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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

The purpose of this paper is to extend to the field of relationship science, recent discussions and suggested changes in open research practises. We demonstrate different ways that greater transparency of the research process in our field will accelerate scientific progress by increasing accuracy of reported research findings. Importantly, we make concrete recommendations for how relationship researchers can transition to greater disclosure of research practices in a manner that is sensitive to the unique design features of methodologies employed by relationship scientists. We discuss how to implement these recommendations for four different research designs regularly used in relationship research and practical limitations regarding implementing our recommendations and provide potential solutions to these problems.

We assessed the impact of thinking of a current romantic partner on acute blood glucose responses and positive affect over a short period of time. Participants in romantic relationships were randomly assigned to reflect on their partner, an opposite-sex friend, or their morning routine. Blood glucose levels were assessed prior to reflection, as well as at 10 and 25 min postreflection. Results revealed that individuals in the routine and friend conditions exhibited a decline in glucose over time, whereas individuals in the partner condition did not exhibit this decline (rather, a slight increase) in glucose over time. Reported positive affect following reflection was positively associated with increases in glucose, but only for individuals who reflected on their partner, suggesting this physiological response reflects eustress. These findings add to the literature on eustress in relationships and have implications for relationship processes.

The identification of relationship-relevant individual differences is central to elucidating how relationship experiences differentially impact individuals' health. To this end, we highlight the utility of studying the influence of individual differences on physiological outcomes (e.g., cortisol reactivity and recovery) in the context of normative relationship transitions. We argue that relationship transitions, such as falling in love and the process of committing to marry one's partner, amplify the influence of individual differences on relationship processes and, by extension, on physiological outcomes. Two such individual differences are highlighted-namely, relationship-focused processing and dependence-and suggestions for future work are provided.

We summarize the large body of research conducted over the previous 30 years on the link between interpersonal conflict and physiological outcomes, with a focus on implications for health. Specifically, we review evidence that conflict in close, romantic relationships affects internal bodily processes, including cardiovascular, endocrine, and immune function, as well as objective health indicators. We focus on studies that have utilized standardized, laboratory-based conflict discussions, as we believe this methodology provides the clearest picture of how conflict affects health. It is our hope that this general overview serves as a useful introduction to the state of the field.

This special issue on “mind–body connections in personal relationships” brings together 8 empirical contributions by researchers from a wide range of disciplinary backgrounds. The objectives for this issue were threefold: (a) to highlight research being conducted by close relationships researchers, (b) to foster disciplinary cross-pollination, and (c) to emphasize the interdisciplinary nature of the research in this domain. The quality of the submissions received for this special issue ensured that all of these objectives were met. The primary goal for this introduction to the special issue was to briefly outline how close relationships scholars are in prime position to contribute to a holistic understanding of the mechanisms underlying the reciprocal association between close relationships and physical/physiological functioning.

Nonmarital couples' salivary cortisol responses during a likelihood of marriage discussion were assessed. Sixty-eight couple members (34 couples) in the United States independently indicated the extent to which they had experience thinking about and talking about marriage to their current partners (i.e., marriage novelty). Couples subsequently jointly graphed their chance of marriage to each other over the course of their relationship histories. Increased levels of marriage novelty predicted heightened cortisol reactivity to the joint discussion relative to cortisol responses of couple members for whom the idea of marriage was less novel. These results highlight the impact simply discussing transitions can have on individuals' physiological responses, and add to the expanding literature concerning the link between nonmarital romances and biological outcomes.

In this study, a prototype analysis of romantic missing was conducted. College-age participants in the United States generated features of missing a partner (Study 1) and rated their centrality (Study 2). In a reaction time task, participants made category judgments for central features more quickly than for noncentral features (Study 3). In recognition and recall tasks, central features were more salient in participants’ memory, and participants evaluated individuals experiencing central features in vignettes as missing their partners more (Study 4). A prototypebased measure of missing administered to individuals in long-distance relationships (Study 5) correlated with commitment and attachment dimensions but only weakly with loneliness. Finally, level of missing differed based on whether individuals were in a geographically distant (vs. proximal) relationships (Study 6).

Two recent studies (C. R. Agnew, T. J. Loving, & S. M. Drigotas, 2001; T. K. MacDonald & M. Ross, 1999) investigated the relative ability of outsiders’ (network members) and daters’ perceptions of the daters’ romance to predict relationship fate. Careful analysis of these studies suggests that the types of network members asked and what is asked significantly impact the prognostic ability of outsiders’ perceptions. The current research replicates and extends this literature and highlights the challenges posed when collecting outsiders’ perspectives of their friends’ relationships. Daters and 2 friends (1 female, 1 male) were asked to provide their perceptions of the dating relationship on 2 indexes: a direct prediction of the likelihood that the relationship would last 6 months and an overall qualitative assessment of the dater’s commitment. Results highlight the need for researchers to carefully attend to the instruments and samples employed when obtaining multiple perspectives of the same dating relationship.

We investigated the impact of relative marital power on 72 newlywed couples’ endocrinological responses to marital conflict. Marital power was determined by comparing spouses’ reports of dependent love for one another. Less powerful spouses displayed elevated adrenocorticotropic hormone (ACTH) responses to a conflict discussion. Shared power appeared to have a beneficial effect on wives’ but not husbands’ ACTH responses. Spouses’ cortisol levels declined over time, except for wives who were less powerful and for husbands who shared power with their wives. Conflict behaviors did not differ as a function of this marital power index. These data suggest that relative levels of general emotional power in relationships may play an important role in spouses’ physiological responses to marital conflict.