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Kory Floyd and Colter D. Ray

Affectionate communication comprises the verbal and nonverbal behaviors people use to express messages of love, appreciation, fondness, and commitment to others in close relationships. Like all interpersonal behaviors, affectionate communication has biological and physiological antecedents, consequences, and correlates, many of which have implications for physical health and wellness. Investigating these factors within a biological framework allows for the adjudication of influences beyond those attributable to the environment. In particular, there are observable genetic and neurological differences between individuals with a highly affectionate disposition and those less prone to communicating affection, suggesting that variance in the tendency to engage in affectionate behavior is not entirely the result of environmental influences such as enculturation, parenting, and media exposure. In addition, the expression of affection is associated with markers of immune system competence and appears to help the body to relax and remain calm. The biological effects of affectionate communication are perhaps most pronounced in situations involving either acute or chronic stress. Specifically, highly affectionate individuals are less likely than others to overreact physiologically to stress-inducing events. Whatever stress reaction they do mount is better regulated than among their less affectionate counterparts. Moreover, highly affectionate individuals—or simply those who receive expressions of affection prior to or immediately following a stressful situation—exhibit faster physiological recovery from their elevated stress. Perhaps unsurprisingly, therefore, being deprived of adequate affectionate communication is predictive of multiple physical and psychological detriments, including elevated stress and exacerbated depression, social and relational problems, insecure attachment, susceptibility to diagnosed anxiety and mood disorders, susceptibility to diagnosed secondary immune disorders, chronic pain, and sleep disturbances.


Kory Floyd and Benjamin E. Custer

Affectionate communication constitutes verbal behaviors (e.g., saying “I love you”), nonverbal gestures (e.g., hugging, handholding), and socially supportive behaviors (e.g., helping with a project) that humans employ to develop and maintain close relationships with others. In addition to its relational benefits, affectionate communication contributes to health and wellness for both senders and receivers. Affection exchange theory (AET) addresses the questions of why humans engage in affectionate communication and why diverse benefits are associated with such behaviors. A robust empirical literature supports AET’s contention that both expressing and receiving affectionate behavior are associated with physical and mental health benefits. Despite these contributions, however, some compelling questions about affectionate communication remain to be addressed, and AET can provide a useful framework for doing so.


Intergroup communication concerns the verbal and nonverbal interaction between individuals from different groups. Since about the 1980s, the social identity perspective (including social identity, self-categorization, ethnolinguistic vitality, and communication accommodation theories) has provided much impetus to research on intergroup communication. One way to advance intergroup communication research, then, is to expand the social identity perspective. Evolutionary psychology, a research program firmly rooted in natural selection theory and its modern synthesis, can help achieve this goal. For example, a functional analysis of language acquisition suggests—and research confirms—that language (similar to sex and age but not race) is a dedicated dimension of social categorization. This is first of all because language is localized, with signal regularities (e.g., grammar, syntax) being meaningful only to in-group members. Second, there is a critical window of language acquisition that typically closes at late adolescence, and one can almost never reach native-level proficiency if the person tries to learn a language beyond that window. Thus, two people are very likely to have grown up in the same place if they speak the same language with similar high levels of proficiency. Conversely, the lack of proficiency in speaking a language suggests that one does not have the same childhood experience as others and is thus an out-group member. Because ancestral humans had recurrent exposure to people speaking different languages (or variants of the same language) even given their limited travel ability, language-based categorization appears to be an evolved part of human nature. Evolutionary theories can also help renovate research on ethnolinguistic vitality and (non)accommodation. For example, an analysis of host-parasite coevolution suggests that maintaining and using one’s own language can help reduce the risk of contracting foreign diseases in places with high parasite stress. This is because out-group members are more likely than in-group members to carry diseases that one’s physiological immune system cannot tackle. Intergroup differentiation is thus needed more in places with higher parasite stress, and language (as noted) reliably marks group membership. It thus benefits people living in parasite-laden environments to stick to their own language, which helps them remain close to in-group members and away from out-group members. Research also shows that increases in perceived parasitic threats cause people higher in pathogen disgust sensitivity to perceive speakers with foreign accents as being more dissimilar to self. This enhanced perceived dissimilarity may cause non-accommodation or divergence in intergroup communication, resulting in negative language attitudes and even intergroup conflicts. These and many other areas of research uniquely identified by evolutionary approaches to intergroup communication research await further empirical tests.