this argumentative structure, psychological research has historically lacked a clear understanding of who finds these arguments persuasive.
“The most immediate motivation for this research was an observation that, despite being relatively common in everyday discussions and well-researched in philosophy and law, there is simply not much psychological research on slippery slope thinking and arguments,” explained study author Rajen A. Anderson, an assistant professor at Leeds University Business School.
“We thus started with some relatively basic questions: Why do people engage in this kind of thinking and are certain people more likely to agree with these kinds of arguments? We then focused on political ideology for two reasons: Politics is rife with slippery slope arguments, and existing psychological theories would suggest multiple possibilities for how political ideology relates to slippery slope thinking.”
Some theoretical models suggested that political extremists on both sides would favor these arguments due to cognitive rigidity and a preference for simplistic causal explanations. Other theories pointed toward liberals, citing their tendency to expand concept definitions to include a wider range of harms. A third perspective posited that conservatives might be most susceptible due to a general preference for intuition and a psychological aversion to uncertainty or change.
To investigate these competing hypotheses, the researchers conducted 15 separate studies involving diverse methodologies. The project included survey data, experimental manipulations, and natural language processing of social media content. The total sample size across these investigations included thousands of participants. The researchers recruited subjects from the United States, the Netherlands, Finland, and Chile to test whether the findings would generalize across different cultures and languages.
In the initial set of studies, the research team presented participants with a series of non-political slippery slope arguments. These vignettes described everyday scenarios, such as a person showing up late to work or breaking a diet. For instance, one scenario suggested that if a person skips washing dishes today, they will eventually stop cleaning their house entirely. Participants rated how logical they perceived these arguments to be. They also reported their political ideology on a scale ranging from liberal to conservative.
The results from these initial surveys revealed a consistent pattern. Individuals who identified as more conservative rated the slippery slope arguments as significantly more logical than those who identified as liberal. This association remained statistically significant even when the researchers controlled for demographic factors such as age and gender. The pattern held true in the international samples as well, indicating that the link between conservatism and slippery slope thinking is not unique to the political climate of the United States.
To assess how these cognitive tendencies manifest in real-world communication, the researchers analyzed over 57,000 comments from political subreddits. They collected data from communities dedicated to both Democratic and Republican viewpoints. The team utilized ChatGPT to code the comments for the presence of slippery slope reasoning.
This analysis showed that comments posted in conservative communities were more likely to exhibit slippery slope structures than those in liberal communities. Additionally, comments that utilized this style of argumentation tended to receive more approval, in the form of “upvotes,” from other users.
The researchers then sought to understand the psychological mechanism driving this effect. They hypothesized that the difference was rooted in how individuals process information. Conservative ideology has been linked in past research to “intuitive” thinking, which involves relying on gut feelings and immediate responses. Liberal ideology has been associated with “deliberative” thinking, which involves slower, more analytical processing.
To test this mechanism, the researchers measured participants’ tendencies toward intuitive versus deliberative thought. They found that intuitive thinking statistically mediated the relationship between conservatism and the endorsement of slippery slope arguments. This means that conservatives were more likely to accept these arguments largely because they were more likely to process the information intuitively.
In a subsequent experiment, the researchers manipulated how participants processed the arguments. They assigned one group of participants to a “deliberation” condition. In this condition, participants were instructed to think carefully about their answers. They were also forced to wait ten seconds before they could rate the logic of the argument. The control group received no such instructions and faced no time delay.
The data from this experiment provided evidence for the intuition hypothesis. When conservative participants were prompted to think deliberately and forced to slow down, their endorsement of slippery slope arguments decreased significantly. In fact, the gap between conservative and liberal ratings narrowed substantially in the deliberation condition. This suggests that the ideological difference is not necessarily a fixed trait but is influenced by the mode of thinking a person employs at the moment.
Another study investigated whether the structure of the argument itself mattered. The researchers presented some participants with a full slippery slope argument, including the intermediate steps between the initial action and the final disaster. Other participants viewed a “skipped step” version, where the initial action led immediately to the disaster without explanation.
The results showed that conservatives only rated the arguments as more logical when the intermediate steps were present. This indicates that the intuitive appeal of the argument relies on the plausibility of the causal chain.
Finally, the researchers examined the potential social consequences of this cognitive style. They asked participants about their support for punitive criminal justice policies, such as “three strikes” laws or mandatory minimum sentences.
The analysis revealed that slippery slope thinking was a significant predictor of support for harsher sentencing. Individuals who believed that small negative actions lead to larger disasters were more likely to support severe punishment for offenders. This helps explain, in part, why conservatives often favor stricter criminal justice measures.
“Slippery slope thinking describes a particular kind of prediction: If a minor negative event occurs, do I think that worse events will follow? Our findings suggest that being more politically conservative is associated with engaging in more slippery slope thinking, based on a greater reliance on intuition: Slippery slope arguments are often intuitively appealing, and this intuitive appeal brings people in,” Anderson told PsyPost.
“If we change this reliance on intuition (e.g., encouraging people to think deliberately about the argument), then there’s less of an effect of politics. This political difference in slippery slope thinking has consequences for the kinds of arguments that people use on social media, and in how much they support harsher criminal sentencing policies.”
Most of the arguments used in the surveys were non-political in nature. This was a deliberate design choice to measure underlying cognitive styles without the interference of partisan bias regarding specific issues.
“We wanted to measure baseline tendencies to engage in slippery slope thinking in general, setting aside potential bias just from participants agreeing with the political message of an argument,” Anderson explained. “What this means is that, all else being equal, our results suggest that being more politically conservative corresponds to more slippery slope thinking.”
“What this does not mean is that conservatives will always endorse every slippery slope argument more than liberals will: It is very easy to create an argument that liberals will endorse more than conservatives, because the argument supports a conclusion that liberals will agree with.”
Future research could explore how these cognitive tendencies interact with specific political issues. Researchers might also examine whether interventions designed to reduce reliance on intuition could alter support for specific policies rooted in slippery slope logic.
The current work provides a baseline for understanding how differing cognitive styles contribute to political disagreements. It suggests that political polarization is not merely a disagreement over facts but also a divergence in how groups intuitively predict the consequences of human behavior.
“One potential misinterpretation is that readers may think that slippery slope thinking is illogical or irrational (since that’s often how slippery slope thinking is talked about), and thus we are saying that conservatives are more illogical or irrational than liberals,” Anderson added. “To be direct, we are not saying that.”
“How logical or illogical a slippery slope argument is depends on the specific steps of the argument: If A happens, what’s the probability that B will follow? If B happens, what’s the probability that C will follow? etc. If the probabilities are high, then slippery slope thinking is more “logical”; If the probabilities are low, then slippery slope thinking is less “logical”. In fact, there is some research to suggest that dishonest behavior sometimes does look like a slippery slope.”
The study, “‘And the Next Thing You Know . . .’: Ideological Differences in Slippery Slope Thinking,” was authored by Rajen A. Anderson, Daan Scheepers, and Benjamin C. Ruisch.