Know thyself: misperceptions of actual performance undermine achievement motivation, future performance, and subjective well-being.

@article{Kim2010KnowTM,
  title={Know thyself: misperceptions of actual performance undermine achievement motivation, future performance, and subjective well-being.},
  author={Young-Hoon Kim and Chi-yue Chiu and Zhimin Zou},
  journal={Journal of personality and social psychology},
  year={2010},
  volume={99 3},
  pages={
          395-409
        }
}
Contrary to the popular assumption that self-enhancement improves task motivation and future performance, the authors propose that both inflated and deflated self-assessments of performance are linked to an increased likelihood of practicing self-handicapping and having relatively poor performance in future tasks. Consistent with this proposal, we found that irrespective of the level of actual performance, compared with accurate self-assessment, both inflated and deflated self-assessments of… 

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