Confirmation Bias

Confirmation bias is the most pervasive cognitive bias in human psychology: we actively seek out, interpret, and remember information that confirms our existing beliefs, while discounting contradictory evidence. A Pew Research study (2021) found that 85% of people primarily consume news from sources aligning with their political views, demonstrating its grip across society. Compared to #2's Dunning-Kruger Effect, which distorts self-assessment, this bias actively warps reality perception by filtering data through preexisting lenses. In business, it leads investors to ignore warning signs in favored companies. In medicine, doctors who form an early diagnosis unconsciously filter new patient data through that lens, risking misdiagnosis 15% more often than those who delay judgment. The cure isn't vague openness—it's actively seeking disconfirmation and appointing a dedicated devil's advocate to challenge assumptions.