Researchers from the University of Colorado Boulder and Carnegie Mellon University argue that this "illusion of courage" is one example of an "empathy gap", that is, our inability to imagine how we will behave in future emotional situations.
According to the empathy gap theory, when the moment of truth is far off one isn't feeling, and therefore is out of touch with, the fear they are likely to experience when push comes to shove.
The research team also included Cornell University's David Dunning and former CMU graduate student Ned Welch, currently a consultant for McKinsey.
In a series of three experiments, the researchers found that people overestimate their willingness to engage in psychologically distant embarrassing public performances, and also found that they could reduce this illusion of courage by inducing immediate emotions that effectively put them in touch with the fear they would experience.
In the first two experiments, college students were asked if they would be willing to engage in a future embarrassing situation, telling a funny story to their class in one study, and dancing to James Brown's 'Sex Machine' in front of the class in the other, in exchange for a few dollars.
Students were either asked outright or after being exposed to short films that aroused mild experiences of fear and anger. Students who did not view movie clips significantly overestimated their willingness to sing or dance.
When they experienced negative emotions like fear and anger as a result of watching the movie clips, students were much more accurate in predicting their own future lack of interest in performing.
"Because social anxiety associated with the prospect of facing an embarrassing situation is such a common and powerful emotion in everyday life, we might think that we know ourselves well enough to predict our own behaviour in such situations," Leaf Van Boven, associate professor of psychology and neuroscience at the University of Colorado Boulder, said.
"But the ample experience most of us should have gained with predicting our own future behaviour isn't sufficient to overcome the empathy gap - our inability to anticipate the impact of emotional states we aren't currently experiencing," Boven said.
The illusion of courage is even said too have as practical consequences.
"People frequently face potential embarrassing situations in everyday life, and the illusion of courage is likely to cause us to expose ourselves to risks that, when the moment of truth arrives, we wish we hadn't taken," George Loewenstein, the Herbert A. Simon University Professor of Economics and Psychology within CMU's Dietrich College of Humanities and Social Sciences, said.
"Knowing that, we might choose to be more cautious, or we might use the illusion of courage to help us take risks we think are worth it, knowing full well that we are likely to regret the decision when the moment of truth arrives," he added.
The study has been published in the Journal of Behavioral Decision Making.