This article is part of a series that draws lessons from some of the research collected in Aaron Dalton’s “Empirical Research for Editors” list .
“Fluency” refers to how easy or difficult it is to do or process something. I interpret the science in this area through the lens of plain language, since its goal is to maximize fluency. Plain language writing is something the audience can ideally understand the first time they read it. The science in this area explains why this is a good strategy.
In the article “Preference Fluency in Choice ,” the authors find that when even minor factors make it harder to form a preference, the reader is more likely to defer a decision or choose a compromise. For example, using a difficult-to-read font made it more likely that the reader would postpone their decision.
In the article “If It’s Difficult to Pronounce, It Must Be Risky: Fluency, Familiarity, and Risk Perception ,” authors build on the understanding that the more familiar something is, the less risky we believe it to be. Using difficult-to-pronounce words fosters the impression that something is unfamiliar, and so we assess it as riskier. For example, ostensible food additives were rated as more harmful when their names were difficult to pronounce than when their names were easy to pronounce.
In the article “Effects of Perceptual Fluency on Affective Judgments ,” the authors studied the ways in which perceptual fluency (the subjective feeling that something is easy to understand) affects judgment. Increased perceptual fluency leads to “increased judgments of prettiness and liking and decreased judgments of ugliness and disliking of stimuli.”
Similarly, a study out of MIT and Microsoft, “The Aesthetics of Reading ,” observed that high-quality typography improved the mood of study participants, who then performed better in assessments than those who had to read poor-quality typography.
In the article “Easy on the Mind, Easy on the Wrongdoer: Discrepantly Fluent Violations Are Deemed Less Morally Wrong ,” the authors looked at how fluency affected judgments of moral violations. If the moral violation was made more difficult to read, the reader rated the violation as more wrong, and vice versa.
You may have heard of Daniel Kahneman’s book Thinking, Fast and Slow where he talks about two modes of thought: the fast, instinctive and emotional mode, and the slower, more deliberate mode. The article “Overcoming intuition: Metacognitive difficulty activates analytic reasoning ” observes that if something is difficult to process (disfluent), it serves as an alarm that activates analytic forms of reasoning.
The wonderfully named article “Consequences of Erudite Vernacular Utilized Irrespective of Necessity: Problems with Using Long Words Needlessly ” attempts to debunk the theory shared by many undergraduates that increasing the complexity of their vocabulary gives the impression that they’re more intelligent. Over five experiments, the author showed the opposite to be true.
Most importantly, several articles looked at the effect of fluency on impressions of truth. In short, the more fluent and easier to understand something is, the more likely it is that the reader will perceive it to be true.