Facts about Confirmation Bias
- 12
Radiologists examining identical chest X-rays diagnosed lung cancer 60% more frequently when primed with a cancer case history, showing confirmation bias shapes medical image interpretation.
- 11
Jurors in mock trials recalled 25% more details favoring the defendant they initially believed innocent, revealing confirmation bias shapes how evidence is mentally encoded during legal proceedings.
- 10
Confirmation bias reduces the effectiveness of fact-checking by 36 percent, as people often dismiss corrections that contradict their worldviews rather than integrating the corrected information.
- 09
Selective exposure to news sources reinforces confirmation bias, with 2016 Pew Research data showing 47% of conservative Americans primarily read right-leaning outlets versus 34% of liberals reading left-leaning outlets.
- 08
Patients with depression showed confirmation bias in memory recall, remembering 16% more negative information about themselves than positive information from identical feedback in a 2004 clinical psychology study.
- 07
Studies measuring hiring decisions show recruiters spent 40% more time reviewing resumes matching their preferred candidate profile, demonstrating confirmation bias in resume evaluation and selection processes.
- 06
A 2017 Stanford study found that presenting people with corrections to false beliefs about vaccines actually increased their misperceptions through backfire effects driven by confirmation bias.
- 05
In a 1979 study, researchers found that people rated evidence as more convincing when it supported their pre-existing political views, regardless of the evidence's actual quality or methodology.
- 04
Wikipedia editors in 2005 found that articles about controversial topics accumulated more citations to sources supporting the original article's viewpoint than opposing viewpoints, demonstrating confirmation bias in collaborative knowledge curation.
- 03
During the 2016 U.S. presidential election, studies found that voters exposed to fact-checks about candidates actually strengthened their original beliefs rather than changing them due to confirmation bias.
- 02
Brain imaging studies show that when people encounter information contradicting their beliefs, the amygdala activates more strongly than regions associated with logical reasoning.
- 01
Psychologist Leon Festinger's 1956 cognitive dissonance theory demonstrated that people actively seek information confirming existing beliefs while avoiding contradictory evidence.