Women with an avoidant attachment style show attenuated estradiol responses to emotionally intimate stimuli.

The current study examined neuroendocrine processes associated with emotional intimacy in humans. Despite the importance of this aspect of close relationships, emotional intimacy has received much less attention in neuroendocrine research compared to other aspects of close relationships. In this study, participants viewed movie clips depicting an emotionally intimate parent-child interaction or other, non-intimate themes, and we assessed whether depictions of emotional intimacy increased levels of estradiol, a steroid hormone associated with attachment and caregiving processes. We also examined whether estradiol responses were moderated by individual differences in attachment avoidance, or people's discomfort with closeness and intimacy. Our findings revealed that, among single participants, estradiol levels increased in response to the emotionally intimate clip, but this effect was not observed among currently partnered participants. Moreover, the effects of emotional intimacy were moderated by gender and attachment avoidance, such that highly avoidant women showed smaller increases in estradiol after watching the emotionally intimate clip. Women's avoidance was unrelated to estradiol responses in the non-intimate control conditions, however, suggesting that the effects of avoidance were specific to intimate contexts. Taken together, the current findings contribute to our understanding of the biological bases of attachment and caregiving processes. They also highlight the potential role of estradiol in avoidant individuals' regulation of closeness and intimacy.