Egocentric bias
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Egocentric bias occurs when people claim more responsibility for themselves for the results of a joint action than an outside observer would.
Besides simply claiming credit for positive outcomes, which might simply be self-serving bias, people exhibiting egocentric bias also cite themselves as overly responsible for negative outcomes of group behavior as well.
This may be because our own actions are more "available" to us than the actions of others. See availability heuristic.
Micheal Ross and Fiore Sicoly first identified this cognitive bias.
See also: list of cognitive biases, attributional bias.
References
- Ross, M. & Sicoly, F. (1979). Egocentric biases in availability and attribution. Journal of Personality and Social Psychology 37, 322-336.