Recency bias is the tendency for people to weigh the most recent information or experience more heavily than earlier ones, sometimes even disproportionately. In UX, it means users’ judgments and memories of your product are often dominated by what happened last, not by the full journey.
Primacy bias describes how people tend to remember and be influenced more by the first items in a sequence than by those that come later. In UX, it shows up when users disproportionately notice, choose, or recall the first option presented to them, sometimes regardless of whether it’s the best.
Anchoring bias happens when people rely too heavily on the first piece of information they see, the “anchor”, when making decisions. In UX, it shows up when users’ perceptions, expectations, or actions are influenced by an initial number, label, or example, even if it’s arbitrary or irrelevant.
Confirmation bias is the tendency to favor information that confirms what we already believe, while ignoring or discounting evidence that challenges our assumptions. In UX, it shows up when teams interpret user feedback, analytics, or test results through the lens of their preconceived ideas, leading to poor decisions and missed opportunities.