The convergence hypothesis suggests that spouses and romantic partners tend to become more alike over time due to their shared environment, repeated interactions, and synchronized routines. For example, partners who often laugh and joke with each other, may experience less stress, which, over the years, may improve their health and social interactions. Yet, as detailed below, this hypothesis was not confirmed by empirical studies.
The convergence hypothesis became popular among social scientists and was widely used to explain the high levels of observed similarity between spouses and romantic partners in physical, physiological, demographic and psychological characteristics, such as social class, religion, be of similar height, intelligence, education. Yet, empirical research shows that couples do not become more similar over time, but are similar from the outset. The similarity between spouses and romantic partners is explained by homogamy, (i.e., being socially and geographically surrounded by similar others) and homophily (i.e., preference for similar others).
The study by Zajonc et al. [1] found that the faces of spouses become more similar over time and that this similarity is positively correlated with couples' satisfaction in their marriage. The researchers suggest that this may be due to couples sharing similar environments and experiences, leading to similar facial features as a result. For example, couples who smile frequently may develop similar wrinkles around their eyes as a result.
More recent studies have called into question the hypothesis that spouses' faces become more similar over time, as suggested by Zajonc, et al [1] For example, Stanford University psychologists, Tea-makorn and Kosinski conducted a study on a sample of 517 married couples using photographs taken at the beginning of their marriages and 20 to 69 years later. They used two independent approaches to measure the similarity of the spouses’ faces: human judges and a modern facial recognition algorithm. Their findings demonstrated that while spouses have similar facial features at the start of their marriage, these features do not continue to become more alike over time. [2]
Hinsz [3] found that couples married for 25 years were no more similar in appearance than recently engaged couples. Additionally, Griffith and Kunz [4] found that while student raters were able to match spouses' faces at a level above chance, there was no significant trend of spouses growing to look alike as they lived together.
Research carried out by psychologists from the Michigan State University, and the University of Minnesota M. Brent Donnellan Mikhila N. Humbad, William G. Iacono, Matthew McGue and S. Alexandra Burt [5] based on a database of 1,296 couples who have been married for an average of 19.8 years, suggested that only the degree of aggressivity actually tended to converge.They also found that that couples who had been married for up to 39 years were no more alike in fundamental traits than newlyweds. They concluded that personalities do not grow more similar as years pass. The couples were more likely looking for specific traits during the courtship period and ended up with persons similar to themselves.
Common-law marriage, also known as non-ceremonial marriage, sui iuris marriage, informal marriage, de facto marriage, or marriage by habit and repute, is a marriage that results from the parties' agreement to consider themselves married and subsequent cohabitation, rather than through a statutorily defined process. Not all jurisdictions permit common law marriage, but will typically respect the validity of such a marriage lawfully entered in another state or country.
A facial expression is one or more motions or positions of the muscles beneath the skin of the face. These movements convey the emotional state of an individual to observers. Facial expressions are a form of nonverbal communication. They are a primary means of conveying social information between humans, but they also occur in most other mammals and some other animal species.
Infidelity is a violation of a couple's emotional or sexual exclusivity that commonly results in feelings of anger, sexual jealousy, and rivalry.
Open marriage is a form of non-monogamy in which the partners of a dyadic marriage agree that each may engage in extramarital sexual or romantic relationships, without this being regarded by them as infidelity, and consider or establish an open relationship despite the implied monogamy of marriage. There are variant forms of open marriage such as swinging and polyamory, each with the partners having varying levels of input into their spouse's activities.
The mere-exposure effect is a psychological phenomenon by which people tend to develop liking or disliking for things merely because they are familiar with them. In social psychology, this effect is sometimes called the familiarity principle. The effect has been demonstrated with many kinds of things, including words, Chinese characters, paintings, pictures of faces, geometric figures, and sounds. In studies of interpersonal attraction, the more often people see a person, the more pleasing and likeable they find that person.
Interpersonal attraction, as a part of social psychology, is the study of the attraction between people which leads to the development of platonic or romantic relationships. It is distinct from perceptions such as physical attractiveness, and involves views of what is and what is not considered beautiful or attractive.
Physical attractiveness is the degree to which a person's physical features are considered aesthetically pleasing or beautiful. The term often implies sexual attractiveness or desirability, but can also be distinct from either. There are many factors which influence one person's attraction to another, with physical aspects being one of them. Physical attraction itself includes universal perceptions common to all human cultures such as facial symmetry, sociocultural dependent attributes, and personal preferences unique to a particular individual.
Assortative mating is a mating pattern and a form of sexual selection in which individuals with similar phenotypes or genotypes mate with one another more frequently than would be expected under a random mating pattern.
Robert Bolesław Zajonc was a Polish-born American social psychologist who is known for his decades of work on a wide range of social and cognitive processes. One of his most important contributions to social psychology is the mere-exposure effect. Zajonc also conducted research in the areas of social facilitation, and theories of emotion, such as the affective neuroscience hypothesis.
A frown is a facial expression in which the eyebrows are brought together, and the forehead is wrinkled, usually indicating displeasure, sadness or worry, or less often confusion or concentration. The appearance of a frown varies by culture. An alternative usage in North America is thought of as an expression of the mouth. In those cases when used iconically, as with an emoticon, it is entirely presented by the curve of the lips forming a down-open curve. The mouth expression is also commonly referred to in the colloquial English phrase, especially in the United States, to "turn that frown upside down" which indicates changing from sad to happy.
The facial feedback hypothesis, rooted in the conjectures of Charles Darwin and William James, is that one's facial expression directly affects their emotional experience. Specifically, physiological activation of the facial regions associated with certain emotions holds a direct effect on the elicitation of such emotional states, and the lack of or inhibition of facial activation will result in the suppression of corresponding emotional states.
The cross-race effect is the tendency to more easily recognize faces that belong to one's own racial group, or racial groups that one has been in contact with. In social psychology, the cross-race effect is described as the "ingroup advantage," whereas in other fields, the effect can be seen as a specific form of the "ingroup advantage" since it is only applied in interracial or inter-ethnic situations. The cross-race effect is thought to contribute to difficulties in cross-race identification, as well as implicit racial bias.
In sexual relationships, concepts of age disparity, including what defines an age disparity, have developed over time and vary among societies. Differences in age preferences for mates can stem from partner availability, gender roles, and evolutionary mating strategies, and age preferences in sexual partners may vary cross-culturally. There are also social theories for age differences in relationships as well as suggested reasons for 'alternative' age-hypogamous relationships. Age-disparate relationships have been documented for most of recorded history and have been regarded with a wide range of attitudes dependent on sociocultural norms and legal systems.
Heterophily, or love of the different, is the tendency of individuals to collect in diverse groups; it is the opposite of homophily. This phenomenon can be seen in relationships between individuals. As a result, it can be analyzed in the workplace to create a more efficient and innovative workplace. It has also become an area of social network analysis.
The study of the evolution of emotions dates back to the 19th century. Evolution and natural selection has been applied to the study of human communication, mainly by Charles Darwin in his 1872 work, The Expression of the Emotions in Man and Animals. Darwin researched the expression of emotions in an effort to support his materialist theory of unguided evolution. He proposed that much like other traits found in animals, emotions apparently also evolved and were adapted over time. His work looked at not only facial expressions in animals and specifically humans, but attempted to point out parallels between behaviors in humans and other animals.
Filter theory is a sociological theory concerning dating and mate selection. It proposes that social structure limits the number of eligible candidates for a mate. Most often, this takes place due to homogamy, as people seek to date and marry only those similar to them. Homogamy is the idea of marriage between spouses who share similar characteristics, where heterogamy denotes marriage between spouses of different characteristics. The idea of "opposites attract” is heterogamous, as well as the idea that one spouse has complementing, not similar characteristics to the other.
Mate preferences in humans refers to why one human chooses or chooses not to mate with another human and their reasoning why. Men and women have been observed having different criteria as what makes a good or ideal mate. A potential mate's socioeconomic status has also been seen important, especially in developing areas where social status is more emphasized.
Homogamy is marriage between individuals who are, in some culturally important way, similar to each other. It is a form of assortative mating. The union may be based on socioeconomic status, class, gender, caste, ethnicity, or religion, or age in the case of the so-called age homogamy.
Marriage and health are closely related. Married people experience lower morbidity and mortality across such diverse health threats as cancer, heart attacks, and surgery. There are gender differences in these effects which may be partially due to men's and women's relative status. Most research on marriage and health has focused on heterosexual couples, and more work is needed to clarify the health effects on same-sex marriage. Simply being married, as well as the quality of one's marriage, has been linked to diverse measures of health. Research has examined the social-cognitive, emotional, behavioral and biological processes involved in these links.
In humans, males and females differ in their strategies to acquire mates and focus on certain qualities. There are two main categories of strategies that both sexes utilize: short-term and long-term. Human mate choice, an aspect of sexual selection in humans, depends on a variety of factors, such as ecology, demography, access to resources, rank/social standing, genes, and parasite stress.