Belief perseverance, also sometimes referred to as conceptual conservatism, describes the phenomenon where individuals maintain a belief even when confronted with new information that firmly contradicts it. This concept suggests that human beings can act irrationally at times, as rationality typically involves a degree of conceptual flexibility. The philosopher F.C.S. Schiller considered belief perseverance to be so fundamental that he believed it "deserves
to rank among the fundamental 'laws' of nature." This psychological tendency highlights the human inclination to cling to established ideas, even in the face of disconfirming evidence.
The initial exploration into belief perseverance was conducted by Festinger, Riecken, and Schachter. These psychiatrists immersed themselves in a doomsday cult whose members were convinced the world would end on December 21, 1954. Despite the prophecy's failure, the majority of these believers continued to hold onto their faith. This observation formed the basis for Festinger's later works, including "When Prophecy Fails: A Social and Psychological Study of a Modern Group That Predicted the Destruction of the World" (1956) and "A Theory of Cognitive Dissonance" (1957). In these works, Festinger proposed that people strive for internal psychological consistency to function mentally in the real world. When internal inconsistency arises, it creates psychological discomfort, motivating individuals to reduce this cognitive dissonance, often by justifying their existing beliefs.
Early Insights from Doomsday Cults
The study by Festinger, Riecken, and Schachter provided a foundational understanding of belief perseverance. Their direct observation of a doomsday cult offered a compelling real-world example of individuals maintaining their beliefs despite undeniable contradictory evidence. The cult members' unwavering faith, even after the predicted apocalypse did not occur, illustrated the powerful psychological mechanisms at play when deeply held convictions are challenged. This seminal study underscored the idea that beliefs are not always easily discarded, even when proven false by events.
This research led to the development of the theory of cognitive dissonance, a key concept in social psychology. Cognitive dissonance describes the mental discomfort experienced by a person who simultaneously holds two or more contradictory beliefs, ideas, or values. The theory suggests that people are motivated to reduce this dissonance, and one way to do so is by altering their beliefs, attitudes, or behaviors, or by reinterpreting the information to make it consistent with their existing views. In the case of the doomsday cult, the failure of the prophecy created significant dissonance, which many members resolved by finding new justifications for their continued belief, rather than abandoning it entirely.
The Role of Confirmation Bias
Confirmation bias, also known as myside bias, is a related cognitive bias that significantly contributes to belief perseverance. It involves the tendency to search for, interpret, and remember information in a way that confirms one's existing preconceptions or working hypotheses. This bias is a systematic error in inductive reasoning, where individuals selectively gather or recall information, or interpret it in a biased manner. The effect of confirmation bias is particularly strong for emotionally charged issues and for beliefs that are deeply entrenched within an individual's worldview.
People exhibiting confirmation bias often interpret ambiguous evidence as supporting their current position. This biased search, interpretation, and memory can lead to phenomena like attitude polarization, where disagreements become more extreme even when different parties are exposed to the same evidence. Confirmation biases contribute to overconfidence in personal beliefs and can maintain or strengthen these beliefs even when faced with contrary evidence. This can result in poor decision-making, observed in various contexts, including political and organizational settings, further illustrating the pervasive nature of belief perseverance.
