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Suppressing the expression of negative emotions tends to undermine individuals’ and their partners’ wellbeing. However, sometimes expressive suppression may be relatively innocuous given that individuals commonly withhold negative emotions in order to maintain close relationships, and this may be especially the case when expressive suppression is enacted by people who exhibit amplified expressions of negative emotions, such as those high in attachment anxiety. The current research examined when and for whom expressive suppression may be more or less costly by testing whether the curvilinear effect of individuals’ expressive suppression on individuals’ and partners’ outcomes is moderated by individuals’ attachment anxiety. Our results across 3 dyadic studies revealed a linear effect of expressive suppression when predicting individuals’ outcomes: greater expressive suppression had costs for individuals (lower relationship satisfaction, reported responsiveness and discussion success, and greater discussion threat). Furthermore, in 4 of the 5 models, a moderated curvilinear effect of expressive suppression emerged when predicting partners’ outcomes. For individuals low in attachment anxiety, low levels of expressive suppression did not incur costs for their partners’ relationship satisfaction, perceptions of individuals’ responsiveness, discussion success, and discussion threat. Once expressive suppression surpassed moderate levels, however, greater expressive suppression had a detrimental effect on partners’ outcomes. In contrast, for individuals high in attachment anxiety, the negative effect of moderate-to-high levels of expressive suppression on partners’ outcomes was attenuated. These novel results demonstrate how considering curvilinear methods can uncover when and for whom expressive suppression may be more or less costly in intimate relationships. (PsycInfo Database Record (c) 2021 APA, all rights reserved)
