Relationship science - Wikipedia Relationship science From Wikipedia, the free encyclopedia   (Redirected from Relationship Science) Jump to navigation Jump to search Relationship science is an interdisciplinary field dedicated to the scientific study of interpersonal relationship processes.[1] Due to its interdisciplinary nature, relationship science is made-up of researchers of various professional backgrounds within psychology (e.g., clinical, social, and developmental psychologists) and outside of psychology (e.g., anthropologists, sociologists, economists, and biologists), but most researchers who identify with the field are psychologists by training.[2] Additionally, the field's emphasis has historically been close and intimate relationships, which includes predominantly dating & married couples, parent-child relationships, and friendships & social networks, but some also study less salient social relationships such as colleagues and acquaintances.[3] Contents 1 History 1.1 Early 20th century 1.2 1960s to 2000s 1.3 2000s 2 Types of relationships studied 2.1 Personal relationships 2.2 Close relationships 2.3 Intimate relationships 3 Theories 3.1 Social exchange theory 3.2 Social learning theory 3.3 Attachment theory 3.4 Evolutionary theories 3.5 Social ecological theories 4 Methodologies 4.1 Self-report data 4.2 Experimental data 4.3 Observational data 4.4 Longitudinal data 4.5 Interdependent and dyadic data 4.5.1 Common fate model 4.5.2 Mutual influence (dyadic feedback) model 4.5.3 Dyadic score model 4.5.4 Actor-partner interdependence model (APIM) 5 Peer-reviewed journals 5.1 Personal Relationships 5.2 Journal of Marriage and Family (JMF) 5.3 Journal of Family Psychology (JFP) 5.4 Journal of Social and Personal Relationships (JSPR) 6 Conferences and professional organizations 6.1 International Association for Relationship Research (IARR) 6.2 Relationship Researchers Interest Group (RRIG) 6.2.1 Close Relationships Pre-Conference at the SPSP Conference 6.3 National Council on Family Relations (NCFR) 6.4 Couples Special Interest Group 7 See also 8 References History[edit] Early 20th century[edit] Empirically studying interpersonal relationships and social connection traces back to the early 20th century when some of the earliest focuses were on family relationships from a sociological perspective—specifically, marriage and parenting.[4] In fact, in 1938 the National Council on Family Relations (NCFR) was formed[5] and, in 1939, what is now the Journal of Marriage and Family (JMF) was established to publish peer-reviewed research with this emphasis.[6] In the 30s, 40s, and 50s, researchers such as John Bowlby, Harry Harlow, Robert Hinde, and Mary Ainsworth began pursuing the study of mother-infant attachment.[7] In 1949, Reuben Hill developed the ABC-X model, which is a theoretical framework used to examine how families manage and adapt to crises given the resources they have.[8] Then, in the late 50s and early 60s, the purview of relationship research began to expand more, beyond the idea of just family research. In 1959, Stanley Schachter published the book The Psychology of Affiliation: Experimental Studies of the Sources of Gregariousness, where he discussed human's general affiliative needs and how they are intensified by biological responses (e.g, anxiety and hunger).[9] That same year, Harold (Hal) Kelley and John Thibaut published a book, The Social Psychology of Groups, that outlined interdependence theory—an interdisciplinary theory that would become an essential framework for understanding close relationships from a cost-benefit perspective in the years to come.[10] However, this prior interest in relationships was infrequent, and it was not until the late 60s and early 70s that the study of relationships truly began to blossom and gain popularity, which was in large part due to the influence of Ellen Berscheid and Elaine Hatfield.[11] 1960s to 2000s[edit] Roughly two decades after the aforementioned work of Hill and a decade after the works of Schachter, Kelley, and Thibaut, Ellen Berscheid and Elaine Hatfield (professors at the Universities of Minnesota and Wisconsin, respectively) began studying how two individuals become attracted to one another.[12][13][14] Yet, their work went beyond just attraction and began to explore other domains such as the processes of choosing a romantic partner and falling in love, and the centrality of relationships in human health and well-being.[11] However, being a female professor and researcher during this era (when academia was overwhelmingly dominated by white males) was incredibly difficult, and was only made more difficult by the public reception to their phenomena of interest.[11] In 1974, their work came under fire after the senator of Wisconsin at the time alleged their research was a waste of taxpayer dollars, in light of Berscheid receiving $84,000 from the National Science Foundation to study love.[11] Despite this immense scrutiny, they nevertheless persisted in pioneering the nascent field of relationship science through the 70s and into the 80s through seminal developments such as the distinction between passionate and companionate love and a scale to measure the former.[11][15][16] Meanwhile, researchers from across different disciplines had begun to dedicate themselves to the study of relationships. Along with the fast growing interest came high-impact works. Urie Bronfenbrenner's late 70s and mid-80s social-ecological model established key principles that researchers would eventually use ubiquitously to study the impact of socio-contextual factors on relationships.[17][18][19][20] Graham Spanier published the Dyadic Adjustment Scale (DAS) in JMF, which is currently the most widely cited scale of intimate relationship quality.[21] John Bowlby's attachment theory, formalized in the late 60s and early 70s, laid the groundwork for the study of parent-child relationships and also helped shape the study of adult relationships in the field.[22][23][24] Notably, in 1983, Harold Kelley, Ellen Berscheid, Andrew Christensen, Anne Peplau and their colleagues wrote the book Close Relationships, which provided a comprehensive overview of the field of relationship science in its early stages, and identified the typologies of relationships studied.[25] Also in the 80s and into the 90s, Toni Antonucci began exploring friendships and social support among adults,[26] while Arthur Aron was examining the role of relationships with romantic partners, siblings, friends, and parents in individual self-expansion.[27] Additionally, Thomas Malloy and David Kenny developed the social relations model (an early analytic approach to understanding the roles of a person and their partner in their interactions)[28] and Kenny later published his work on Models of Non-independence in Dyadic Research in 1996.[29] With a growing interest in marriage and family therapy in relationship science, in the late 80s and 90s, researchers such as Howard Markman, Frank Floyd, and Scott Stanley began developing romantic relationship (with a primary focus on marriages) interventions;[30] specifically, in 1995, Floyd and colleagues published the program they developed called "Prevention Intervention and Relationship Enhancement" (PREP).[31] Although there were many theoretical and empirical contributions of the 1970s and 80s, the professional evolution of relationship science was simultaneously taking place. The first international conference specifically dedicated to relationship processes took place in 1977 in Swansea, Wales, hosted by Mark Cook (a social psychologists) and Glen Wilson (a psychotherapist).[32] In 1982, the first of the eventually bi-annual International Conference of Personal Relationships (ICPR) took place in Madison, Wisconsin under the direction of Robin Gilmour and Steve Duck, and with about 100 attendees.[32][33] Two years later, in 1984, the International Society for the Study of Personal Relationships (ISSPR) was borne out of the ICPR and the Journal of Social and Personal Relationships, the first peer-reviewed journal unique to the field of relationship science, was established.[34] Then in 1987, the Iowa Network of Personal Relationships (which would later be known as the International Network of Personal Relationships; INPR) was formed and Hal Kelley was elected president of ISSPR that same year.[33][34][32] A few years later in 1991, Ellen Berscheid (the then president of ISSPR) announced a merger of ISSPR and INPR, which ultimately fell through until the idea was reignited over a decade later.[34] In 1994, the journal Personal Relationships was formally established by ISSPR and began publishing work in relationship science with Pat Noller as the editor.[34] Only a year later, Nancy Collins took over editing Personal Relationships and Anne Peplau became president of ISSPR.[34] The changing of roles only persisted when Dan Perlman became president of ISSPR in 1996 and began discussing with the president of INPR (at the time, Barbara Sarason) how they might work to better integrate the efforts and goals of the two organizations; in 1998, Jeffry Simpson took over as editor of Personal Relationships.[34] The decades-long, interdisciplinary study of relationships culminated in Ellen Berscheid's 1999 article The Greening of Relationship Science.[35] Here, Berscheid took the opportunity to close out the 20th-century with an overview of the field's past, present, and future. She described the uniqueness and benefits of a well-integrated interdisciplinary field and the advancements that have cemented the field as an "essential science" (Berscheid, 1999, p. 262).[11][35] However, she also discussed the shortcomings that were stifling the progress of the field, and provided specific advice for overcoming such limitations in the upcoming century.[35] Some of this advice included leaving behind traditional analytic approaches that fail to consider non-independence of individuals in relationships, and prioritizing the implementation of existing methods that consider interdependent and dyadic data as well as "creatively constructing new ones" (Berscheid, 1999, p. 261).[29][35] Additionally, she stressed the dire need of the field to inform public opinion and policy related specifically to intimate relationship stability (e.g., quality, dissolution/divorce) -- at the time, a hotly debated topic informed by partisan politics rather than empirical evidence, and for scientists to place greater emphasis on the environments in which relationships operate.[35] Her article foreshadowed and influenced the evolution of the field in the 21st-century, and its structure has since been adapted by other relationship researchers to reflect on how far the field has come and where it is going.[36][37] 2000s[edit] The year 2000 included new developments in the field such as Nancy Collins and Brooke Feeney's work on partner support-seeking and caregiving in romantic relationships from an attachment theory perspective,[38] and Reis, Sheldon, Gable, and colleagues' article Daily Well-being: The Role of Autonomy, Competence, & Relatedness.[39] A couple of years later, Rena Repetti, Shelley Taylor, and Teresa Seaman published work that addressed some of Berscheid's 1999 article concerns as well as used health psychology perspectives to inform relationship science.[40] They empirically demonstrated the negative effects of family home environments with significant conflict and aggression on the mental and physical health of individuals in both childhood and adulthood.[40] Simultaneously, the early 21st-century was a time for major changes in the professional development of the field. In 2004, after previously unsuccessful attempts, ISSPR and INPR merged to form the International Association for Relationship Research (IARR).[41] In 2007, Harry Reis published Steps Toward the Ripening of Relationship Science, an article, inspired by Ellen Berscheid's 1999 article, that recapped and made suggestions for furthering the field.[36] He discussed important works that could be used as framework for guiding the field, including Thomas Bradbury's 2002 article, Research on Relationships as a Prelude to Action—an article focussed on the mechanisms for improvement of relationship research including better integration of research findings, more ethnically and culturally diverse sampling, and interdisciplinary, problem-centered approaches to research.[42] Reis argued the need for integrating and organizing theories, for paying more attention to non-romantic relationships (the primary focus of the area) in research and intervention development, and the use of his theory of perceived partner responsiveness to enable this progress.[36] Fast-forwarding to 2012, relationship researchers again heeded Berscheid's advice of using relationships science to inform real-world issues. Eli Finkel, Paul Eastwick, Benjamin Karney, Harry Reis, and Susan Sprecher wrote an article discussing the impact of online dating on relationship formation and both its positive and negative implications for relationship outcomes compared to traditional offline dating.[43] Additionally, in 2018, Emily Impett and Amy Muise published their follow-up to Berscheid's article, The Sexing of Relationship Science: Impetus for the Special Issue on Sex and Relationships.[37] Here, they called on the field to draw more attention to and place greater weight on the role of sexual satisfaction; they identified this area of research as nascent but fertile territory to explore sexuality in relationships and establish it as an integral part of relationship science.[37] Types of relationships studied[edit] The field recognizes that, for two individuals to be in the most basic form of a social relationship, they must be interdependent—that is, have interconnected behaviors and mutual influence on one another.[20][25][44] Personal relationships[edit] A relationship is said to be personal when there is not only interdependence (the defining feature of all relationships), but when two people recognize each other as unique and unable to be replaced.[20] Personal relationships can include colleagues, acquaintances, family members, and others, so long as the criteria for the relationship are met.[20] Close relationships[edit] The definition of close relationships that is frequently referred back to is one from Harold Kelley and colleague's 1983 book, Close Relationships.[25][45] This asserts that a close relationship is "one of strong, frequent, and diverse interdependence that lasts over a considerable period of time" (Kelley et al., 1983, p. 38).[25] This definition indicates that not even all personal relationships may be considered close relationships.[3][20][25] Close relationships can include family relationships (e.g., parent-child, siblings, grandparent-grandchild, in-laws, etc.) and friendships.[3][20] Intimate relationships[edit] What defines a relationship as intimate are the same features that comprise a close relationship (i.e., must be personal, must have bidirectional interdependence, and must be close), but there must also be a shared sexual passion or the potential to be sexually intimate.[20] Intimate relationships can include married couples, dating partners, and other relationships that satisfy the aforementioned criteria.[20][46] Theories[edit] Social exchange theory[edit] Social exchange theory was developed in the late 50s and early 60s as an economic approach to describing social experiences.[47][48] It addresses the transactional nature of relationships whereby people determine how to proceed in a relationship after assessing the costs versus the benefits.[47] A prominent subset that secured the place of social exchange theory in relationship science is interdependence theory, which was articulated in 1959 by Harold Kelley and John Thibaut in The Social Psychology of Groups.[2][10] Even though Kelley and Thibaut's intent was to discuss this theory as it applied to groups, they began by exploring the effects of mutual influence as it pertains to two people together (i.e., a dyad).[10][20] They expanded upon this process at the dyadic level in later years, further developing the idea that people in relationships 1) compare the overall positive to overall negative outcomes of their relationship (i.e., OUTCOME = REWARDS - COSTS), which they then 2) compare to what they expect to get or think they should be getting out of the relationship (i.e., comparison level or "CL") to determine how satisfied they are (i.e., SATISFACTION = OUTCOME - CL), and finally 3) compare the outcome of their relationship to the possible options of being either in another relationship or not in any relationship at all (i.e., comparison level for alternatives or "CLalt") to determine how dependent they are on the relationship/their partner (i.e., DEPENDENCE = OUTCOME - CLalt).[10][20][49] They described this as having practical and important implications for commitment in a relationship such that those less satisfied by and less dependent on their partner may be more inclined to end the relationship (e.g., divorce, in the context of a marriage).[10][20] Interdependence theory has also been the basis of other influential works, such as Caryl Rusbult's investment model theory.[2][50][51] The investment model (later known as the 'investment model of commitment processes')[52] directly adopts the principles of interdependence theory and extends it by asserting that the magnitude of an individual's investment of resources in the relationship increases the costs of leaving the relationship, which decreases the value of alternatives, and therefore increases commitment to the relationship.[50] Social learning theory[edit] Social learning theory can be traced back to the 1940s and originated from the ideas of behaviorists like Clark L. Hull and B.F. Skinner.[53][54] However, it was notably articulated by Albert Bandura in his 1971 book, Social Learning Theory.[55] It is closely related to social exchange theory (and the subsequently developed interdependence theory), but focuses more on drawbacks and rewards found directly in behavior and interactions (e.g., distant vs. displays affection) opposed to broad costs and benefits.[20] In the context of close and intimate relationships, it emphasizes that partners' behaviors (e.g., displays of empathy during a conversation) are central in that they not only invoke an immediate response, but teach one another what to believe and how to feel about their relationship (e.g., feeling secure and trusting), which affects how satisfied one is—a process that is described as cyclical.[20] Social learning theory as it applies to relationship science led to the development of other prominent theories such as Gerald Patterson's coercion theory, outlined in his book, Coercive Family Process.[20][56] Coercion theory focuses on why people end up in and stay in unhealthy relationships by explaining that individuals unintentionally reinforce each other's bad behaviors.[20][56] This pattern is also described as cyclical where partners will continue to behave in a certain, negative way (e.g., nagging) when their partner reinforces said behavior (e.g., does what partner is requesting through nagging), which tells them that their negative behavior is effective at getting the outcome they desired.[20][56] Attachment theory[edit] Attachment theory was formalized in a trilogy of books, Attachment and Loss, published in 1969, 1973, and 1980 by John Bowlby.[22][23][24] The theory was originally developed to pertain to parent-child relationships, and more specifically during infancy.[2][22] This idea that children rely on a primary caregiver—an attachment figure—to feel safe and confident to explore the world (a secure base) and come back to being loved, accepted, and supported (a safe haven) has been applied extensively to adult relationships.[1][2][20] This was first applied by Cindy Hazan and Phillip Shaver in 1987, specifically in the context of romantic relationships.[57] Their research found that not only were attachment styles (i.e., secure, avoidant, anxious/ambivalent) relatively stable from infancy and into adulthood, but that these three major styles predicted the ways in which adults experienced romantic relationships.[57] This spawned nearly three-and-a-half decades of research exploring the importance of attachment processes in childhood (i.e., parent-child relationships) and their predictive value in adult relationship formation and maintenance (i.e., romantic partnerships, friendships).[1][2][20] Influential people who have studied close and intimate relationships from an attachment perspective include Nancy Collins, Jeffry Simpson, and Chris Fraley. Nancy Collins and Stephen Read (1990) developed one of the most widely-cited and used scales assessing adult attachment styles and, additionally, their dimensions.[58] Their work found three dimensions and investigated the extent to which they applied to individual self-esteem, trust, etc. as well as gender differences in their relevance to relationship quality in dating couples.[58] Jeffry Simpson has conducted extensive research on the influence of attachment styles on relationships, including documenting more negative and less positive emotions expressed in a relationship by individuals who were either anxious or avoidant.[59][60] Chris Fraley's work on attachment includes a prominent study that used item-response theory (IRT) to explore the psychometric properties of self-report adult attachment scales.[61] His findings indicated very low levels of desirable psychometric properties in three out of four of the most commonly used adult attachment scales.[61] Among improvements to existing scales, he made suggestions for the future development of adult attachment scales, including more discriminating items in the secure region and additional items to tap into the low ends of anxiety and avoidance dimensions.[61] Evolutionary theories[edit] Evolutionary psychology as it pertains to relationship science is a collection of theories that aim to understand mating behaviors as a product of our ancestral past and adaptation.[1][20] This set of perspectives has a common thread that links the modern-day study of relationship processes and behaviors to adaptive responses and features that were developed to maximize reproductive fitness.[20] Sexual selection says that success in competition for mates happens for those who possess traits that are more attractive to potential mating partners.[62] Researchers have also considered the theory of parental investment, where females (compared to males) have more to lose and ancestrally were therefore more selective in mate selection; this is one facet of many observed sex differences in mate selection where male and females seek and prefer certain traits.[20] These theoretical perspectives have been implemented widely in the study of relationships both on their own and in an integrated approach (e.g., considering cultural context).[1][20] Prominent works that have taken the evolutionary approach to studying relationship formation and processes include a review of existing research by Steven Gangstead and Martie Haselton (2015) that revealed differences in both women's sexual desires and men's reactions to women across the ovulation cycle.[63] David Buss has extensively studied sex differences in cross-cultural mate selection, jealousy, and other relationship processes through research that integrates evolutionary perspectives with socio-cultural contexts (e.g., Sex differences in human mate preferences: Evolutionary hypotheses tested in 37 cultures; Sex differences in jealousy: Evolution, physiology, and psychology, etc.).[64][65] Additionally, Jeffry Simpson and Steven Gangstead have published widely cited work on relationship processes from an evolutionary lens, including research on human mating that discusses trade-offs (faced by females selecting a mate) between a potential mate's genetic fitness for having children and their willingness to help in child-rearing.[66] Figure 1. ABC-X Model (Adapted from McCubbin & Patterson, 1983)[67] Figure 2. Bronfenbrenner's Social Ecological Model (Adapted from Bradbury & Karney, 2019)[68] Social ecological theories[edit] Social ecology—derived from sociology and anthropology—approaches the study of people in a way that considers the environment or context in which people live.[20] Social ecological models, as they pertain to relationships, explain relationship processes from a lens that consider external forces acting upon people in a relationship, whether they be family members, romantic partners, or friends.[20][35] Reuben Hill articulated one of the earliest documented social ecological models pertaining to relationship science—specifically families—in 1949.[8] This is known as the ABC-X model or crisis theory.[8] The 'A' in the model indicates a stressor; the 'B' indicates resources available to handle the stressor (both tangible and emotional); the 'C' indicates the interpretation of the stressor (whether it is perceived as a threat or manageable obstacle); finally, the 'X' indicates the crisis (the overall experience and response to the stressor that either strengthens or weakens families/couples).[8][20][69] See Figure 1. In 1977, 1979, and 1986, Urie Bronfenbrenner published a model that integrated the multiple different levels or domains of an individuals environment.[17][18][70] It was first developed to apply to child development, but has been widely applied in relationship science.[2][20] The first level is the microsystem, which contains the single, immediate context people or dyads (e.g., couple, parent-child, friends) directly find themselves in—such as a home, school, or work.[17][71] The second level is the mesosystem, which considers the combined effects of two or more contexts/settings.[17][71] The third level is the exosystem, which also considers the effects of two or more contexts, but specifically contains at least one context that the individual or dyad is not directly in (e.g., government, social services) but affects an environment they are directly in (e.g., home, work).[17][71] The fourth level is the macrosystem, which is the broader cultural and social attitudes that affect an individual.[17] Finally, the chronosystem is the broadest level that is specifically the dimension of time as it relates to an individuals' context changes and life events.[17][71] See Figure 2. Figure 3. Vulnerability-Stress-Adaptation (VSA) Model (Adapted from Karney and Bradbury, 1995)[72] Researchers in relationship science have used social ecological models to study changes and stressors in relationships over time, and how couples, families, or even friends manage them given the contexts they evolve in.[2][20] Application of social ecological models in relationship research have been seen in influential works such as Benjamin Karney and Thomas Bradbury's Vulnerability-Stress-Adaptation (VSA) model.[73] The VSA model is a theoretical approach that enables researchers to study the impact of stressful events on relationship quality and stability over time (e.g., determine risk of divorce/relationship dissolution), given a couple's capacity to manage and adapt to such events.[2][35][73] See Figure 3. Methodologies[edit] Relationship science has relied on a variety of methods for both data collection and analysis.[2][11][44] This includes but is not limited to: cross-sectional data, longitudinal data, self-report study, observational study, experimental study, repeated measures design, and mixed-methods procedures.[11][20][72][74][75][45] Self-report data[edit] Relationship science relies predominantly on individuals' self-reported evaluations and descriptions of their own relationship processes.[20][75][45] This method of data collection often comes in the form of answering a questionnaire that requires either selection from a set of fixed responses or providing open-ended responses.[20] It is often the simplest way to study relationships, but researchers have cautioned against solely relying on this form of measurement.[75][45] Some issues that arise with the use of self-report data is the difficulty of accurately answering retrospective questions or questions that require introspection.[75][45] Recently, particularly in light of the anti-false positive movement in psychology, relationship scientists are encouraging the use of multiple methods (e.g., self-report data, observational data) to study the same or similar constructs in different ways.[75][44] However, an identified benefit of using specifically self-report questionnaires is that many of the measures used to study relationships are standardized and are therefore used in multiple different studies, where findings across studies can provide insight into replicability.[75] Experimental data[edit] Some of the earliest studies conducted in relationship science were done using laboratory experiments.[11] The field has since used experimental methods in order to infer causality about a relationship phenomenon of interest.[11][20] This requires identification of a dependent variable that will be the measured effect (e.g., performance on a stressful task) and an independent variable that will be what is manipulated (e.g., social support vs. no social support).[20] However, a common concern with experimental study of relationship phenomena is the potential lack of generalizability of laboratory setting findings to real-world contexts.[20] Observational data[edit] Observational (or, behavioral) data in relationship science is a method of making inferences about relationship processes that relies on an observer's reports, rather than a participant's own reports of their relationship.[11][20] This is often done through videotaping or audio recording participants' interactions with one another and having outside observers systematically identify (i.e., code) aspects of interest dependent upon the type of relationship being studied (e.g., patience exhibited during a parent-child activity; affection exhibited during a romantic couple's discussion).[11][20] This method enables researchers to study aspects of a relationship that may be sub-conscious to participants or would otherwise not be detectable through self-report measures.[4] However, a hurdle of observational research is establishing strong inter-rater reliability—that is, the level of agreement between observers who are coding the observations.[4][20] Additionally, as participants often know they are being watched or recorded and such interactions often take place in laboratory settings, observational data collection presents the issue of reactivity—when individuals change their natural response or behavior because they are being watched.[4][20][76] Longitudinal data[edit] A cornerstone of the research done in relationship science is the use of multi-wave assessments and subsequent repeated measures design, multi-level modeling (MLM), and structural equation modeling (SEM).[36][72][75][76] As relationships themselves are longitudinal, this approach enables researchers to assess change across time within and/or between relationships.[36][72][76] However, it must be noted that most of the longitudinal research in relationship science focuses on marriages and some on parent-child relationships, while relatively few longitudinal studies on friendships or other types of relationships exist.[36] Within longitudinal research, there is additional variation in the length of time of the study; while some studies follow individuals, couples, parents and children, etc. over the course of a few years, some study change processes across the lifespan and in multiple different relationships (e.g., from infancy into adulthood).[36][72][75] Additionally, the frequency of and intervals of time between multi-wave assessments has considerable variation in longitudinal research; one might employ intensive longitudinal methods that require daily assessments, methods that require monthly assessments, or methods that require annual or bi-annual assessments.[36][72] Figure 4. Common Fate Model (Adapted from Kenny, 1996 and Iida, Seidman, & Shrout, 2018)[77][78] Interdependent and dyadic data[edit] An important turning point in the analytic approach to studying relationships came at the advent of statistically modeling interdependence and dyadic processes—that is, studying two individuals (or even two groups of individuals) simultaneously to account for the overlap in or interdependence of relationship processes.[35][36] In 2006, David Kenny, Deborah Kashy, and William Cook published the book Dyadic Data Analysis, which has been widely cited as a tool of understanding and measuring non-independence.[74] This book includes information and instructions on using MLM, SEM, and other statistical methods to study both between and within dyad phenomena.[74] Several models have been articulated for these purposes in both journal articles and the 2006 Kenny, Kashy, & Cook text, including 1) the common fate model, 2) the mutual influence (or dyadic feedback) model, 3) the dyadic score model, and the most commonly used 4) actor-partner interdependence model (APIM).[74][79][80] Figure 5. Mutual Influence Model (Adapted from Kenny, 1996)[77] Common fate model[edit] The common fate model is a method of estimating not how two people influence one another, but how two people are similarly influenced by an external force.[79][80] Dyadic means are computed for both the independent and dependent variable to estimate the effects of the dyad as a single unit.[79][80] The between-dyad correlations are adjusted by the within-dyad correlations in order to remove individual-level variation.[79][80] The two partners' predictor and outcome variables are observed variables that are used to compute latent variables (i.e., the 'common fate variables').[79][80] See Figure 4. Figure 6. Dyadic Score Model (Adapted from Iida, Seidman, & Shrout, 2018)[78] Mutual influence (dyadic feedback) model[edit] The mutual influence or dyadic feedback model is a method of considering reciprocal influence of partners' predictor(s) on one another's and partners' outcome on one another's.[79] Compared to the APIM, this model assumes there are no partner effects and no other types of non-independence, as seen in the predictor-predictor and outcome-outcome paths.[79] Additionally, it assumes equal effects of partner's influence on one another (i.e., 1 influences 2 equally as 2 influences 1).[79] See Figure 5. Dyadic score model[edit] Figure 7. Actor-partner Interdependence Model (Adapted from Kenny, 1996 and Iida, Seidman, & Shrout, 2018)[77][78] The dyadic score model uses two partners observed predictor and outcome variables to compute both dyadic 'level' and 'difference' latent variables.[80] The level variables are similar to the common fate latent variables while the difference variables represent the within-dyad contrast.[80] See Figure 6. Actor-partner interdependence model (APIM)[edit] The APIM is a method of accounting for dyadic interdependence via both actor and partner effects.[74][79][80] Specifically, it considers the influence of one partner's predictor(s) on the other partner's predictor(s) and outcome.[74][79][80] This is modeled using regression, MLM, or SEM procedures.[79] See Figure 7. Peer-reviewed journals[edit] Personal Relationships[edit] Personal Relationships is an interdisciplinary journal that publishes research on personal relationship processes from various different lenses (e.g., psychological, anthropological, sociological, etc.).[81] It is an IARR journal that traces back to 1994. The incoming editor is Ashley K. Randall.[81] Journal of Marriage and Family (JMF)[edit] JMF is a journal that publishes research with an emphasis on family relationships, which includes marital and parenting processes, from a broad, social science lens.[6] It is an NCFR journal that traces back to 1939.[6] It was previously named Living (1939-1940) and Marriage and Family Living (1941-1963) before becoming the Journal of Marriage and Family.[82] The current editor is Kristi Williams.[6] Journal of Family Psychology (JFP)[edit] JFP is a journal that publishes research with an emphasis on family relationships, which includes marital and parenting processes, from specifically a psychology lens.[83] It is an American Psychological Association (APA) journal that traces back to 1987.[83] The current editor is Barbara H. Fiese.[83] Journal of Social and Personal Relationships (JSPR)[edit] JSPR is an interdisciplinary journal that broadly publishes research social and personal relationship processes.[84] It is an IARR affiliated journal that traces back to 1984.[85] The current editor is Melissa Curran.[84] Conferences and professional organizations[edit] International Association for Relationship Research (IARR)[edit] IARR is a professional organization that was established in 2004 dedicated to the study of interpersonal relationships.[86][41] It was formed out of the merger between the International Society for the Study of Personal Relationships (ISSPR) and the International Network of Personal Relationships (INPR).[86] Every two years, the organization hosts a main conference and, every year, hosts workshops and specialty conferences.[41] They present several awards, including but not limited to article, book, teaching, mentoring, dissertation, and early-career awards.[87] Relationship Researchers Interest Group (RRIG)[edit] RRIG plans the Close Relationships Pre-Conference at the annual Society for Personality and Social Psychology (SPSP) Conference.[88] The group is made up of primarily psychologists who study and understand close and intimate relationships from a social psychology lens.[88] Close Relationships Pre-Conference at the SPSP Conference[edit] The Close Relationships Pre-Conference is where relationship scientists come together to discuss and present developing research on close and intimate relationships.[88] Here, the RRIG presents the Caryl Rusbult Early Career Award (formerly known as the "Early Career Award") as well as the Graduate Student Research Paper Award.[88] National Council on Family Relations (NCFR)[edit] Founded in 1938, NCFR is an international professional organization dedicated to research, practice, and education specifically in the domain of family science.[5] Its members are of various professional backgrounds (e.g., psychologists, sociologists, anthropologists, and therapists) with a common goal of improving family well-being.[5] Couples Special Interest Group[edit] The Couples Special Interest Group is a group within the Association for Behavioral and Cognitive Therapies (ABCT).[89] The group is made up of primarily researchers and clinical psychologists who study close and intimate relationships from a cognitive-behavioral lens.[89] A primary goal of this group is to develop evidence-based interventions to improve relationship well-being.[89] See also[edit] Aristotle Plato Stanley Schachter Harold Kelley John Bowlby Urie Bronfenbrenner Ellen Berscheid Elaine Hatfield Caryl Rusbult David A. Kenny Mary Ainsworth Harry Harlow Robert Hinde Psychology Anthropology Economics Sociology Biology Social psychology Clinical psychology Developmental psychology Cognitive psychology Cognitive behavioral therapy Family therapy Systems ecology Social ecological model Social exchange theory Social learning theory Attachment theory Human mating strategies Strategic pluralism Social connection Human bonding Physical intimacy Emotional intimacy Social relationships Interpersonal relationships Interpersonal ties Friendship Family Parenting Sibling relationship Love Platonic love Intimate relationship Romance Marriage Dating References[edit] ^ a b c d e Finkel, E. & Simpson, J. (2015). "Editorial overview: Relationship science". Current Opinion in Psychology. Relationship science. 1: 5–9. doi:10.1016/j.copsyc.2015.01.012. ISSN 2352-250X.CS1 maint: multiple names: authors list (link) ^ a b c d e f g h i j Finkel, Eli J.; Simpson, Jeffry A.; Eastwick, Paul W. (2017-01-03). "The Psychology of Close Relationships: Fourteen Core Principles". Annual Review of Psychology. 68 (1): 383–411. doi:10.1146/annurev-psych-010416-044038. ISSN 0066-4308. PMID 27618945. S2CID 207567096. ^ a b c Reis, H., Collins, A., & Berscheid, E. (2000). "The relationship context of human behavior and development". Psychological Bulletin. 126 (6): 844–872. CiteSeerX 10.1.1.727.1006. doi:10.1037/0033-2909.126.6.844. PMID 11107879.CS1 maint: multiple names: authors list (link) ^ a b c d Gottman, John Mordechai (February 1998). "Psychology and the Study of Marital Processes". Annual Review of Psychology. 49 (1): 169–197. doi:10.1146/annurev.psych.49.1.169. ISSN 0066-4308. PMID 15012468. ^ a b c "About Us | National Council on Family Relations". www.ncfr.org. Retrieved 2020-11-28. ^ a b c d "Journal of Marriage and Family | National Council on Family Relations". www.ncfr.org. Retrieved 2020-11-28. ^ Bretherton, I (1992). "The origins of attachment theory: John Bowlby and Mary Ainsworth". Developmental Psychology. 28 (5): 759–775. doi:10.1037/0012-1649.28.5.759 – via APA PsycNet. ^ a b c d Hill, R (1949). Families Under Stress. New York: Harper & Row. ^ Schachter, S. (1959). The psychology of affiliation: Experimental studies of the sources of gregariousness. Stanford Univer. Press. ^ a b c d e Thibaut, J. W., & Kelley, H. H. (1959). The social psychology of groups. John Wiley. ^ a b c d e f g h i j k l Reis, H. T., Aron, A., Clark, M. S., & Finkel, E. J. (2013). Ellen Berscheid, Elaine Hatfield, and the Emergence of Relationship Science. Perspectives on Psychological Science, 8(5), 558–572. https://doi.org/10.1177/1745691613497966 ^ Walster, E., Aronson, V., Abrahams, D., & Rottman, L. (1966). Importance of physical attractiveness in dating behavior. Journal of Personality and Social Psychology, 4(5), 508–516. https://doi.org/10.1037/h0021188 ^ Berscheid, E. & Hatfield Walster, E. (1969). Interpersonal Attraction. Reading, Massachusetts, Menlo Park, California - London - Don Mills, Ontario: Addison-Wesley Publishing Company.CS1 maint: multiple names: authors list (link) ^ Dion, K., Berscheid, E., & Walster, E. (1972). What is beautiful is good. Journal of Personality and Social Psychology, 24(3), 285–290. https://doi.org/10.1037/h0033731 ^ Hatfield, E. & Sprecher, S. (1986). "Measuring passionate love in intimate relationships". Journal of Adolescence. 9 (4): 383–410. doi:10.1016/S0140-1971(86)80043-4. PMID 3805440.CS1 maint: multiple names: authors list (link) ^ Hatfield E. (1982) Passionate Love, Companionate Love, and Intimacy. In: Fischer M., Stricker G. (eds) Intimacy. Springer, Boston, MA. https://doi.org/10.1007/978-1-4684-4160-4_17 ^ a b c d e f g Bronfenbrenner, U. (1977). Toward an experimental ecology of human development. American Psychologist, 32(7), 513–531. https://doi.org/10.1037/0003-066X.32.7.513 ^ a b Bronfenbrenner, U. (1979).The ecology of human development. Cambridge, MA: Harvard University Press. ^ Brendtro, L. (2006). "The Vision of Urie Bronfenbrenner: Adults Who Are Crazy About Kids". Reclaiming Children and Youth. 15 (3): 162–166. ^ a b c d e f g h i j k l m n o p q r s t u v w x y z aa ab ac ad ae af ag ah ai aj ak Bradbury, T. & Karney, B. (2019). Intimate Relationships (3rd ed.). Norton.CS1 maint: multiple names: authors list (link) ^ Spanier, G. (1976). Measuring Dyadic Adjustment: New Scales for Assessing the Quality of Marriage and Similar Dyads. Journal of Marriage and Family, 38(1), 15-28. doi:10.2307/350547 ^ a b c Bowlby, J. (1969). Atachment and Loss, Volume I: Attachment (2 ed.). Basic Books. ^ a b Bowlby, J. (1973). Attachment and Loss, Volume 2: Separation, Anxiety, and Anger. Basic Books. ^ a b Bowlby, J. (1980). Attachment and Loss, Volume III: Loss, Sadness, and Depression. Basic Books. ^ a b c d e Kelley, H.H., Berscheid, E., Christensen, A., Harvey, J.H., Huston, T.L., Levinger, G., McClintock, E., Peplau, L.A. & Peterson, D.R.. (1983) Close Relationships. New York: W.H. Freeman. ^ Toni C. Antonucci, Hiroko Akiyama, Social Networks in Adult Life and a Preliminary Examination of the Convoy Model, Journal of Gerontology, Volume 42, Issue 5, September 1987, Pages 519–527, https://doi.org/10.1093/geronj/42.5.519 ^ Aron, A., & Aron, E. N. (1986). Love and the expansion of self: Understanding attraction and satisfaction. Hemisphere Publishing Corp/Harper & Row Publishers. ^ Malloy, T.E. and Kenny, D.A. (1986), The Social Relations Model: An integrative method for personality research. Journal of Personality, 54: 199-225. https://doi.org/10.1111/j.1467-6494.1986.tb00393.x ^ a b Kenny, D. A. (1996). Models of Non-Independence in Dyadic Research. Journal of Social and Personal Relationships, 13(2), 279–294. https://doi.org/10.1177/0265407596132007 ^ Markman, H. J., Floyd, F. J., Stanley, S. M., & Storaasli, R. D. (1988). Prevention of marital distress: A longitudinal investigation. Journal of Consulting and Clinical Psychology, 56(2), 210–217. https://doi.org/10.1037/0022-006X.56.2.210 ^ Floyd, F. J., Markman, H. J., Kelly, S., Blumberg, S. L., & Stanley, S. M. (1995). Preventive intervention and relationship enhancement. In N. S. Jacobson & A. S. Gurman (Eds.), Clinical handbook of couple therapy (p. 212–226). The Guilford Press. ^ a b c Duck, S. (2014). "On Iowa, Relationships, and Communication: A History of the Field of Personal Relationships". Iowa Journal of Communications. 46 (1): 5–15. ^ a b Perlman, Daniel; Duck, Steve; Hengstebeck, Natalie D. (2018), Vangelisti, Anita L.; Perlman, Daniel (eds.), "The Seven Seas of the Study of Personal Relationships Research: Historical and Recent Currents", The Cambridge Handbook of Personal Relationships, Cambridge Handbooks in Psychology (2 ed.), Cambridge: Cambridge University Press, pp. 9–27, ISBN 978-1-107-13026-5, retrieved 2020-11-28 ^ a b c d e f "A Brief History of ISSPR - International Association for Relationship". studylib.net. Retrieved 2020-11-28. ^ a b c d e f g h Berscheid, E. (1999). "The Greening of Relationship Science" (PDF). American Psychologist. 54 (4): 260–266. doi:10.1037/0003-066X.54.4.260. PMID 10217995. ^ a b c d e f g h i Reis, Harry. (2007). Steps toward the ripening of relationship science. Personal Relationships. 14. 1 - 23. 10.1111/j.1475-6811.2006.00139.x. ^ a b c Impett, E. A., & Muise, A. (2018). The sexing of relationship science: Impetus for the special issue on sex and relationships. Journal of Social and Personal Relationships, 35(4), 433–439. https://doi.org/10.1177/0265407517752277 ^ Collins, N. L., & Feeney, B. C. (2000). A safe haven: An attachment theory perspective on support seeking and caregiving in intimate relationships. Journal of Personality and Social Psychology, 78(6), 1053–1073. https://doi.org/10.1037/0022-3514.78.6.1053 ^ Reis, H. T., Sheldon, K. M., Gable, S. L., Roscoe, J., & Ryan, R. M. (2000). Daily Well-Being: The Role of Autonomy, Competence, and Relatedness. Personality and Social Psychology Bulletin, 26(4), 419–435. https://doi.org/10.1177/0146167200266002 ^ a b Repetti, R., Taylor, S., & Seaman, T. (2002). "Risky Families: Family Social Environments and the Mental and Physical Health of Offspring". Psychological Bulletin. 128 (2): 330–366. CiteSeerX 10.1.1.327.165. doi:10.1037/0033-2909.128.2.330. PMID 11931522.CS1 maint: multiple names: authors list (link) ^ a b c "IARR - About IARR". iarr.org. Retrieved 2020-11-28. ^ Bradbury, T. N. (2002). Invited Program Overview: Research on Relationships as a Prelude to Action. Journal of Social and Personal Relationships, 19(5), 571–599. https://doi.org/10.1177/0265407502195001 ^ Finkel, E. J., Eastwick, P. W., Karney, B. R., Reis, H. T., & Sprecher, S. (2012). Online Dating: A Critical Analysis From the Perspective of Psychological Science. Psychological Science in the Public Interest, 13(1), 3–66. https://doi.org/10.1177/1529100612436522 ^ a b c Clark, M. S., & Reis, H. T. (1988). Interpersonal processes in close relationships. Annual Review of Psychology, 39, 609–672. https://doi.org/10.1146/annurev.ps.39.020188.003141 ^ a b c d e Berscheid, E. (1994). "Interpersonal Relationships". Annual Review of Psychology. 45: 79–129. doi:10.1146/annurev.ps.45.020194.000455. ^ Reis, H. T., & Shaver, P. (1988). Intimacy as an interpersonal process. In S. Duck, D. F. Hay, S. E. Hobfoll, W. Ickes, & B. M. Montgomery (Eds.), Handbook of personal relationships: Theory, research and interventions (p. 367–389). John Wiley & Sons. ^ a b Emerson, Richard. (2003). Social Exchange Theory. Annual Review of Sociology. 2. 335-362. 10.1146/annurev.so.02.080176.002003. ^ Blau, Peter M. (1964). Exchange & Power in Social Life. Transaction. ISBN 9780887386282. ^ Kelley, H. (1979) Personal Relationships: Their Structures and Processes. Hillsdale, NJ: Erlbaum ^ a b Rusbult, C. E. (1980). Commitment and satisfaction in romantic associations: A test of the investment model. Journal of Experimental Social Psychology, 16(2), 172–186. https://doi.org/10.1016/0022-1031(80)90007-4 ^ Rusbult, C. E. (1983). A longitudinal test of the investment model: The development (and deterioration) of satisfaction and commitment in heterosexual involvements. Journal of Personality and Social Psychology, 45(1), 101–117. https://doi.org/10.1037/0022-3514.45.1.101 ^ Rusbult, C. E., Martz, J. M., & Agnew, C. R. (1998). The Investment Model Scale: Measuring commitment level, satisfaction level, quality of alternatives, and investment size. Personal Relationships, 5(4), 357–391. https://doi.org/10.1111/j.1475-6811.1998.tb00177.x ^ Hull, C. L. (1930). "Simple trial and error learning: A study in psychological theory". Psychological Review. 37 (3): 241–256. doi:10.1037/h0073614 ^ Skinner, B.F. (1948). Verbal Behavior. Harvard University Press. ^ Bandura, A. (1971). Social learning theory. New York: General Learning Press. ^ a b c Patterson, G.R. (1982). Coercive Family Process. Eugene, OR. ^ a b Hazan C. & Shaver P. (1987) Romantic love conceptualized as an attachment process. Journal of Personality and Social Psychology. 52:511–24 ^ a b Collins, N. L., & Read, S. J. (1990). Adult attachment, working models, and relationship quality in dating couples. Journal of Personality and Social Psychology, 58(4), 644–663. https://doi.org/10.1037/0022-3514.58.4.644 ^ Simpson, J. A. (1990). Influence of attachment styles on romantic relationships. Journal of Personality and Social Psychology, 59(5), 971–980. https://doi.org/10.1037/0022-3514.59.5.971 ^ Simpson, J. A., Rholes, W. S., & Nelligan, J. S. (1992). Support seeking and support giving within couples in an anxiety-provoking situation: The role of attachment styles. Journal of Personality and Social Psychology, 62(3), 434–446. https://doi.org/10.1037/0022-3514.62.3.434 ^ a b c Fraley, R. C., Waller, N. G., & Brennan, K. A. (2000). An item response theory analysis of self-report measures of adult attachment. Journal of Personality and Social Psychology, 78(2), 350–365. https://doi.org/10.1037/0022-3514.78.2.350 ^ Darwin, C. (1874). The Descent of Man and Selection in Relation to Sex (2nd ed.). New York: Rand McNally. ^ Gangestad, S., & Haselton, M. (2015). Human estrus: implications for relationship science. Current opinion in psychology, 1, 45-51. ^ Buss, D. M. (1989). Sex differences in human mate preferences: Evolutionary hypotheses tested in 37 cultures. Behavioral and Brain Sciences, 12(1), 1–49. https://doi.org/10.1017/S0140525X00023992 ^ Buss, D. M., Larsen, R. J., Westen, D., & Semmelroth, J. (1992). Sex Differences in Jealousy: Evolution, Physiology, and Psychology. Psychological Science, 3(4), 251–256. https://doi.org/10.1111/j.1467-9280.1992.tb00038.x ^ Gangestad, S. & Simpson, J. (2000). The evolution of human mating: Trade-offs and strategic pluralism. The Behavioral and brain sciences. 23. 573-87; discussion 587. 10.1017/S0140525?0000337X. ^ McCubbin, H. I., & Patterson, J. M. (1983). The Family Stress Process: The Double ABCX Model of adjustment and adaptation. Marriage & Family Review, 6(1-2), 7–37. https://doi.org/10.1300/J002v06n01_02 ^ Bradbury, T. & Karney, B. (2019). Intimate Relationships(3rd ed.). Norton. ^ McCubbin, H. I., & Patterson, J. M. (1983). The Family Stress Process: The Double ABCX Model of adjustment and adaptation. Marriage & Family Review, 6(1-2), 7–37. https://doi.org/10.1300/J002v06n01_02 ^ Bronfenbrenner, U. (1986). Ecology of the family as a context for human development: Research perspectives. Developmental Psychology, 22(6), 723–742. https://doi.org/10.1037/0012-1649.22.6.723 ^ a b c d Silbereisen, R.K., Eyferth, K., & Rudinger, G. (1986). Development as Action in Context. Berlin Heidelberg New York Tokyo: Springer-Verlag Berlin Heidelberg.CS1 maint: multiple names: authors list (link) ^ a b c d e f Karney, B. R., & Bradbury, T. N. (1995). The longitudinal course of marital quality and stability: A review of theory, methods, and research. Psychological Bulletin, 118(1), 3–34. https://doi.org/10.1037/0033-2909.118.1.3 ^ a b Karney, B. R., & Bradbury, T. N. (1995). The longitudinal course of marital quality and stability: A review of theory, methods, and research. Psychological Bulletin, 118(1), 3–34. https://doi.org/10.1037/0033-2909.118.1.3 ^ a b c d e f Kenny, D. A., Kashy, D. A., Cook, W. L., & Simpson, J. A. (2020). Dyadic Data Analysis. Guilford Publications. https://books.google.com/books?id=tO4CEAAAQBAJ ^ a b c d e f g h Finkel, E., Eastwick, P.W., & Reis, H. (2015). Best research practices in psychology: Illustrating epistemological and pragmatic considerations with the case of relationship science. Journal of personality and social psychology, 108 2, 275-97. ^ a b c Karney, B. R. & Bradbury, T. N. (2020). Research on Marital Satisfaction and Stability in the 2010s: Challenging Conventional Wisdom. Journal of Marriage and Family. 82. 100-116. 10.1111/jomf.12635. ^ a b c Kenny, D. (1996). "Models of non-independence in dyadic research". Journal of Social and Personal Relationships. 13(2): 279–294. ^ a b c Iida, M., Seidman, G., & Shrout, P. (2018). "Models of interdependent individuals versus dyadic processes in relationship research". Journal of Social and Personal Relationships. 35 (1): 59–88. ^ a b c d e f g h i j k Kenny, D. (1996). "Models of non-independence in dyadic research". Journal of Social and Personal Relationships. 13 (2): 279–294. doi:10.1177/0265407596132007. S2CID 145275482. ^ a b c d e f g h i Iida, M., Seidman, G., & Shrout, P. (2018). "Models of interdependent individuals versus dyadic processes in relationship research". Journal of Social and Personal Relationships. 35 (1): 59–88. doi:10.1177/0265407517725407. S2CID 149317632.CS1 maint: multiple names: authors list (link) ^ a b "Personal Relationships". Wiley Online Library. Retrieved 2020-11-28. ^ "Journal of Marriage and Family on JSTOR". www.jstor.org. Retrieved 2020-11-28. ^ a b c "Journal of Family Psychology". www.apa.org. Retrieved 2020-11-28. ^ a b "Journal Description: Journal of Social and Personal Relationships". SAGE Journals. Retrieved 2020-11-28. ^ "Journal of Social and Personal Relationships". SAGE Publications Inc. 2015-10-28. Retrieved 2020-11-28. ^ a b "International Association for Relationship Research | UIA Yearbook Profile | Union of International Associations". uia.org. Retrieved 2020-11-28. ^ "IARR - Awards". iarr.org. Retrieved 2020-11-28. ^ a b c d "Close Relationships | SPSP Meetings". meeting.spsp.org. Retrieved 2020-11-28. ^ a b c Group, ABCT Couples Special Interest. "COUPLES SPECIAL INTEREST GROUP". ABCT Couples Special Interest Group. Retrieved 2020-11-28. 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