Definition
Confirmation Bias is the pervasive tendency of the human mind to notice, accept, and remember information that supports an existing belief, while ignoring, distorting, or explaining away information that contradicts it. It is the “Sith Lord” of cognitive biases, operating unconsciously to create the illusion that one’s beliefs are objectively supported by evidence.
Why It Matters
It creates an ‘echo chamber’ in the mind that makes it nearly impossible to update one’s world-model even when it is demonstrably wrong.
Core Concepts
- Selective Thinking: Remembering the “hits” (confirmations) and forgetting the “misses” (contradictions).
- Subjective Validation: Using vague or open-ended criteria to interpret new information as support for a prior conclusion.
- The Toupee Fallacy: A specific form of selective thinking where a person believes they are an expert at detecting something (e.g., toupees, lies, plastic surgery) because they notice the obvious cases, but they are by definition unaware of the cases they miss.
- Narrative Curation: The brain uses existing paradigms as filters. Data that fits the story is “kept”; data that doesn’t is dismissed as an “exception” or rationalized away.
- Desirability Bias Link: We are even more susceptible to confirmation bias when the information supports something we want to be true.