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Close relationships have the potential to fundamentally alter relationship partners’ self-concepts and, consequently, can impact individuals’ mental health. One type of relationship-induced self-concept change is self-expansion, which describes the cognitive reorganization of the self that can occur when individuals include aspects of their partner into the self, or when they share novel and challenging activities together. In the current research, we hypothesized that greater self-expansion would be associated with fewer depression symptoms. In support of this hypothesis, across four studies using cross-sectional, dyadic, daily diary, and longitudinal methodologies, we found that self-expansion was negatively associated with depression symptoms. This association was robust and remained a significant predictor of depression symptoms when controlling for demographic factors (gender, age, relationship length; Studies 1–4) and known risk factors of depression (dysfunctional attitudes, major life stressors, self-concept clarity; Study 2). Moreover, individuals’ self-expansion negatively predicted depression symptoms at the daily level (Study 3) and longitudinally over 9 months (Study 4). These results are the first to show the link between self-expansion and depression symptoms, suggesting that self-expansion may have robust benefits for individuals, beyond improving relationship dynamics.

Individuals hold implicit beliefs about the nature of romantic relationships. Growth beliefs are characterized by thoughts that romantic relationships can be cultivated over time, whereas destiny beliefs are characterized by thoughts that relationships are either meant to be or not. In the current research, we propose that individuals who hold strong growth beliefs (but not destiny beliefs) should be more likely to experience self-expansion, as these individuals are oriented toward relationship cultivation. In turn, this increase in self-expansion should promote greater relationship quality and maintenance. Across three studies (two cross-sectional and one longitudinal) that sampled from varying populations and relationship types, we found evidence that self-expansion mediates the association between growth beliefs (but not destiny beliefs) and satisfaction, commitment, accommodation, and dissolution consideration. These data provide insights into the mechanisms by which implicit theories influence relationship functioning and establish implicit theories as an individual-level antecedent to the self-expansion experience.

Studies have established that grown children’s problems affect parental well-being, but a dearth of research has addressed daily interactions and biological systems that may underlie these associations. This study examined whether parents have different types of daily interactions with adult children who have problems and whether those interactions are associated with variations in parents’ diurnal cortisol rhythms. Middle-aged parents (n = 197) reported their interactions with adult children for seven consecutive days and provided saliva, analyzed for cortisol, three times a day (wake, 30 minutes after wake, bedtime) for four of those days. Parents were more likely to report negative encounters but not less likely to report positive interactions or contact with adult children who suffered from problems. Interactions with adult children who had physical-emotional problems had more immediate same day associations with cortisol whereas interactions with adult children who had lifestyle-behavioral problems had more delayed, or next day associations with cortisol. Daily interactions and their associations with the hypothalamic-pituitary-adrenal-axis may be important mechanisms by which adult children with problems negatively affect parental well-being.

Romantic love has received significant theoretical and empirical attention from the perspectives of evolutionary psychology and traditional social psychology. Although their respective advancements on love have often occurred in isolation, there exists great overlap between the ideas presented by each discipline. In this chapter, we discuss this overlap and the likely benefits derived by bridging these disciplines more concertedly. We first discuss social psychological approaches to the study of love. We then shift focus to evolutionary psychological approaches, which build on social psychological research by emphasizing possible functions for the existence and experience of love. We conclude by suggesting other topics of relationship functioning that have been much investigated by traditional psychological approaches but have not been explored systematically through the lens of evolutionary psychology. It is our belief that there is significant value in exposing mainstream evolutionary psychologists to relevant research in the relationship science domain more generally and vice versa. It is this type of cross-talk that will be most advantageous for spurring mutually beneficial collaborations that will likely provide the greatest advances in our understanding of romantic love. Keywords: love; romantic relationships; pair bonding; commitment

Individuals convicted of committing domestic violence are often court mandated to attend a Batterer Intervention Program (BIP). Evidence of the effectiveness of these programs, however, is inconclusive largely because of the diversity in approaches used by BIPs. In a pre-test/post-test design, the current study assessed outcomes associated with one specific BIP: a counseling-based, non-punitive psychoeducational program designed to treat both male and female domestic violence offenders. A sample of 149 clients completed a comprehensive survey both prior to and upon completion of the BIP. Participation in this BIP fostered attitudes known to be associated with nonviolence, including perceptions of accountability, anger management, indications of safety planning, and reported desire for change. Additionally, self-reported levels of psychological and physical violence decreased from pre- to post-treatment. Theoretical and therapeutic implications for BIPs are discussed.

In this review we argue that relatively recent evolutionary adaptations that are relational or psychological in nature might refocus, dampen, or otherwise shape hormonal processes related to evolutionarily “older” behaviors. We focus on the steroid hormones testosterone and estradiol and discuss a) their associations with “older relational processes” such as mate competition, dominance and nurturance, and b) the ways in which “newer relational processes” such as commitment and attachment relate to these hormones in the context of intimate relationships. We propose that these new relational processes might influence hormones in a manner that enables short-term mating relationships to be transformed into long-term romantic pair-bonds that may be unique to humans.

We examined the interplay between husbands’ and wives’ positive and negative nonsexual interpersonal behaviors, frequency of sexual intercourse, sexual satisfaction, and feelings of marital satisfaction. To do this, we conducted an in-depth face-to-face interview and completed a series of telephone diaries with 105 couples during their second, third, and fourteenth years of marriage. Consistent with the argument that women’s sexual response is tied to intimacy (Basson, 2000), multilevel analyses revealed that husbands’ positive interpersonal behaviors directed toward their wives—but not wives’ positivity nor spouses’ negative behaviors (regardless of gender)— predicted the frequency with which couples engaged in intercourse. The frequency of sexual intercourse and interpersonal negativity predicted both husbands’ and wives’ sexual satisfaction ; wives’ positive behaviors were also tied to husbands’ sexual satisfaction. When spouses’ interpersonal behaviors, frequency of sexual intercourse, and sexual satisfaction were considered in tandem, all but the frequency of sexual intercourse were associated with marital satisfaction. When it comes to feelings of marital satisfaction, therefore, a satisfying sex life and a warm interpersonal climate appear to matter more than does a greater frequency of sexual intercourse. Collectively, these findings shed much-needed light on the interplay between the nonsexual interpersonal climate of marriage and spouses’ sexual relationships.