Cognitive biases in perceptions of posttraumatic growth: A systematic review and meta-analysis

Posttraumatic growth (PTG) has captivated the attention of clinicians and researchers over the past three decades. However, accumulating evidence suggests that individuals' self-reports of PTG may be cognitively biased. In the current systematic review and meta-analysis, we aimed to investigate the relation between cognitive biases and perceived PTG. In line with existing theory on cognitive biases that may lead to illusory perceived PTG, we examined the following cognitive biases: defensiveness, memory bias, downward comparison bias, social desirability bias, positive attention bias, and growth beliefs. Forty-seven studies met criteria for inclusion in this review and 66 separate effects were coded for meta-analyses. Results indicated that cognitive biases were related to perceived PTG, with variation by type of cognitive bias. Moderator analyses revealed that downward comparison bias, positive attention bias, and growth beliefs exhibited stronger relations with perceived PTG than did defensiveness, memory bias, and social desirability bias. Further, subgroup analyses explored effects by type of cognitive bias and characteristics of cognitive bias measurements. The current study suggests that cognitive biases may have a role in individuals' perceptions of their PTG. This contributes to theory on the origins of illusory perceptions of PTG and provides direction for improvements to the measurement of PTG and clinical approaches to PTG.